我正在努力为学校创建一个小django api。目前，当我尝试使用外键创建模型时遇到授权用户时遇到问题。这是我一直在尝试的代码模型：
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)
视图：
class CreatePostView(generics.CreateAPIView):
"""
API endpoint that allows a Job Post to be created
"""
#queryset = ''
authentication_classes = (TokenAuthentication,)
permission_classes = (IsAuthenticated,)
serializer_class = JobPostingSerializer
串行器：
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')
我已经尝试了许多不同的变体，包括重写get上下文方法并尝试更改我正在使用的视图集。似乎没有什么能让它发挥作用。我现在看到的错误是
/ createPost / NOT NULL约束中的IntegrityError失败：temploybackend_joblisting.user_id
请求方法：POST请求URL：http://192.168.99.100:8000/createPost/
追溯：
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
感谢您提供的任何帮助！
SerializerMethodField是read_only字段，不在对象创建中使用。您需要将PrimaryKeyRelatedField替换为默认的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