django-extra-model-fields

django-extra-model-fields is a Django package that allows you to attach and manage additional fields on any model dynamically. This package is designed to be simple and flexible, enabling you to add key-value pairs to any Django model without modifying the original model structure.

Features

• Add custom key-value pairs to any Django model.
• Query and manage these fields easily.
• Supports Django's admin interface for easier management.

Installation

You can install django-extra-model-fields via pip. Add it to your requirements.txt or install it directly using pip:

pip install django-extra-model-fields

Usage

Adding to Your Django Project

1. Add extra_fields to your INSTALLED_APPS:

   In your Django project's settings.py, add extra_fields to INSTALLED_APPS:

   INSTALLED_APPS = [
       ...
       'extra_fields',
   ]

2. Extend Your Models:

   To add extra fields to a model, make your model inherit from ExtraFieldModel:

   from django.db import models
   from extra_fields.models import ExtraFieldModel
   
   class MyModel(ExtraFieldModel):
       name = models.CharField(max_length=100)

3. Migrate Your Database:

   Create and apply migrations for the new extra_fields tables:

   python manage.py makemigrations
   python manage.py migrate

4. Use the Extra Fields:

   You can now use the set_extra_field, get_extra_field, and delete_extra_field methods to manage extra fields:

   blog = Blog.objects.create(title="Intorduction to Computers", content="<p>blog body goes here</p>")
   
   # setting key value
   blog.set_value('author', 'John Smith')
   blog.set_value('meta_data', {'clicks': 100, 'views': 200})
   
   # getting values
   blog.get_value('author')  # returns a string: 'John Smith'
   blog.get_value('meta_data')  # returns a python dict: {'clicks': 100, 'views': 200}
   
   # getting all keys
   blog.get_keys()  # return a queryset ['author', 'meta_data']
   
   # deleting a key-value pair
   blog.delete_key('author')

5. Filtering

   # list all extra_fields
   blog.extra_fields.all()  # returns a query set of <ExtraField>
   
   # filter on extra_fields
   Blog.objects.filter(extra_fields__key='author', extra_fields__value='John Smith')
   Blog.objects.filter(extra_fields__value__clicks__gte=100)

6. Add Inline editor on Admin panel

   Add ExtraFieldModelInline in inlines of the model Admin

   from django.contrib import admin
   
   from .models import Blog
   from extra_field.admin import ExtraFieldModelInline
   
   class BlogAdmin(admin.ModelAdmin):
       """Admin for blog model."""
   
       list_display = ('title', 'content')
       inlines = [ExtraFieldModelInline]
   
   admin.site.register(Blog, BlogAdmin)