更正 Django 用户模型外键问题

我正在使用内置的 django 用户模型。我不断收到错误django.db.utils.IntegrityError: FOREIGN KEY constraint failed

我没有在任何其他模型中使用用户模型，反之亦然。

models.py 看起来像这样

from django.contrib.auth.models import User
from django.utils import timezone
from django.db.models import CharField
from django.db.models import BooleanField
from django.db.models import TextField
from django.db.models import DateTimeField

class Course(models.Model): 
    id = models.AutoField(primary_key=True)
    name = CharField(max_length=100)

class Project(models.Model):
    id = models.AutoField(primary_key=True)
    desc = CharField(max_length=150)
    name = CharField(max_length=50)
    storyboard_file_path = TextField()
    storyboard_completed = BooleanField(default=False)
    filming_complete = BooleanField(default=False)
    audio_complete = BooleanField(default=False)
    production_complete = BooleanField(default=False)
    aggregation_complete = BooleanField(default=False)
    video_file_path = TextField()
    final_review_complete = BooleanField(default=False)
    course = models.ForeignKey(Course, on_delete=models.CASCADE, related_name="projects", null=True, blank=True)

class Status(models.Model):
    status_id = models.IntegerField(primary_key=True)
    desc = CharField(max_length=150)
    name = CharField(max_length=50)

class Event(models.Model):
    project_id = models.ForeignKey(Project, on_delete=models.CASCADE, null=True, blank=True)
    status_id = models.ForeignKey(Status, on_delete=models.CASCADE, null=True, blank=True)
    datetime = models.DateTimeField(auto_now_add=True, blank=True)

serializers.py 看起来像这样

from rest_framework import serializers
from .models import Event
from .models import Project
from .models import Course
from rest_framework_jwt.settings import api_settings


class UserSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id', 
        "password",
        "last_login",
        "is_superuser",
        "username",
        "first_name",
        "last_name",
        "email",
        "is_staff",
        "is_active",
        "date_joined",
        "groups",
        "user_permissions")

    def create(self, validated_data):
        password = validated_data.pop('password', None)
        instance = self.Meta.model(**validated_data)
        if password is not None:
            instance.set_password(password)
        instance.save()
        return instance

    def update(self, instance, validated_data):
        for attr, value in validated_data.items():
            if attr == 'password':
                instance.set_password(value)
            else:
                setattr(instance, attr, value)
        instance.save()
        return instance

    def get_jwt_token(user):
        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER

        payload = jwt_payload_handler(user)
        return jwt_encode_handler(payload)

class ProjectSerializer(serializers.ModelSerializer):
    class Meta:
        model = Project
        fields = ('id', 'desc', 'name', 'storyboard_file_path', 
        'storyboard_completed', 'filming_complete', 'audio_complete',  
        'production_complete', 'aggregation_complete', 'video_file_path',
        'final_review_complete', 'course')

    def create(self, validated_data):
        instance = self.Meta.model(**validated_data)
        instance.save()
        return instance

    def update(self, instance, validated_data):
        for attr, value in validated_data.items():
                setattr(instance, attr, value)
        instance.save()
        return instance

class CouserSerializer(serializers.ModelSerializer):
    projects = ProjectSerializer(many=True, read_only=True)

    class Meta:
        model = Course
        fields = ('id', 'name', 'projects')

    def create(self, validated_data):
        instance = self.Meta.model(**validated_data)
        instance.save()
        return instance

我正在尝试加载夹具

{
    "model": "auth.user",
    "pk": 1,
    "fields": {
        "password": "pbkdf2_sha256$120000$V2isoXl1Q88l$sVuB+25I6UNNLY76Ti0EixAu/Ucimqi7rFpbadDzqzc=",
        "last_login": null,
        "is_superuser": true,
        "username": "[email protected]",
        "first_name": "Admin",
        "last_name": "User",
        "email": "[email protected]",
        "is_staff": true,
        "is_active": true,
        "date_joined": "2019-04-16T00:16:13.252Z",
        "groups": [1],
        "user_permissions": []
    }
},
{
    "model": "auth.user",
    "pk": 2,
    "fields": {
        "password": "pbkdf2_sha256$120000$6YHv5JMayFnN$+Y2TqedyjZq02kEw/0ZaXtyigzaH2+BRUIqqkSeAG90=",
        "last_login": null,
        "is_superuser": false,
        "username": "[email protected]",
        "first_name": "Content",
        "last_name": "Manager",
        "email": "[email protected]",
        "is_staff": true,
        "is_active": true,
        "date_joined": "2019-04-16T00:19:01.130Z",
        "groups": [2],
        "user_permissions": []
    }
}
]

我不明白这个外键错误是从哪里来的。任何帮助，将不胜感激。