Django Cache Pydantic

Django Cache Pydantic is a minimal wrapper around django cache framework which allows you to create pydantic instances directly inside your django project cache and retrieve them using a similar interface to django orm.

Status

Dependencies

• Pydantic >= 2.6
• Django >= 3.2

Install

pip install django-cache-pydantic

Usage

1. Edit settings.py and add django_cache_pydantic to your INSTALLED_APPS (also config CACHES setting).
2. Inherit your pydantic model from PydanticCachedModel.

from pydantic import Field, Optional
from datetime import datetime
from django_cache_pydantic import PydanticCachedModel


class Person(PydanticCachedModel):
    national_id: str = Field(max_length=10, pattern=r'^\d*$')
    first_name: Optional[str] = None
    last_name: Optional[str] = None
    mobile_number: str = Field(max_length=11, pattern=r'^\d*$')
    created_at: datetime = Field(default_factory=lambda: datetime.now())

    class CacheMeta:
        ttl = 5 * 60
        primary_key_field = 'national_id'

3. Create your model instance directly into the cache via calling to save method or object manager create method.

# some where in your views
person = Person(national_id='123456789', mobile_number='0930444444')
person.save()  # will save the instance into project default cache

# some where in your views
Person.objects.create(national_id='123456789', mobile_number='0930444444')  # will save the instance into project default cache

4. Retrieve your model instance from the cache via calling to object manager get method.

# some where in your views
person = Person.objects.get(pk='123456789')
if person is not None:
    # do some stuff

Cache pydantic meta class

• You can control cache pydantic models behavior using a custom meta class called CacheMeta.

class CacheMeta:
    cache_backend: str  # refers to a predefined cache settings
    ttl: int  # default timeout for instance to live in cache
    primary_key_field: str  # could be set to be used as cache key
    verbose: str  # verbose name of base model

Cache pydantic Project Settings

• Default cache to save pydantic models into.

CACHE_PYDANTIC_DEFAULT_CACHE

• Default time to live of the pydantic cached models.

CACHE_PYDANTIC_DEFAULT_TTL