Still new to Django so bear with me.
I am trying to follow Django example https://docs.djangoproject.com/en/2.2/ref/contrib/contenttypes/.
I am trying to use tests.py to create notes for student 1.
Here is tests.py:
from django.test import TestCase from gsndb.models import * from django.contrib.contenttypes.models import ContentType from django.contrib.auth.models import User # Create your tests here. student = Student.objects.get(id=4) text = "The student is content" user = User.objects.get(id=2) new_note = Note(text=text, content_object = student, user = user) new_note.save() I am wanting this to create a note for student 1. However when I run the test, I get this error:
Object of type 'Student' is not JSON serializable Here is the traceback:
Environment: Request Method: GET Request URL: http://localhost/gsndb/note/ Django Version: 2.1.7 Python Version: 3.6.8 Installed Applications: ['django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'corsheaders', 'rest_framework', 'user_app.apps.UserAppConfig', 'gsndb.apps.GsndbConfig'] Installed Middleware: ['corsheaders.middleware.CorsMiddleware', 'django.middleware.security.SecurityMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.common.CommonMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'django.middleware.clickjacking.XFrameOptionsMiddleware'] Traceback: File "/usr/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner 34. response = get_response(request) File "/usr/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 156. response = self.process_exception_by_middleware(e, request) File "/usr/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response 154. response = response.render() File "/usr/lib/python3.6/site-packages/django/template/response.py" in render 106. self.content = self.rendered_content File "/usr/lib/python3.6/site-packages/rest_framework/response.py" in rendered_content 72. ret = renderer.render(self.data, accepted_media_type, context) File "/usr/lib/python3.6/site-packages/djangorestframework_camel_case2/render.py" in render 9. **kwargs) File "/usr/lib/python3.6/site-packages/rest_framework/renderers.py" in render 107. allow_nan=not self.strict, separators=separators File "/usr/lib/python3.6/site-packages/rest_framework/utils/json.py" in dumps 28. return json.dumps(*args, **kwargs) File "/usr/lib/python3.6/json/__init__.py" in dumps 238. **kw).encode(obj) File "/usr/lib/python3.6/json/encoder.py" in encode 199. chunks = self.iterencode(o, _one_shot=True) File "/usr/lib/python3.6/json/encoder.py" in iterencode 257. return _iterencode(o, 0) File "/usr/lib/python3.6/site-packages/rest_framework/utils/encoders.py" in default 68. return super(JSONEncoder, self).default(obj) File "/usr/lib/python3.6/json/encoder.py" in default 180. o.__class__.__name__) Exception Type: TypeError at /gsndb/note/ Exception Value: Object of type 'Student' is not JSON serializable Here is models.py
class Note(models.Model): user = models.ForeignKey( get_user_model(), on_delete = models.PROTECT, ) created = models.DateTimeField(default = timezone.now) text = models.TextField() # Below the mandatory fields for generic relation content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE) object_id = models.PositiveIntegerField() content_object = GenericForeignKey('content_type','object_id') class Student(models.Model): current_school = models.ForeignKey( "School", null = True, on_delete = models.PROTECT, ) current_program = models.ForeignKey( "Program", null = True, on_delete = models.PROTECT, ) first_name = models.CharField(max_length = 35, blank=True) last_name = models.CharField(max_length = 35, blank=True) middle_name = models.CharField(max_length = 35, blank=True) """Establish choices for Gender""" GENDER_CHOICES = ( ("M", 'Male'), ("F", 'Female'), ("NB", 'NonBinary'), ) gender = models.CharField( max_length = 2, blank = True, choices = GENDER_CHOICES, ) birth_date = models.DateField(null = True) state_id = models.BigIntegerField(null = True) """Establish choices for Grade Year""" GRADE_YEAR_CHOICES = ( (0, 'Kindergarten'), (1, 'First Grade'), (2, 'Second Grade'), (3, 'Third Grade'), (4, 'Fourth Grade'), (5, 'Fifth Grade'), (6, 'Sixth Grade'), (7, 'Seventh Grade'), (8, 'Eighth Grade'), (9, 'Ninth Grade'), (10, 'Tenth Grade'), (11, 'Eleventh Grade'), (12, 'Twelfth Grade'), ) grade_year = models.SmallIntegerField( choices = GRADE_YEAR_CHOICES, null = True, ) reason_in_program = models.TextField(blank=True) notes = GenericRelation(Note) Here is serializers.py:
class NoteSerializer(serializers.ModelSerializer): class Meta: model = Note fields = ("user", "created", "text", "content_type", "object_id", "content_object") class StudentSerializer(serializers.BaseSerializer): def to_representation(self, student_obj): notes = NoteSerializer(many = True) notes_json = notes.data return { "current_school": student_obj.current_school.id, "current_program": student_obj.current_program.id, "first_name": student_obj.first_name, "last_name": student_obj.last_name, "middle_name": student_obj.middle_name, "gender": student_obj.gender, "birth_date": student_obj.birth_date, "state_id": student_obj.state_id, "grade_year": student_obj.grade_year, "reason_in_program": student_obj.reason_in_program, "notes": notes_json, } Here is my views.py:
class NoteList(generics.ListCreateAPIView): queryset = Note.objects.all() serializer_class = NoteSerializer Thanks for your time!
