Adds expire and test.

aredis_om/model/model.py

@@ -1130,6 +1130,15 @@ class RedisModel(BaseModel, abc.ABC, metaclass=ModelMeta):
     async def save(self, pipeline: Optional[Pipeline] = None) -> "RedisModel":
         raise NotImplementedError
 
+    async def expire(self, num_seconds: int, pipeline: Optional[Pipeline] = None):
+        if pipeline is None:
+            db = self.db()
+        else:
+            db = pipeline
+
+        # TODO: Wrap any Redis response errors in a custom exception?
+        await db.expire(self.make_primary_key(self.pk), num_seconds)
+
     @validator("pk", always=True, allow_reuse=True)
     def validate_pk(cls, v):
         if not v:

tests/test_hash_model.py

@@ -391,6 +391,24 @@ async def test_delete(m):
     assert response == 1
 
 
+@pytest.mark.asyncio
+async def test_expire(m):
+    member = m.Member(
+        first_name="Expire",
+        last_name="Test",
+        email="e@example.com",
+        join_date=today,
+        age=93,
+        bio="This is a test user for expiry",
+    )
+
+    await member.save()
+    await member.expire(60)
+
+    ttl = await m.Member.db().ttl(member.key())
+    assert ttl > 0
+
+
 def test_raises_error_with_embedded_models(m):
     class Address(m.BaseHashModel):
         address_line_1: str