django-rest-framework-serializer-mixins
Mixins for Django Rest Framework Serializer
How to install
pip install djangorestframework-serializer-mixinsHow to use DynamicFieldsMixin
Assume you have a Post model:
# testapp/models.py
from django.conf import settings
from django.db import models
class Post(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='posts')
title = models.CharField(max_length=128)
body = models.TextField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
def __str__(self):
return self.title
class Meta:
ordering = ['-created_at']Write DynamicPostSerializer with DynamicFieldsMixin:
# testapp/serializers.py
from rest_framework import serializers
from rest_framework_serializer_mixins import DynamicFieldsMixin
from .models import Post
class DynamicPostSerializer(DynamicFieldsMixin, serializers.ModelSerializer):
class Meta:
model = Post
fields = (
'body',
'created_at',
'id',
'title',
'updated_at',
'user',
)
read_only_fields = (
'id',
'user',
)Now, you can define fields and read_only_field like this:
>>> from django.contrib.auth.models import User
>>> from testapp.models import Post
>>> from testapp.serializers import DynamicPostSerializer
>>> user = User.objects.create_user('user', '[email protected]', '123456')
>>> post = Post.objects.create(user=user, title='My Title', body='My Body')
>>> serializer = DynamicPostSerializer(post) # return fields and read_only_fields from Meta
>>> serializer.data
{'body': 'My Body', 'created_at': '2018-02-14T14:15:29.772209Z', 'id': 1, 'title': 'My Title', 'updated_at': '2018-02-14T14:15:29.772312Z', 'user': 1}
>>> serializer = DynamicPostSerializer(post, fields=('title', 'body')) # return only title and body fields
>>> serializer.data
{'body': 'My Body', 'title': 'My Title'}
>>> serializer = DynamicPostSerializer(post, read_only_fields=('title', 'body'), data={'title': 'New Title', 'body': 'New Body'}) # set title and body as read_only_fields
>>> serializer.is_valid()
True
>>> serializer.save()
<Post: My Title>
>>> serializer.data
{'body': 'My Body', 'created_at': '2018-02-14T14:15:29.772209Z', 'id': 1, 'title': 'My Title', 'updated_at': '2018-02-14T14:19:14.838001Z', 'user': 1} # title and body don't change