ValueError: Field 'id' expected a number but got

前提・実現したいこと

現在Djangoにて投稿・コメント機能を実装しているのですが、migrateを行えずこのようなエラーが発生してしまいました。

発生している問題・エラーメッセージ

ValueError: Field 'id' expected a number but got '退会済みのユーザー'.

該当のソースコード

accounts/models.py
1
2
3
4class UserManager(BaseUserManager):
5
6    def _create_user(self, email, password, is_staff, is_superuser, **extra_fields):
7        if not email:
8            raise ValueError('Users must have an email address')
9        now = timezone.now()
10        email = self.normalize_email(email)
11        user = self.model(
12            email=email,
13            is_staff=is_staff,
14            is_active=True,
15            is_superuser=is_superuser,
16            last_login=now,
17            date_joined=now,
18            **extra_fields
19        )
20        user.set_password(password)
21        user.save(using=self._db)
22        return user
23
24    def create_user(self, email, password, **extra_fields):
25        return self._create_user(email, password, False, False, **extra_fields)
26
27    def create_superuser(self, email, password, **extra_fields):
28        user = self._create_user(email, password, True, True, **extra_fields)
29        user.save(using=self._db)
30        return user
31
32class User(AbstractBaseUser, PermissionsMixin):
33    name = models.CharField(max_length=50, null=True, blank=True)
34    email = models.EmailField(max_length=254,unique=True)
35    username= models.CharField(max_length=30,null=False, blank=True)
36    user_id = models.CharField(max_length=30,null=False, blank=True)
37    profile_image=models.ImageField(upload_to='media',null=True)
38    self_introduction = models.TextField(max_length=300, null=False, blank=True)
39    is_staff = models.BooleanField(default=False)
40    is_superuser = models.BooleanField(default=False)
41    is_active = models.BooleanField(default=True)
42    last_login = models.DateTimeField(null=True,blank=True)
43    date_joined = models.DateTimeField(auto_now_add=True)
44
45
46    USERNAME_FIELD = 'email'
47    EMAIL_FIELD = 'email'
48    REQUIRED_FIELDS = []
49
50    objects = UserManager()
51
52    def get_absolute_url(self):
53        return "/users/%i/" % self.pk
54
55    def __str__(self):
56                return self.username
57

post/models.py
1
2
3from django.db import models
4from accounts.models import User
5from django.utils import timezone
6
7
8class Post(models.Model):#投稿モデル
9    username=models.ForeignKey(User,on_delete=models.SET_DEFAULT,default='退会済みのユーザー')
10    title=models.CharField(max_length=100,blank=False,null=False)
11    post_img1=models.ImageField(upload_to='post1',blank=True,null=True)
12    post_img2=models.ImageField(upload_to='post2',blank=True,null=True)
13    post_img3=models.ImageField(upload_to='post3',blank=True,null=True)
14    text=models.TextField(max_length=5000,blank=False,null=False)
15    add_time=models.DateTimeField(default=timezone.now)
16    tag = models.TextField(max_length=200,blank=True,null=True)
17
18    def __str__(self):
19        return self.title
20
21
22class Comment(models.Model):#コメントモデル
23    target_post=models.ForeignKey(Post,on_delete=models.CASCADE)
24    username=models.ForeignKey(User,on_delete=models.SET_DEFAULT,default='退会済みのユーザー')
25    text=models.TextField(max_length=500)
26    add_time=models.DateTimeField(default=timezone.now)
27
28    def __str__(self):
29        return self.text
30
31class Reply(models.Model):#返信モデル
32    target_comment=models.ForeignKey('Comment',on_delete=models.CASCADE)
33    username=models.ForeignKey(User,on_delete=models.SET_DEFAULT,default='退会済みのユーザー')
34    text=models.TextField(max_length=500)
35    time=models.DateTimeField(default=timezone.now)
36
37    def __str__(self):
38        return self.text
39
40

post/forms.py
1
2from django.forms import ModelForm
3from post.models import Post, Comment,Reply
4
5
6class PostCreateForm(ModelForm):
7    class Meta:
8        model=Post
9        fields=[
10             'title','text','post_img1','post_img2','post_img3','tag',
11        ]
12
13class CommentForm(ModelForm):
14    class Meta:
15        model=Comment
16        fields=[
17            'text'
18        ]
19
20class ReplyForm(ModelForm):
21    class Meta:
22        model=Reply
23        fields=[
24            'text'
25        ]
26
27

post/views.py
1
2from django.contrib.auth.mixins import LoginRequiredMixin
3from django.shortcuts import redirect, get_object_or_404
4from post.forms import PostCreateForm,CommentForm,ReplyForm
5from django.urls import reverse_lazy
6from post.models import Post,Comment,Reply
7from django.views.generic import (
8    CreateView,
9    DetailView,
10
11)
12
13
14
15class PostCreateView(CreateView,LoginRequiredMixin):#投稿機能
16    template_name = 'post/post_create.html'
17    form_class = PostCreateForm
18    success_url = reverse_lazy('home')
19
20    def form_valid(self, form):
21        form.instance.username=self.request.user
22        return super().form_valid(form)
23
24
25class CommentView(CreateView,LoginRequiredMixin):#コメント機能
26    template_name = 'post/comment.html'
27    model = Comment
28    form_class = CommentForm
29
30
31    def form_valid(self, form ):
32        form.instance.username =self.request.user
33        post_pk = self.kwargs['pk']
34        post = get_object_or_404(Post, pk=post_pk)
35        comment = form.save(commit=False)
36        comment.target_post= post
37        comment.save()
38        return redirect('detail',pk=post_pk)
39
40
41    def get_context_data(self, **kwargs):
42        context = super().get_context_data(**kwargs)
43        context['post'] = get_object_or_404(Post, pk=self.kwargs['pk'])
44        return context
45
46
47class ReplyCreateView(CreateView,LoginRequiredMixin):#返信機能
48    template_name = 'post/reply.html'
49    model = Reply
50    form_class = ReplyForm
51
52    def form_valid(self, form):
53        form.instance.username = self.request.user
54        comment_pk = self.kwargs['pk']
55        comment = get_object_or_404(Comment, pk=comment_pk)
56        reply = form.save(commit=False)
57        reply.target_comment = comment
58        reply.save()
59        return redirect('detail', pk=comment.target_post.pk)
60
61    def get_context_data(self, **kwargs):
62        context = super().get_context_data(**kwargs)
63        comment_pk = self.kwargs['pk']
64        comment = get_object_or_404(Comment, pk=comment_pk)
65        context['post'] = comment.target_post
66        return context
67
68
69
70class PostDetailView(DetailView):#投稿の詳細
71    template_name = 'post/post_detail.html'
72    model = Post
73
74
75