I have three models Blogs, Posted, Tags. In Blogs model I have fields 'postedin' as foreign key to Posted model and 'tags' as manytomany fields to Tags model.
models.py:
class Posted(models.Model):
name = models.CharField(_('Posted In'),max_length=255, unique=True)
class Tags(models.Model):
name = models.CharField(_('Tag Name'),max_length=255, unique=True)
class Blogs(models.Model):
author = models.ForeignKey(CustomUser)
title=models.CharField(max_length=100)
postedin=models.ForeignKey(Posted)
tags= models.ManyToManyField(Tags)
content = models.TextField()
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
views.py:
class BlogViewSet(viewsets.ModelViewSet):
queryset=Blogs.objects.order_by('-created_at')
serializer_class= BlogsSerializer
def get_permissions(self):
if self.request.method in permissions.SAFE_METHODS:
return (permissions.AllowAny(),)
return (permissions.IsAuthenticated(),IsAuthorOfBlog())
def perform_create(self,serializer):
serializer.save(author=self.request.user)
return super(BlogViewSet,self).perform_create(serializer)
serializers.py:
class TagsSerializer(serializers.ModelSerializer):
class Meta:
model = Tags
fields = ('pk','name')
read_only_fields=('pk','name')
class PostedSerializer(serializers.ModelSerializer):
class Meta:
model = Posted
fields = ('pk','name')
read_only_fields=('pk','name')
class BlogsSerializer(serializers.ModelSerializer):
author = AccountSerializer(read_only=True,required=False)
tags=TagsSerializer(read_only=True,many=True)
tags_id = serializers.PrimaryKeyRelatedField(queryset=Tags.objects.all(), write_only=True)
postedin = PostedSerializer(read_only=True)
postedin_id = serializers.PrimaryKeyRelatedField(queryset=Posted.objects.all(), write_only=True)
class Meta:
model = Blogs
fields = ('pk','author','title','tags','tags_id','postedin','postedin_id','content','created_at','updated_at')
read_only_fields=('pk','created_at','updated_at')
def get_validation_exclusions(self, *args, **kwargs):
exclusions = super(BlogsSerializer, self).get_validation_exclusions()
return exclusions + ['author']
def create(self, validated_data):
postedin = validated_data.pop('postedin_id')
tags = validated_data.pop('tags_id')
blogs = Blogs.objects.create(tags=tags,postedin=postedin, **validated_data)
return blogs
Request sent:
{title: "nvnbv", postedin_id: "1", tags_id: ["2", "5", "1", "4"], content: "nmvmvjm"}
response receive:
{tags_id: ["Incorrect type. Expected pk value, received list."]}
I am beginner in Django-rest-framework.How to solve this error.
Thanks in advance !
The HyperlinkedModelSerializer class is similar to the ModelSerializer class except that it uses hyperlinks to represent relationships, rather than primary keys. By default the serializer will include a url field instead of a primary key field.
The root QuerySet provided by the Manager describes all objects in the database table. Usually, though, you'll need to select only a subset of the complete set of objects. The default behavior of REST framework's generic list views is to return the entire queryset for a model manager.
Renderers are used to serialize the response into a specific media type like JSON, XML, YAML, etc. Django REST Framework provides various built-in renderer classes and it also supports to write a custom renderer. We specify renderers as an iterable type (i.e tuple, list, set, etc.).
thanks @Abdulafaja for your suggestion.
Finally I got solution
BlogsSerializer should be
class BlogsSerializer(serializers.ModelSerializer):
author = AccountSerializer(read_only=True,required=False)
tags=TagsSerializer(read_only=True,many=True)
tags_id = serializers.PrimaryKeyRelatedField(queryset=Tags.objects.all(), write_only=True,many=True)
postedin = PostedSerializer(read_only=True)
postedin_id = serializers.PrimaryKeyRelatedField(queryset=Posted.objects.all(), write_only=True)
class Meta:
model = Blogs
fields = ('pk','author','title','tags','tags_id','postedin','postedin_id','content','created_at','updated_at')
read_only_fields=('pk','created_at','updated_at')
def get_validation_exclusions(self, *args, **kwargs):
exclusions = super(BlogsSerializer, self).get_validation_exclusions()
return exclusions + ['author']
def create(self, validated_data):
postedin = validated_data.pop('postedin_id')
tags = validated_data.pop('tags_id')
blogs = Blogs.objects.create(postedin=postedin, **validated_data)
for tg in tags:
blogs.tags.add(tg)
return blogs
Instead of loop, you can simply use this line blogs.tags.add(*tg)
def create(self, validated_data):
postedin = validated_data.pop('postedin_id')
tags = validated_data.pop('tags_id')
blogs = Blogs.objects.create(postedin=postedin, **validated_data)
blogs.tags.add(*tg)
return blogs
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With