Django Rest Framework Creating Foreign Key Serializer context object empty? - django

Question

I'm trying my hand at creating a little django api for school. At the moment I'm having trouble getting the authorized user when I attempt to create a model with a foreign key. Here is the code I've been trying
MODEL:
class JobListing(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
company_name = models.CharField(max_length=80)
job_position = models.CharField(max_length=50)
job_phone = models.CharField(max_length=10)
job_email = models.EmailField()
job_description = models.TextField()
job_schedule = models.CharField(max_length=500)
job_post_date = models.DateField(auto_now_add=True)
VIEW:
class CreatePostView(generics.CreateAPIView):
"""
API endpoint that allows a Job Post to be created
"""
#queryset = ''
authentication_classes = (TokenAuthentication,)
permission_classes = (IsAuthenticated,)
serializer_class = JobPostingSerializer
SERIALIZER:
class JobPostingSerializer(serializers.ModelSerializer):
user = serializers.SerializerMethodField()
class Meta:
model = JobListing
fields = ('user', 'company_name', 'job_position', 'job_phone', 'job_email', 'job_description', 'job_schedule')
def create(self, validated_data):
post = super().create(validated_data)
post.save()
return post
def get_user(self, instance):
user = self.context['request'].user
return user.id
URLS:
urlpatterns = [
url(r'^', include(router.urls)),
url(r'^api-auth', include('rest_framework.urls', namespace='rest_framework')),
path('home/', views.Home.as_view(), name='home'),
path('login/', views.Login.as_view(), name='login'),
path('getUserDetail/', views.TestSimpleUserJsonAuth.as_view(), name='getUserDetail'),
path('getPosts/', views.getPosts.as_view(), name='getPosts'),
url(r'signup/', views.CreateUserView.as_view(), name='signup'),
url(r'createPost/', views.CreatePostView.as_view(), name='createPost')
I have tried a number of different variations of this including overriding the get context method and trying to change the viewset I'm using. Nothing seems to get it working. Error I'm seeing right now is
IntegrityError at /createPost/
NOT NULL constraint failed: temploybackend_joblisting.user_id
Request Method: POST
Request URL: http://192.168.99.100:8000/createPost/
Traceback:
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py" in execute
303. return Database.Cursor.execute(self, query, params)
The above exception (NOT NULL constraint failed: temploybackend_joblisting.user_id) was the direct cause of the following exception:
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
35. response = get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
128. response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
126. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/decorators/csrf.py" in wrapped_view
54. return view_func(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py" in view
69. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
494. response = self.handle_exception(exc)
File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py" in handle_exception
454. self.raise_uncaught_exception(exc)
File "/usr/local/lib/python3.6/site-packages/rest_framework/views.py" in dispatch
491. response = handler(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/rest_framework/generics.py" in post
192. return self.create(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/rest_framework/mixins.py" in create
21. self.perform_create(serializer)
File "/usr/local/lib/python3.6/site-packages/rest_framework/mixins.py" in perform_create
26. serializer.save()
File "/usr/local/lib/python3.6/site-packages/rest_framework/serializers.py" in save
214. self.instance = self.create(validated_data)
File "/var/www/temploybackend/serializers.py" in create
54. post = super().create(validated_data)
File "/usr/local/lib/python3.6/site-packages/rest_framework/serializers.py" in create
917. instance = ModelClass.objects.create(**validated_data)
File "/usr/local/lib/python3.6/site-packages/django/db/models/manager.py" in manager_method
82. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py" in create
417. obj.save(force_insert=True, using=self.db)
File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py" in save
729. force_update=force_update, update_fields=update_fields)
File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py" in save_base
759. updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py" in _save_table
842. result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/usr/local/lib/python3.6/site-packages/django/db/models/base.py" in _do_insert
880. using=using, raw=raw)
File "/usr/local/lib/python3.6/site-packages/django/db/models/manager.py" in manager_method
82. return getattr(self.get_queryset(), name)(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py" in _insert
1125. return query.get_compiler(using=using).execute_sql(return_id)
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/compiler.py" in execute_sql
1281. cursor.execute(sql, params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in execute
100. return super().execute(sql, params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in execute
68. return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in _execute_with_wrappers
77. return executor(sql, params, many, context)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.6/site-packages/django/db/utils.py" in __exit__
89. raise dj_exc_value.with_traceback(traceback) from exc_value
File "/usr/local/lib/python3.6/site-packages/django/db/backends/utils.py" in _execute
85. return self.cursor.execute(sql, params)
File "/usr/local/lib/python3.6/site-packages/django/db/backends/sqlite3/base.py" in execute
303. return Database.Cursor.execute(self, query, params)
Exception Type: IntegrityError at /createPost/
Exception Value: NOT NULL constraint failed: temploybackend_joblisting.user_id
Thank you for any help that can be provided!

Answer 1

SerializerMethodField is read_only field and not using in object creation. You need to replace it with PrimaryKeyRelatedField with default CurrentUserDefault:
class JobPostingSerializer(serializers.ModelSerializer):
user = serializers.PrimaryKeyRelatedField(
read_only=True,
default=serializers.CurrentUserDefault()
)
class Meta:
model = JobListing
fields = ('user', 'company_name', 'job_position', 'job_phone', 'job_email', 'job_description', 'job_schedule')
def create(self, validated_data):
post = super().create(validated_data)
post.save()
return post