This usually happens when you have added and EmbeddedModel and not passing
any value to that field while creation.
Hope this helps.
On Sunday, 19 August 2018 19:32:49 UTC+5:30, Sagar wrote:
>
> Hi,
> I'm trying to create embedded documents in mongodb using django. I'm
> facing this error when I tried to insert a post in database.
> "ValueError at /post/Value: None must be instance of Model: <class
> 'django.db.models.base.Model'>"
> Here is my code.
> models.py
> from djongo import models
>
>
> # Schema for comments collection which include in belonging post
> class Comments(models.Model):
> username = models.CharField(max_length=25, blank=False)
> comment = models.TextField()
> time_stamp = models.DateTimeField(auto_now_add=True)
>
>
> # Schema for post collection
> class Post(models.Model):
> username = models.CharField(max_length=25, blank=False)
> title = models.CharField(max_length=100, blank=False)
> post = models.TextField()
> time_stamp = models.DateTimeField(auto_now_add=True)
> comments = models.EmbeddedModelField('Comments')
>
> # allows to use all functionality of django orm
> objects = models.DjongoManager()
>
> def __str__(self):
> return self.post
>
> serializers.py
>
> from rest_framework import serializers
> from models import Post, Comments
>
>
> class PostSerializer(serializers.ModelSerializer):
> class Meta:
> model = Post
> fields = ('id', 'username', 'title', 'post', 'time_stamp')
>
>
> class CommentsSerializer(serializers.ModelSerializer):
> class Meta:
> model = Comments
> fields = '__all__'
>
> views.py
> from rest_framework_mongoengine import generics
> from serializers import PostSerializer, CommentsSerializer
> from models import Post, Comments
>
>
> class PostAPIView(generics.CreateAPIView):
> lookup_field = 'id'
> serializer_class = PostSerializer
>
> def get_queryset(self):
> return Post.__objects.all()
>
>
> class CommentsAPIView(generics.CreateAPIView):
> lookup_field = 'id'
> serializer_class = CommentsSerializer
>
> def get_queryset(self):
> return Comments.__objects.all()
>
> what is the problem with the code? Is this right method to create embedded
> documents in mongodb?
> I used python3.6.4, django2.1, djongo1.2.29 and other libraries like
> pymongo and mongoengine
>
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