I am using Django 2.2, MongoDb with Djongo. I am facing issues in POST and PATCH API. I am facing three kinds of issues.
- When performing a POST operation to create a new entry, API fails with error: Array items must be Model instances.
- What is the correct way to refer an instance of Screenplay class in POST API. Is the id of the parent class sufficient?
- How to perform a update to a specific field in Scene model including a text field in comments?
Following is the code snippet.
Sample POST API data
{
"title": "intro1",
"screenplay": "49423c83-0078-4de1-901c-f9176b51fd33",
"comments": [
{
"text": "hello world",
"author": "director"
}
]
}
models.py
import uuid
from djongo import models
class Screenplay(models.Model):
id = models.UUIDField(primary_key = True, default = uuid.uuid4,editable = False)
title = models.CharField(max_length=100)
def __str__(self):
return self.title
class Comment(models.Model):
text = models.TextField();
author = models.TextField();
def __str__(self):
return self.author +self.text
class Scene(models.Model):
id = models.UUIDField(primary_key = True, default = uuid.uuid4,editable = False)
title = models.CharField(max_length=100)
screenplay = models.ForeignKey(Screenplay, related_name='scenes', on_delete=models.CASCADE)
comments = models.ArrayModelField(
model_container = Comment,
);
def __str__(self):
return self.title
serializers.py
from rest_framework import serializers
from planning.models import Scene, Comment
class ScreenplaySerializer(serializers.ModelSerializer):
class Meta:
model = Screenplay
fields = ('id', 'title')
class CommentSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Comment
fields = ('text', 'author')
class SceneSerializer(serializers.HyperlinkedModelSerializer):
comments = CommentSerializer();
class Meta:
model = Scene
fields = ('id', 'title', 'comments')
viewsets.py
from planning.models import Screenplay, Scene, Comment
from .serializers import ScreenplaySerializer, SceneSerializer, CommentSerializer
from rest_framework import viewsets
from rest_framework.decorators import action
from rest_framework.response import Response
from rest_framework import status
from rest_framework import generics
from rest_framework.generics import RetrieveUpdateDestroyAPIView
class ScreenplayViewSet(viewsets.ModelViewSet):
queryset = Screenplay.objects.all()
serializer_class = ScreenplaySerializer
class SceneViewSet(viewsets.ModelViewSet):
queryset = Scene.objects.all()
serializer_class = SceneSerializer
class CommentViewSet(viewsets.ModelViewSet):
queryset = Comment.objects.all()
serializer_class = CommentSerializer
