django cacheable model

A cacheable model for django.

• A generic way of creating cache keys from Django model fields
• Retrieve django models from cache with field values (cache on the way if cache missed)
• Retrieve all the model instances (suitable for small set of models)
• Support for cache aliases

See usage example below

1. Install

pip install django_cacheable_model

2. Configuration

• DEFAULT_CACHE_ALIAS the default cache name to use from settings.CACHES. If not set default alias is name "default" and must be configured in CACHES.
• CACHE_SET_MANY_LIMIT is chunk size for calls to cache.set_many.
  when all_ins_from_cache brings in all entries from cache, it will set each object
  in chunks to control request size. Default is 5 i.e if there are 10 instances of a model
  from db this config will set each of the models to the cache in two groups of 5

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

CACHE_DEFAULT_ALIAS = 'example_cache_alias'
CACHE_SET_MANY_LIMIT = 10
CACHES = {
   ...,
    'example_cache_alias': {
        'BACKEND': 'django.core.cache.backends.memcached.PyMemcacheCache',
        'LOCATION': 'memcached:11211',
    },
    ...
}

3. Usage

See samples in example_django_project views.py and models.py.

3.1. Create a model that inherits from CacheableModel

class Question(CacheableModel):
    question_text = models.CharField(max_length=200)
    pub_date = models.DateTimeField('date published')


class Choice(CacheableModel):
    question = models.ForeignKey(Question, on_delete=models.CASCADE)
    choice_text = models.CharField(max_length=200)
    votes = models.IntegerField(default=0)

3.2. Use cache operations from django_cacheable_model.utils

from django_cacheable_model.utils import all_ins_from_cache, model_ins_from_cache

# Get all instances of model from cache (use for smaller set of models)
context['choices'] = all_ins_from_cache(Choice)

# Get all instances with select_related and order_by
choices = all_ins_from_cache(Choice,
                             select_related=('question',),
                             order_by_fields=('-id',))

# Get a single model. Note this method returns a list of matching objects
context['choice'] = model_ins_from_cache(Choice, {'id': 5})[-1]

4. License

Apache2 License