Metadata-Version: 2.1
Name: django-counter-cache-field
Version: 0.1.2
Summary: django-counter-cache-field makes it extremely easy to denormalize and keep track of related model counts.
Home-page: http://github.com/enjoy2000/django-counter-cache-field
Author: Hat Dao
Author-email: enjoy3013@gmail.com
License: MIT License
Description: ====================
        django-counter-field
        ====================
        .. image:: https://travis-ci.org/enjoy2000/django-counter-cache-field.svg?branch=master
            :target: https://travis-ci.org/enjoy2000/django-counter-cache-field
        
        
        It is sometimes useful to cache the total number of objects associated with another object through a ForeignKey
        relation. For example the total number of comments associated with an article.
        
        django-counter-field makes it easy to denormalize and keep such counters up to date.
        
        Quick start
        -----------
        
        1. Install django-counter-field::
        
            pip install django-counter-cache-field
        
        2. Add "django_counter_field" to your INSTALLED_APPS setting::
        
            INSTALLED_APPS = (
                ...
                'django_counter_cache_field',
            )
        
        3. Add a CounterCacheField to your model::
        
            from django_counter_field import CounterCacheField
        
        
            class Article(models.Model):
                comment_count = CounterCacheField()
        
        4. Connect the related foreign key field with the counter field in your signals::
        
            connect_counter('comment_count', Comment.article)
        
        Whenever a comment is created the comment_count on the associated Article will be incremented. If the comment is
        deleted, the comment_count will be automatically decremented.
        
        
        Overview
        --------
        
        Creating a new counter requires three simple steps:
        
        1. Add a `CounterCacheField` field to the parent model.
        2. Add the `CounterMixin` mixin to the child model.
        3. Use `connect_counter` to connect the child model with the new counter.
        
        Most counters are simple in the sense that you want to count all child objects. Sometimes, however, objects should be
        counted based on one or several conditions. For example you may not wish to count *all* comments on an article but
        only comments that have been approved. You can create conditional counters by providing a third `is_in_counter_func`
        argument to `connect_counter`:
        
            connect_counter('comment_count', Comment.article, lambda comment: comment.is_approved)
        
        The `is_in_counter_func` function will be called with `Comment` objects and must return `True` if the given comment
        should be counted. It must not concern itself with checking if the comment is deleted or not, django-counter-field
        does that by default.
        
        Backfilling
        -----------
        
        Often you will add a `CounterCacheField` to a model that already has a large number of associated objects. When a counter
        is created, it's value is initialized to zero. This value is likely incorrect. django-counter-field provides a couple
        of management commands that allow you to rebuild the value of a counter:
        
        1. List all available counters:
        
            $ python manage.py list_counters
        
        2. Rebuild a counter using one of the counter names given by `list_counters`:
        
            $ python manage.py rebuild_counter <counter_name>
        
        Note: The `rebuild_counter` management command will only update counters on objects that have at least one child
        object. For example articles with at least one comment. Articles with no comments  will not be updated. This
        is a conscious limitation; the use cases for such a feature seem very limited, if existent at all.
        
        
        Documentation
        -------------
        
            $ pip install Sphinx
            $ cd docs
            $ make html
            Open build/html/index.html
        
Platform: UNKNOWN
Classifier: Environment :: Web Environment
Classifier: Framework :: Django
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Topic :: Internet :: WWW/HTTP
Classifier: Topic :: Internet :: WWW/HTTP :: Dynamic Content
Provides-Extra: test
