django-api-mixins 0.1.2

Django REST Framework mixins for ViewSets and APIViews - APIMixin, ModelMixin, RelationshipFilterMixin, RoleBasedFilterMixin. Simplify Django API development with reusable mixins.

django-api-mixins

Django REST Framework API Mixins - A collection of powerful, reusable mixins for Django REST Framework ViewSets and APIViews to simplify common API development patterns. Perfect for building REST APIs with Django.

📦 Available on PyPI: https://pypi.org/project/django-api-mixins/

Keywords: Django REST Framework, DRF, Django API, ViewSets, APIViews, Mixins, Django Mixins, REST API, Serializers, Queryset Filtering

Features

• APIMixin: Dynamic serializer selection based on action (create, update, list, retrieve)
• ModelMixin: Automatic filter field generation for Django models
• ModelFilterFieldsMixin: Automatically sets filterset_fields from models with get_filter_fields() (requires django-filter)
• OpenAPIFilterParametersMixin: Adds OpenAPI/Swagger filter parameters for APIView (requires django-filter and drf-spectacular)
• RelationshipFilterMixin: Automatic filtering for reverse relationships and direct fields
• RoleBasedFilterMixin: Role-based queryset filtering for multi-tenant applications

Installation

Basic installation:

pip install django-api-mixins

With optional dependencies:

# For ModelFilterFieldsMixin (requires django-filter)
pip install django-api-mixins[filters]

# For OpenAPIFilterParametersMixin (requires drf-spectacular)
pip install django-api-mixins[spectacular]

# Install all optional dependencies
pip install django-api-mixins[all]

Requirements

Core dependencies (required):

• Python 3.8+
• Django 3.2+
• Django REST Framework 3.12+

Optional dependencies:

• django-filter>=23.0 - Required for ModelFilterFieldsMixin and OpenAPIFilterParametersMixin
• drf-spectacular>=0.26.0 - Required for OpenAPIFilterParametersMixin

Quick Start

APIMixin

Use different serializers for different actions (create, update, list, retrieve):

from rest_framework import viewsets
from django_api_mixins import APIMixin

class UserViewSet(APIMixin, viewsets.ModelViewSet):
    queryset = User.objects.all()
    serializer_class = UserSerializer  # Default serializer
    create_serializer_class = UserCreateSerializer  # For POST requests
    update_serializer_class = UserUpdateSerializer  # For PUT/PATCH requests
    list_serializer_class = UserListSerializer  # For GET list requests
    retrieve_serializer_class = UserDetailSerializer  # For GET detail requests

The mixin also automatically handles list data in requests:

# POST /api/users/
# Body: [{"name": "User1"}, {"name": "User2"}]
# Automatically sets many=True for list data

ModelMixin

Automatically generate filter fields for all model fields:

from django.db import models
from django_api_mixins import ModelMixin

class Product(models.Model, ModelMixin):
    name = models.CharField(max_length=100)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    created_at = models.DateTimeField(auto_now_add=True)
    is_active = models.BooleanField(default=True)

# Automatically generates filter fields:
# - name: exact, in, isnull
# - price: exact, in, isnull, gte, lte
# - created_at: exact, in, isnull, gte, lte
# - is_active: exact, in, isnull

Use in your ViewSet with Django Filter Backend:

from rest_framework import viewsets
from django_filters.rest_framework import DjangoFilterBackend
from django_api_mixins import ModelMixin

class ProductViewSet(viewsets.ModelViewSet):
    queryset = Product.objects.all()
    filter_backends = [DjangoFilterBackend]
    filterset_fields = Product.get_filter_fields()  # Use auto-generated fields

Filter related models:

# Get filter fields for a related model
filter_fields = Product.get_filter_fields_for_related_model('category')
# Returns: {'category__name': [...], 'category__id': [...], ...}

# Get filter fields for a foreign key field
filter_fields = Order.get_filter_fields_for_foreign_fields('product')
# Returns: {'product__name': [...], 'product__price': [...], ...}

ModelFilterFieldsMixin

⚠️ Requires: django-filter package. Install with pip install django-filter or pip install django-api-mixins[filters]

Automatically sets filterset_fields from a model that uses ModelMixin (or any model with a get_filter_fields() class method). Works with APIView, GenericAPIView, and ViewSets.

from rest_framework import viewsets
from django_filters.rest_framework import DjangoFilterBackend
from django_api_mixins import ModelFilterFieldsMixin

# ViewSet / GenericAPIView: filter fields come from queryset.model
class UnitViewSet(ModelFilterFieldsMixin, viewsets.ModelViewSet):
    queryset = Unit.objects.all()  # Unit must have ModelMixin or get_filter_fields()
    serializer_class = UnitSerializer
    filter_backends = [DjangoFilterBackend]
    # filterset_fields auto-set from Unit.get_filter_fields()

# APIView: set model so the mixin can resolve filter fields
from rest_framework.views import APIView

class UnitListAPIView(ModelFilterFieldsMixin, APIView):
    model = Unit  # required for APIView
    filter_backends = [DjangoFilterBackend]
    
    def get_queryset(self):
        return Unit.objects.all()
    
    def get(self, request):
        queryset = self.filter_queryset(self.get_queryset())
        # ... rest of your logic

# Optional: use a different model for filter fields than the queryset model
class MyViewSet(ModelFilterFieldsMixin, viewsets.ModelViewSet):
    queryset = SomeProxy.objects.all()
    filterset_model = Unit  # use Unit.get_filter_fields() instead of SomeProxy
    filter_backends = [DjangoFilterBackend]

Note: If django-filter is not installed, you'll get a clear error message with installation instructions when you try to use this mixin.

OpenAPIFilterParametersMixin

⚠️ Requires: Both django-filter and drf-spectacular packages. Install with pip install django-filter drf-spectacular or pip install django-api-mixins[all]

Adds OpenAPI/Swagger filter parameters for plain APIView so Swagger shows the same filter query params as GenericAPIView/ViewSet. For GenericAPIView/ViewSet this mixin is a no-op (Spectacular already adds params).

from rest_framework.views import APIView
from django_filters.rest_framework import DjangoFilterBackend
from django_api_mixins import OpenAPIFilterParametersMixin, ModelFilterFieldsMixin

# With Swagger/OpenAPI filter parameters
class UnitListAPIView(OpenAPIFilterParametersMixin, ModelFilterFieldsMixin, APIView):
    model = Unit  # required
    filter_backends = [DjangoFilterBackend]
    
    def get_queryset(self):
        return Unit.objects.all()
    
    def get(self, request):
        queryset = self.filter_queryset(self.get_queryset())
        # ... rest of your logic
        # Filter parameters will appear in Swagger/OpenAPI docs

# Without Swagger params: use only ModelFilterFieldsMixin
class UnitListAPIView(ModelFilterFieldsMixin, APIView):
    model = Unit
    filter_backends = [DjangoFilterBackend]
    # Filtering works, but params won't appear in OpenAPI docs

Note: If django-filter or drf-spectacular is not installed, you'll get a clear error message with installation instructions when you try to use this mixin.

RelationshipFilterMixin

Automatically apply filters for reverse relationships and direct fields:

from rest_framework import viewsets
from django_api_mixins import RelationshipFilterMixin

class OrderViewSet(RelationshipFilterMixin, viewsets.ModelViewSet):
    queryset = Order.objects.all()
    
    # Define which reverse relationship filters to allow
    reverse_relation_filters = [
        'customer__name',
        'customer__email',
        'product__category__name',
    ]
    
    # Define which filters support list/array values
    listable_filters = ['customer__id', 'product__id']

Important: Place the mixin BEFORE the ViewSet class:

# ✅ Correct
class OrderViewSet(RelationshipFilterMixin, viewsets.ModelViewSet):
    pass

# ❌ Wrong
class OrderViewSet(viewsets.ModelViewSet, RelationshipFilterMixin):
    pass

Usage examples:

# Filter by customer name
GET /api/orders/?customer__name=John

# Filter by multiple customer IDs (listable filter)
GET /api/orders/?customer__id=1,2,3
# or
GET /api/orders/?customer__id=[1,2,3]

# Filter by product category
GET /api/orders/?product__category__name=Electronics

RoleBasedFilterMixin

Automatically filter querysets based on user roles:

from rest_framework import viewsets
from django_api_mixins import RoleBasedFilterMixin

class OrderViewSet(RoleBasedFilterMixin, viewsets.ModelViewSet):
    queryset = Order.objects.all()
    
    # Required: field name to filter on
    role_filter_field = 'operator_type'
    
    # Optional: roles that see all data
    admin_roles = ['admin', 'super_admin']
    
    # Optional: roles that see no data
    excluded_roles = ['guest']
    
    # Optional: custom role to field value mapping
    role_mapping = {
        'custom_role': 'custom_value',
        'manager': 'MGR',
    }

Important: Place the mixin BEFORE the ViewSet class:

# ✅ Correct
class OrderViewSet(RoleBasedFilterMixin, viewsets.ModelViewSet):
    pass

# ❌ Wrong
class OrderViewSet(viewsets.ModelViewSet, RoleBasedFilterMixin):
    pass

How it works:

1. Extracts the user's role from user.role.name
2. Admin roles see all data (no filtering)
3. Excluded roles see no data (empty queryset)
4. Other roles are filtered by role_filter_field = role_name (or mapped value)

Example:

# User with role.name = 'operator'
# Model has operator_type field
# Automatically filters: Order.objects.filter(operator_type='operator')

# User with role.name = 'admin'
# Sees all orders (no filtering)

# User with role.name = 'guest'
# Sees no orders (queryset.none())

FieldLookup Enum

The package includes a FieldLookup enum for consistent lookup naming:

from django_api_mixins import FieldLookup

FieldLookup.EXACT      # "exact"
FieldLookup.ICONTAINS  # "icontains"
FieldLookup.CONTAINS   # "contains"
FieldLookup.ISNULL     # "isnull"
FieldLookup.GTE        # "gte"
FieldLookup.LTE        # "lte"
FieldLookup.IN         # "in"

Combining Mixins

You can combine multiple mixins:

from rest_framework import viewsets
from django_filters.rest_framework import DjangoFilterBackend
from django_api_mixins import (
    APIMixin,
    ModelFilterFieldsMixin,
    RelationshipFilterMixin,
    RoleBasedFilterMixin,
)

class OrderViewSet(
    ModelFilterFieldsMixin,  # Auto-set filterset_fields from model
    RelationshipFilterMixin,
    RoleBasedFilterMixin,
    APIMixin,
    viewsets.ModelViewSet
):
    queryset = Order.objects.all()
    serializer_class = OrderSerializer
    create_serializer_class = OrderCreateSerializer
    filter_backends = [DjangoFilterBackend]
    
    role_filter_field = 'operator_type'
    reverse_relation_filters = ['customer__name', 'product__category__name']
    listable_filters = ['customer__id']

Note: The order of mixins matters! Place filtering mixins before the ViewSet class.

Optional Dependencies: If using ModelFilterFieldsMixin or OpenAPIFilterParametersMixin, make sure to install the required dependencies:

• ModelFilterFieldsMixin requires: django-filter
• OpenAPIFilterParametersMixin requires: django-filter and drf-spectacular

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

MIT License - see LICENSE file for details.

Support

For issues, questions, or contributions, please visit the GitHub repository.

PyPI

This package is published on PyPI and can be installed via pip:

pip install django-api-mixins

PyPI Project Page: https://pypi.org/project/django-api-mixins/

Latest Version: 0.1.2 (Released: Feb 21, 2026)