WIP on pagination, sorting all()/first() methods
This commit is contained in:
Andrew Brookins
parent
3ba45b7c87
commit
01cab5352b
4 changed files with 473 additions and 294 deletions
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@ -2,8 +2,8 @@ import abc
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import dataclasses
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import decimal
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import operator
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from copy import copy, deepcopy
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from dataclasses import dataclass
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import re
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from copy import deepcopy
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from enum import Enum
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from functools import reduce
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from typing import (
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@ -20,13 +20,15 @@ from typing import (
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Sequence,
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no_type_check,
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Protocol,
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List, Type
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List,
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Type,
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Pattern
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)
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import uuid
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import redis
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from pydantic import BaseModel, validator
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from pydantic.fields import FieldInfo as PydanticFieldInfo
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from pydantic.fields import FieldInfo as PydanticFieldInfo, PrivateAttr, Field
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from pydantic.fields import ModelField, Undefined, UndefinedType
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from pydantic.main import ModelMetaclass
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from pydantic.typing import NoArgAnyCallable
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@ -34,18 +36,47 @@ from pydantic.utils import Representation
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from .encoders import jsonable_encoder
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model_registry = {}
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_T = TypeVar("_T")
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class TokenEscaper:
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"""
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Escape punctuation within an input string.
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"""
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# Characters that RediSearch requires us to escape during queries.
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# Source: https://oss.redis.com/redisearch/Escaping/#the_rules_of_text_field_tokenization
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DEFAULT_ESCAPED_CHARS = r"[,.<>{}\[\]\\\"\':;!@#$%^&*()\-+=~\ ]"
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def __init__(self, escape_chars_re: Optional[Pattern] = None):
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if escape_chars_re:
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self.escaped_chars_re = escape_chars_re
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else:
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self.escaped_chars_re = re.compile(self.DEFAULT_ESCAPED_CHARS)
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def escape(self, string):
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def escape_symbol(match):
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value = match.group(0)
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return f"\\{value}"
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return self.escaped_chars_re.sub(escape_symbol, string)
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escaper = TokenEscaper()
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class RedisModelError(Exception):
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pass
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class NotFoundError(Exception):
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pass
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"""
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A query found no results.
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TODO: embed in Model class?
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"""
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class Operators(Enum):
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@ -61,9 +92,10 @@ class Operators(Enum):
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IN = 10
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NOT_IN = 11
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LIKE = 12
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ALL = 13
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@dataclass
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@dataclasses.dataclass
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class NegatedExpression:
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expression: 'Expression'
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@ -77,7 +109,7 @@ class NegatedExpression:
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return Expression(left=self, op=Operators.OR, right=other)
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@dataclass
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@dataclasses.dataclass
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class Expression:
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op: Operators
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left: Any
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@ -96,186 +128,6 @@ class Expression:
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ExpressionOrNegated = Union[Expression, NegatedExpression]
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class QueryNotSupportedError(Exception):
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"""The attempted query is not supported."""
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class RediSearchFieldTypes(Enum):
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TEXT = 'TEXT'
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TAG = 'TAG'
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NUMERIC = 'NUMERIC'
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GEO = 'GEO'
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# TODO: How to handle Geo fields?
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NUMERIC_TYPES = (float, int, decimal.Decimal)
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@dataclass
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class FindQuery:
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expressions: Sequence[Expression]
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expression: Expression = dataclasses.field(init=False)
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query: str = dataclasses.field(init=False)
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pagination: List[str] = dataclasses.field(init=False)
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model: Type['RedisModel']
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limit: Optional[int] = None
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offset: Optional[int] = None
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def __post_init__(self):
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self.expression = reduce(operator.and_, self.expressions)
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self.query = self.resolve_redisearch_query(self.expression)
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self.pagination = self.resolve_redisearch_pagination()
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def resolve_field_type(self, field: ModelField) -> RediSearchFieldTypes:
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if getattr(field.field_info, 'primary_key', None) is True:
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return RediSearchFieldTypes.TAG
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elif getattr(field.field_info, 'full_text_search', None) is True:
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return RediSearchFieldTypes.TEXT
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field_type = field.outer_type_
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# TODO: GEO
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if any(issubclass(field_type, t) for t in NUMERIC_TYPES):
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return RediSearchFieldTypes.NUMERIC
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else:
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# TAG fields are the default field type.
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return RediSearchFieldTypes.TAG
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@staticmethod
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def expand_tag_value(value):
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err = RedisModelError(f"Using the IN operator requires passing an iterable of "
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"possible values. You passed: {value}")
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if isinstance(str, value):
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raise err
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try:
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expanded_value = "|".join(value)
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except TypeError:
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raise err
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return expanded_value
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def resolve_value(self, field_name: str, field_type: RediSearchFieldTypes,
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op: Operators, value: Any) -> str:
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result = ""
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if field_type is RediSearchFieldTypes.TEXT:
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result = f"@{field_name}:"
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if op is Operators.EQ:
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result += f'"{value}"'
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elif op is Operators.NE:
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result = f'-({result}"{value}")'
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elif op is Operators.LIKE:
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result += value
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else:
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# TODO: Handling TAG, TEXT switch-offs, etc.
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raise QueryNotSupportedError("Only equals (=) and not-equals (!=) comparisons are "
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"currently supported for TEXT fields. See docs: TODO")
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elif field_type is RediSearchFieldTypes.NUMERIC:
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if op is Operators.EQ:
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result += f"@{field_name}:[{value} {value}]"
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elif op is Operators.NE:
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# TODO: Is this enough or do we also need a clause for all values
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# ([-inf +inf]) from which we then subtract the undesirable value?
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result += f"-(@{field_name}:[{value} {value}])"
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elif op is Operators.GT:
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result += f"@{field_name}:[({value} +inf]"
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elif op is Operators.LT:
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result += f"@{field_name}:[-inf ({value}]"
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elif op is Operators.GE:
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result += f"@{field_name}:[{value} +inf]"
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elif op is Operators.LE:
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result += f"@{field_name}:[-inf {value}]"
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elif field_type is RediSearchFieldTypes.TAG:
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if op is Operators.EQ:
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result += f"@{field_name}:{{{value}}}"
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elif op is Operators.NE:
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result += f"-(@{field_name}:{{{value}}})"
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elif op is Operators.IN:
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expanded_value = self.expand_tag_value(value)
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result += f"(@{field_name}:{{{expanded_value}}})"
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elif op is Operators.NOT_IN:
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expanded_value = self.expand_tag_value(value)
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result += f"-(@{field_name}:{{{expanded_value}}})"
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return result
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def resolve_redisearch_pagination(self):
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"""Resolve pagination options for a query."""
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if not self.limit and not self.offset:
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return []
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offset = self.offset or 0
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limit = self.limit or 10
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return ["LIMIT", offset, limit]
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def resolve_redisearch_query(self, expression: ExpressionOrNegated):
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"""Resolve an expression to a string RediSearch query."""
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field_type = None
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field_name = None
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encompassing_expression_is_negated = False
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result = ""
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if isinstance(expression, NegatedExpression):
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encompassing_expression_is_negated = True
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expression = expression.expression
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if isinstance(expression.left, Expression) or \
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isinstance(expression.left, NegatedExpression):
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result += f"({self.resolve_redisearch_query(expression.left)})"
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elif isinstance(expression.left, ModelField):
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field_type = self.resolve_field_type(expression.left)
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field_name = expression.left.name
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else:
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import ipdb; ipdb.set_trace()
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raise QueryNotSupportedError(f"A query expression should start with either a field "
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f"or an expression enclosed in parenthesis. See docs: "
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f"TODO")
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right = expression.right
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right_is_negated = isinstance(right, NegatedExpression)
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if isinstance(right, Expression) or right_is_negated:
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if expression.op == Operators.AND:
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result += " "
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elif expression.op == Operators.OR:
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result += "| "
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else:
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raise QueryNotSupportedError("You can only combine two query expressions with"
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"AND (&) or OR (|). See docs: TODO")
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if right_is_negated:
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result += "-"
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# We're handling the RediSearch operator in this call ("-"), so resolve the
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# inner expression instead of the NegatedExpression.
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right = right.expression
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result += f"({self.resolve_redisearch_query(right)})"
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else:
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if isinstance(right, ModelField):
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raise QueryNotSupportedError("Comparing fields is not supported. See docs: TODO")
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else:
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result += self.resolve_value(field_name, field_type, expression.op, right)
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if encompassing_expression_is_negated:
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result = f"-({result})"
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return result
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def find(self):
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args = ["ft.search", self.model.Meta.index_name, self.query]
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# TODO: Do we need self.pagination if we're just appending to query anyway?
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if self.pagination:
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args.extend(self.pagination)
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return self.model.db().execute_command(*args)
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class PrimaryKeyCreator(Protocol):
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def create_pk(self, *args, **kwargs) -> str:
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"""Create a new primary key"""
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class Uuid4PrimaryKey:
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def create_pk(self) -> str:
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return str(uuid.uuid4())
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class ExpressionProxy:
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def __init__(self, field: ModelField):
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self.field = field
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@ -299,6 +151,352 @@ class ExpressionProxy:
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return Expression(left=self.field, op=Operators.GE, right=other)
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class QueryNotSupportedError(Exception):
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"""The attempted query is not supported."""
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class RediSearchFieldTypes(Enum):
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TEXT = 'TEXT'
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TAG = 'TAG'
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NUMERIC = 'NUMERIC'
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GEO = 'GEO'
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# TODO: How to handle Geo fields?
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NUMERIC_TYPES = (float, int, decimal.Decimal)
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DEFAULT_PAGE_SIZE = 10
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class FindQuery(BaseModel):
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expressions: Sequence[ExpressionOrNegated]
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model: Type['RedisModel']
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offset: int = 0
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limit: int = DEFAULT_PAGE_SIZE
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page_size: int = DEFAULT_PAGE_SIZE
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sort_fields: Optional[List[str]] = Field(default_factory=list)
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_expression: Expression = PrivateAttr(default=None)
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_query: str = PrivateAttr(default=None)
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_pagination: List[str] = PrivateAttr(default_factory=list)
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_model_cache: Optional[List['RedisModel']] = PrivateAttr(default_factory=list)
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class Config:
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arbitrary_types_allowed = True
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@property
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def pagination(self):
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if self._pagination:
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return self._pagination
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self._pagination = self.resolve_redisearch_pagination()
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return self._pagination
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@property
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def expression(self):
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if self._expression:
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return self._expression
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if self.expressions:
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self._expression = reduce(operator.and_, self.expressions)
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else:
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self._expression = Expression(left=None, right=None, op=Operators.ALL)
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return self._expression
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@property
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def query(self):
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return self.resolve_redisearch_query(self.expression)
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@validator("sort_fields")
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def validate_sort_fields(cls, v, values):
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model = values['model']
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for sort_field in v:
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field_name = sort_field.lstrip("-")
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if field_name not in model.__fields__:
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raise QueryNotSupportedError(f"You tried sort by {field_name}, but that field "
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f"does not exist on the model {model}")
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field_proxy = getattr(model, field_name)
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if not getattr(field_proxy.field.field_info, 'sortable', False):
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raise QueryNotSupportedError(f"You tried sort by {field_name}, but {cls} does "
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"not define that field as sortable. See docs: XXX")
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return v
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@staticmethod
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def resolve_field_type(field: ModelField) -> RediSearchFieldTypes:
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if getattr(field.field_info, 'primary_key', None) is True:
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return RediSearchFieldTypes.TAG
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elif getattr(field.field_info, 'full_text_search', None) is True:
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return RediSearchFieldTypes.TEXT
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field_type = field.outer_type_
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# TODO: GEO
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if any(issubclass(field_type, t) for t in NUMERIC_TYPES):
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return RediSearchFieldTypes.NUMERIC
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else:
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# TAG fields are the default field type.
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# TODO: A ListField or ArrayField that supports multiple values
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# and contains logic.
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return RediSearchFieldTypes.TAG
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@staticmethod
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def expand_tag_value(value):
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err = RedisModelError(f"Using the IN operator requires passing a sequence of "
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"possible values. You passed: {value}")
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if isinstance(str, value):
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raise err
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try:
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expanded_value = "|".join([escaper.escape(v) for v in value])
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except TypeError:
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raise err
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return expanded_value
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@classmethod
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def resolve_value(cls, field_name: str, field_type: RediSearchFieldTypes,
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op: Operators, value: Any) -> str:
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result = ""
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if field_type is RediSearchFieldTypes.TEXT:
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result = f"@{field_name}:"
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if op is Operators.EQ:
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result += f'"{value}"'
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elif op is Operators.NE:
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result = f'-({result}"{value}")'
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elif op is Operators.LIKE:
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result += value
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else:
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raise QueryNotSupportedError("Only equals (=), not-equals (!=), and like() "
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"comparisons are supported for TEXT fields. See "
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"docs: TODO.")
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elif field_type is RediSearchFieldTypes.NUMERIC:
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if op is Operators.EQ:
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result += f"@{field_name}:[{value} {value}]"
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elif op is Operators.NE:
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# TODO: Is this enough or do we also need a clause for all values
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# ([-inf +inf]) from which we then subtract the undesirable value?
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result += f"-(@{field_name}:[{value} {value}])"
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elif op is Operators.GT:
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result += f"@{field_name}:[({value} +inf]"
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elif op is Operators.LT:
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result += f"@{field_name}:[-inf ({value}]"
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elif op is Operators.GE:
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result += f"@{field_name}:[{value} +inf]"
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elif op is Operators.LE:
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result += f"@{field_name}:[-inf {value}]"
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elif field_type is RediSearchFieldTypes.TAG:
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if op is Operators.EQ:
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value = escaper.escape(value)
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result += f"@{field_name}:{{{value}}}"
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elif op is Operators.NE:
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value = escaper.escape(value)
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result += f"-(@{field_name}:{{{value}}})"
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elif op is Operators.IN:
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expanded_value = cls.expand_tag_value(value)
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result += f"(@{field_name}:{{{expanded_value}}})"
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elif op is Operators.NOT_IN:
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expanded_value = cls.expand_tag_value(value)
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result += f"-(@{field_name}:{{{expanded_value}}})"
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return result
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def resolve_redisearch_pagination(self):
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"""Resolve pagination options for a query."""
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return ["LIMIT", self.offset, self.limit]
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def resolve_redisearch_sort_fields(self):
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"""Resolve sort options for a query."""
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if not self.sort_fields:
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return
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fields = []
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for f in self.sort_fields:
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direction = "desc" if f.startswith('-') else 'asc'
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fields.extend([f.lstrip('-'), direction])
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if self.sort_fields:
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return ["SORTBY", *fields]
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@classmethod
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def resolve_redisearch_query(cls, expression: ExpressionOrNegated):
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"""Resolve an expression to a string RediSearch query."""
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field_type = None
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field_name = None
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encompassing_expression_is_negated = False
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result = ""
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if isinstance(expression, NegatedExpression):
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encompassing_expression_is_negated = True
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expression = expression.expression
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if expression.op is Operators.ALL:
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if encompassing_expression_is_negated:
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# TODO: Is there a use case for this, perhaps for dynamic
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# scoring purposes?
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raise QueryNotSupportedError("You cannot negate a query for all results.")
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return "*"
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if isinstance(expression.left, Expression) or \
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isinstance(expression.left, NegatedExpression):
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result += f"({cls.resolve_redisearch_query(expression.left)})"
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elif isinstance(expression.left, ModelField):
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field_type = cls.resolve_field_type(expression.left)
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field_name = expression.left.name
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else:
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import ipdb; ipdb.set_trace()
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raise QueryNotSupportedError(f"A query expression should start with either a field "
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f"or an expression enclosed in parenthesis. See docs: "
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f"TODO")
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right = expression.right
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|
||||
if isinstance(right, Expression) or isinstance(right, NegatedExpression):
|
||||
if expression.op == Operators.AND:
|
||||
result += " "
|
||||
elif expression.op == Operators.OR:
|
||||
result += "| "
|
||||
else:
|
||||
raise QueryNotSupportedError("You can only combine two query expressions with"
|
||||
"AND (&) or OR (|). See docs: TODO")
|
||||
|
||||
if isinstance(right, NegatedExpression):
|
||||
result += "-"
|
||||
# We're handling the RediSearch operator in this call ("-"), so resolve the
|
||||
# inner expression instead of the NegatedExpression.
|
||||
right = right.expression
|
||||
|
||||
result += f"({cls.resolve_redisearch_query(right)})"
|
||||
else:
|
||||
if isinstance(right, ModelField):
|
||||
raise QueryNotSupportedError("Comparing fields is not supported. See docs: TODO")
|
||||
else:
|
||||
# TODO: Optionals causing IDE errors here
|
||||
result += cls.resolve_value(field_name, field_type, expression.op, right)
|
||||
|
||||
if encompassing_expression_is_negated:
|
||||
result = f"-({result})"
|
||||
|
||||
return result
|
||||
|
||||
def execute(self, exhaust_results=True):
|
||||
args = ["ft.search", self.model.Meta.index_name, self.query, *self.pagination]
|
||||
if self.sort_fields:
|
||||
args += self.resolve_redisearch_sort_fields()
|
||||
|
||||
# Reset the cache if we're executing from offset 0.
|
||||
if self.offset == 0:
|
||||
self._model_cache.clear()
|
||||
|
||||
# If the offset is greater than 0, we're paginating through a result set,
|
||||
# so append the new results to results already in the cache.
|
||||
raw_result = self.model.db().execute_command(*args)
|
||||
count = raw_result[0]
|
||||
results = self.model.from_redis(raw_result)
|
||||
self._model_cache += results
|
||||
|
||||
if not exhaust_results:
|
||||
return self._model_cache
|
||||
|
||||
# The query returned all results, so we have no more work to do.
|
||||
if count <= len(results):
|
||||
return self._model_cache
|
||||
|
||||
# Transparently (to the user) make subsequent requests to paginate
|
||||
# through the results and finally return them all.
|
||||
query = self
|
||||
while True:
|
||||
# Make a query for each pass of the loop, with a new offset equal to the
|
||||
# current offset plus `page_size`, until we stop getting results back.
|
||||
query = FindQuery(expressions=query.expressions,
|
||||
model=query.model,
|
||||
offset=query.offset + query.page_size,
|
||||
page_size=query.page_size,
|
||||
limit=query.limit)
|
||||
_results = query.execute(exhaust_results=False)
|
||||
if not _results:
|
||||
break
|
||||
self._model_cache += _results
|
||||
return self._model_cache
|
||||
|
||||
def first(self):
|
||||
query = FindQuery(expressions=self.expressions, model=self.model,
|
||||
offset=0, limit=1, sort_fields=self.sort_fields)
|
||||
return query.execute()[0]
|
||||
|
||||
def all(self, batch_size=10):
|
||||
if batch_size != self.page_size:
|
||||
# TODO: There's probably a copy-with-change mechanism in Pydantic,
|
||||
# or can we use one from dataclasses?
|
||||
query = FindQuery(expressions=self.expressions,
|
||||
model=self.model,
|
||||
offset=self.offset,
|
||||
page_size=batch_size,
|
||||
limit=batch_size,
|
||||
sort_fields=self.sort_fields)
|
||||
return query.execute()
|
||||
return self.execute()
|
||||
|
||||
def sort_by(self, *fields):
|
||||
if not fields:
|
||||
return self
|
||||
return FindQuery(expressions=self.expressions,
|
||||
model=self.model,
|
||||
offset=self.offset,
|
||||
page_size=self.page_size,
|
||||
limit=self.limit,
|
||||
sort_fields=list(fields))
|
||||
|
||||
def update(self, **kwargs):
|
||||
"""Update all matching records in this query."""
|
||||
# TODO
|
||||
|
||||
def delete(cls, **field_values):
|
||||
"""Delete all matching records in this query."""
|
||||
for field_name, value in field_values:
|
||||
valid_attr = hasattr(cls.model, field_name)
|
||||
if not valid_attr:
|
||||
raise RedisModelError(f"Can't update field {field_name} because "
|
||||
f"the field does not exist on the model {cls}")
|
||||
|
||||
return cls
|
||||
|
||||
def __iter__(self):
|
||||
if self._model_cache:
|
||||
for m in self._model_cache:
|
||||
yield m
|
||||
else:
|
||||
for m in self.execute():
|
||||
yield m
|
||||
|
||||
def __getitem__(self, item: int):
|
||||
"""
|
||||
Given this code:
|
||||
Model.find()[1000]
|
||||
|
||||
We should return only the 1000th result.
|
||||
|
||||
1. If the result is loaded in the query cache for this query,
|
||||
we can return it directly from the cache.
|
||||
|
||||
2. If the query cache does not have enough elements to return
|
||||
that result, then we should clone the current query and
|
||||
give it a new offset and limit: offset=n, limit=1.
|
||||
"""
|
||||
if self._model_cache and len(self._model_cache) >= item:
|
||||
return self._model_cache[item]
|
||||
|
||||
query = FindQuery(expressions=self.expressions,
|
||||
model=self.model,
|
||||
offset=item,
|
||||
sort_fields=self.sort_fields,
|
||||
limit=1)
|
||||
|
||||
return query.execute()[0]
|
||||
|
||||
|
||||
class PrimaryKeyCreator(Protocol):
|
||||
def create_pk(self, *args, **kwargs) -> str:
|
||||
"""Create a new primary key"""
|
||||
|
||||
|
||||
class Uuid4PrimaryKey:
|
||||
def create_pk(self, *args, **kwargs) -> str:
|
||||
return str(uuid.uuid4())
|
||||
|
||||
|
||||
def __dataclass_transform__(
|
||||
*,
|
||||
eq_default: bool = True,
|
||||
|
|
@ -395,21 +593,22 @@ def Field(
|
|||
return field_info
|
||||
|
||||
|
||||
@dataclass
|
||||
@dataclasses.dataclass
|
||||
class PrimaryKey:
|
||||
name: str
|
||||
field: ModelField
|
||||
|
||||
|
||||
class DefaultMeta:
|
||||
# TODO: Should this really be optional here?
|
||||
global_key_prefix: Optional[str] = None
|
||||
model_key_prefix: Optional[str] = None
|
||||
primary_key_pattern: Optional[str] = None
|
||||
database: Optional[redis.Redis] = None
|
||||
primary_key: Optional[PrimaryKey] = None
|
||||
primary_key_creator_cls: Type[PrimaryKeyCreator] = None
|
||||
index_name: str = None
|
||||
abstract: bool = False
|
||||
primary_key_creator_cls: Optional[Type[PrimaryKeyCreator]] = None
|
||||
index_name: Optional[str] = None
|
||||
abstract: Optional[bool] = False
|
||||
|
||||
|
||||
class ModelMeta(ModelMetaclass):
|
||||
|
|
@ -473,6 +672,7 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
pk: Optional[str] = Field(default=None, primary_key=True)
|
||||
|
||||
Meta = DefaultMeta
|
||||
# TODO: Missing _meta here is causing IDE warnings.
|
||||
|
||||
class Config:
|
||||
orm_mode = True
|
||||
|
|
@ -484,6 +684,7 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
__pydantic_self__.validate_primary_key()
|
||||
|
||||
def __lt__(self, other):
|
||||
"""Default sort: compare all shared model fields."""
|
||||
my_keys = set(self.__fields__.keys())
|
||||
other_keys = set(other.__fields__.keys())
|
||||
shared_keys = list(my_keys & other_keys)
|
||||
|
|
@ -528,8 +729,13 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
def db(cls):
|
||||
return cls._meta.database
|
||||
|
||||
@classmethod
|
||||
def find(cls, *expressions: Expression):
|
||||
return FindQuery(expressions=expressions, model=cls)
|
||||
|
||||
@classmethod
|
||||
def from_redis(cls, res: Any):
|
||||
# TODO: Parsing logic borrowed from redisearch-py. Evaluate.
|
||||
import six
|
||||
from six.moves import xrange, zip as izip
|
||||
|
||||
|
|
@ -537,20 +743,20 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
if isinstance(s, six.string_types):
|
||||
return s
|
||||
elif isinstance(s, six.binary_type):
|
||||
return s.decode('utf-8','ignore')
|
||||
return s.decode('utf-8', 'ignore')
|
||||
else:
|
||||
return s # Not a string we care about
|
||||
|
||||
docs = []
|
||||
step = 2 # Because the result has content
|
||||
offset = 1
|
||||
offset = 1 # The first item is the count of total matches.
|
||||
|
||||
for i in xrange(1, len(res), step):
|
||||
fields_offset = offset
|
||||
|
||||
fields = dict(
|
||||
dict(izip(map(to_string, res[i + fields_offset][::2]),
|
||||
map(to_string, res[i + fields_offset][1::2])))
|
||||
map(to_string, res[i + fields_offset][1::2])))
|
||||
)
|
||||
|
||||
try:
|
||||
|
|
@ -562,17 +768,6 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
docs.append(doc)
|
||||
return docs
|
||||
|
||||
@classmethod
|
||||
def find(cls, *expressions: Expression):
|
||||
query = FindQuery(expressions=expressions, model=cls)
|
||||
raw_result = query.find()
|
||||
return cls.from_redis(raw_result)
|
||||
|
||||
@classmethod
|
||||
def find_one(cls, *expressions: Expression):
|
||||
query = FindQuery(expressions=expressions, model=cls, limit=1, offset=0)
|
||||
raw_result = query.find()
|
||||
return cls.from_redis(raw_result)[0]
|
||||
|
||||
@classmethod
|
||||
def add(cls, models: Sequence['RedisModel']) -> Sequence['RedisModel']:
|
||||
|
|
@ -580,6 +775,7 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
|
|||
|
||||
@classmethod
|
||||
def update(cls, **field_values):
|
||||
"""Update this model instance."""
|
||||
return cls
|
||||
|
||||
@classmethod
|
||||
|
|
|
|||
|
|
@ -1,55 +0,0 @@
|
|||
from redis_developer.orm.model import Expression
|
||||
|
||||
|
||||
class QueryIterator:
|
||||
"""
|
||||
A lazy iterator that yields results from a RediSearch query.
|
||||
|
||||
Examples:
|
||||
|
||||
results = Model.filter(email == "a@example.com")
|
||||
|
||||
# Consume all results.
|
||||
for r in results:
|
||||
print(r)
|
||||
|
||||
# Consume an item at an index.
|
||||
print(results[100])
|
||||
|
||||
# Consume a slice.
|
||||
print(results[0:100])
|
||||
|
||||
# Alternative notation to consume all items.
|
||||
print(results[0:-1])
|
||||
|
||||
# Specify the batch size:
|
||||
results = Model.filter(email == "a@example.com", batch_size=1000)
|
||||
...
|
||||
"""
|
||||
def __init__(self, client, query, batch_size=100):
|
||||
self.client = client
|
||||
self.query = query
|
||||
self.batch_size = batch_size
|
||||
|
||||
def __iter__(self):
|
||||
pass
|
||||
|
||||
def __getattr__(self, item):
|
||||
"""Support getting a single value or a slice."""
|
||||
|
||||
# TODO: Query mixin?
|
||||
|
||||
def filter(self, *expressions: Expression):
|
||||
pass
|
||||
|
||||
def exclude(self, *expressions: Expression):
|
||||
pass
|
||||
|
||||
def and_(self, *expressions: Expression):
|
||||
pass
|
||||
|
||||
def or_(self, *expressions: Expression):
|
||||
pass
|
||||
|
||||
def not_(self, *expressions: Expression):
|
||||
pass
|
||||
Loading…
Add table
Add a link
Reference in a new issue