166 lines
3.6 KiB
Python
166 lines
3.6 KiB
Python
import decimal
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import datetime
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from typing import Optional, List
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import redis
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from pydantic import ValidationError
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from redis_developer.orm import (
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RedisModel,
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Field,
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Relationship,
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)
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# Declarative model classes
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class BaseRedisModel(RedisModel):
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class Meta:
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database = redis.Redis(password="my-password", decode_responses=True)
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model_key_prefix = "redis-developer:"
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class Address(BaseRedisModel):
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address_line_1: str
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address_line_2: Optional[str]
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city: str
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country: str
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postal_code: str
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class Order(BaseRedisModel):
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total: decimal.Decimal
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currency: str
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created_on: datetime.datetime
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class Member(BaseRedisModel):
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first_name: str
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last_name: str
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email: str = Field(unique=True, index=True)
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join_date: datetime.date
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# Creates an embedded document: stored as hash fields or JSON document.
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address: Address
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# Creates a relationship to data in separate Hash or JSON documents.
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orders: Optional[List[Order]] = Relationship(back_populates='member')
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# Creates a self-relationship.
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recommended_by: Optional['Member'] = Relationship(back_populates='recommended')
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class Meta(BaseRedisModel.Meta):
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model_key_prefix = "member"
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primary_key_pattern = ""
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# Validation
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address = Address(
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address_line_1="1 Main St.",
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city="Happy Town",
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state="WY",
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postal_code=11111,
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country="USA"
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)
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# Raises ValidationError: last_name, address are required
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try:
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Member(
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first_name="Andrew",
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zipcode="97086",
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join_date=datetime.date.today()
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)
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except ValidationError as e:
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pass
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# Raises ValidationError: join_date is not a date
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try:
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Member(
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first_name="Andrew",
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last_name="Brookins",
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join_date="yesterday"
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)
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except ValidationError as e:
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pass
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# Passes validation
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member = Member(
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first_name="Andrew",
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last_name="Brookins",
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email="a@example.com",
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address=address,
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join_date=datetime.date.today()
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)
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exit()
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# Save a model instance to Redis
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address.save()
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address2 = Address.get(address.pk)
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assert address2 == address
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exit()
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# Save a model with relationships (TODO!)
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member.save()
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# Save many model instances to Redis
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today = datetime.date.today()
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members = [
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Member(
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first_name="Andrew",
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last_name="Brookins",
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email="a@example.com",
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address=address,
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join_date=today
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),
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Member(
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first_name="Kim",
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last_name="Brookins",
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email="k@example.com",
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address=address,
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join_date=today
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)
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]
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Member.add(members)
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# Get a model instance from Redis using the primary key.
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member = Member.get(1)
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# Update a model instance in Redis
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member.first_name = "Brian"
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member.last_name = "Sam-Bodden"
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member.save()
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# Or, with an implicit save:
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member.update(first_name="Brian", last_name="Sam-Bodden")
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# Or, affecting multiple model instances with an implicit save:
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Member.filter(Member.last_name == "Brookins").update(last_name="Sam-Bodden")
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# Exact-value queries on indexed fields
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# What if the field wasn't unique and there were two "a@example.com"
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# entries? This would raise a MultipleObjectsReturned error:
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member = Member.get(Member.email == "a.m.brookins@gmail.com")
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# What if you know there might be multiple results? Use filter():
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members = Member.filter(Member.last_name == "Brookins")
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# What if you want to only return values that don't match a query?
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members = Member.exclude(Member.last_name == "Brookins")
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# You can combine filer() and exclude():
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members = Member.filter(Member.last_name == "Brookins").exclude(
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Member.first_name == "Andrew")
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