Databaseエラー

Question

前提

DjangoでSNSを作っています。
Follow機能を実装中に以下のエラーメッセージが発生しました。

実現したいこと

エラーを解決する

発生している問題・エラーメッセージ

Cannot assign "User": "FollowersCount.FollowerID" must be a "CustomUser" instance.

該当のソースコード

from django.db import models
from accounts.models import CustomUser
# Create your models here.

class FollowersCount(models.Model):
    FollowerID = models.ForeignKey(CustomUser, on_delete=models.CASCADE,related_name='UserFollowerID')
    Follower_UserID = models.OneToOneField(CustomUser, on_delete=models.CASCADE,related_name='UserUserID')

class CustomUser(AbstractBaseUser, PermissionsMixin):
    UserID = models.CharField(('UserID'),max_length=15,unique=True,null=False)
    name = models.CharField(('Name'),max_length=32,unique=True,null=False)
    email = models.EmailField(('Email'),max_length=256,unique=True)
    birthday = models.DateTimeField(('Birthday'), default=timezone.now)
    bio = models.CharField(('bio'),max_length=1056)
    ProfileImage = models.ImageField(upload_to='images', verbose_name='ProfileImage',null=True,blank=True)
    created_at = models.DateTimeField(('create'), default= timezone.now)
    
    
    is_staff = models.BooleanField(
        ('staff status'),
        default=False,
        help_text=('Designates whether the user can log into this admin site.'),
    )
    is_active = models.BooleanField(
        ('active'),
        default=True,
        help_text=(
            'Designates whether this user should be treated as active. '
            'Unselect this instead of deleting accounts.'
        ),
    )

    objects = UserManager()
    
    USERNAME_FIELD = 'email'
    EMAIL_FIELD = 'email'
    REQUIRED_FIELDS = []

    class Meta:
        verbose_name = ('user')
        verbose_name_plural = ('users')

    def clean(self):
        super().clean()
        self.email = self.__class__.objects.normalize_email(self.email)

from django.shortcuts import render,get_object_or_404,redirect
from accounts.models import CustomUser
from .models import FollowersCount
# Create your views here.

def follow_base(request):
    #モデルで作成したCustomUserクラスからログイン中のユーザー情報を取得
    user_data = CustomUser.objects.get(id = request.user.id)
    data = CustomUser.objects.all()
    params = {
        'data':data,
    }
    return render(request,'follow/follow_base.html',params)

def follow_index(request,pk):
    CustomUser_data = get_object_or_404(CustomUser,pk=pk)
    
    Follow_UserID = CustomUser_data.UserID
    current_user = Follow_UserID #フォローするユーザー
    logged_in_user = request.user.UserID #ログインしているユーザー（自分）
    print(current_user)
    print(logged_in_user)
    params = {
        'CustomUser_data': CustomUser_data,
        'current_user':current_user,
        'logged_in_user':logged_in_user,
    }
    return render(request,'follow/follow_count.html',params)


def follow_count(request,pk):
    #UserID = CustomUser.objects.get(UserID=UserID)
    #FolloweID = CustomUser.objects.get(FolloweID=UserID)
    if request.method == 'POST':
        value = request.POST['value']
        user = request.POST['user']
        follower = request.POST['follower']
        print(value)
        print(user)
        print(follower)
        if value == 'follow':
            followers_cnt = FollowersCount.objects.create(FollowerID= user, Follower_UserID = follower)
            followers_cnt.save()
            
        return redirect('/?user='+user)
    

<div class="select-container">
    <h1 class="title">User詳細</h1>
    <div class="select-card">
        <div class="card-imgframe">
            <img src="{{ CustomUser_data.ProfileImage.url }}" width="350" height="400" />
        </div>
        <div class="select-card-textbox">
            <div class="select-card-name">
                <h1>{{ CustomUser_data.UserID }}</h1>
            </div>
            <div class="select-card-text">
                <h3>{{ CustomUser_data.name }}</h3>
            </div>
            <div class="select-card-explain">
                <h4>{{ CustomUser_data.bio }}</h4>
            </div>
        </div>
        <form action="followers_count" method="POST">
            {% csrf_token %}
            <input type="hidden" name="user" value="{{current_user}}" readonly/> <!--ここはフォローしたいユーザー（相手）-->
            <input type="hidden" name="follower" value="{{logged_in_user}}" readonly/> <!--ここはログインしているユーザー（自分）-->
            <input type="hidden" name="value" value="follow" readonly/>
            <button type="submit" class="btn profile-edit-btn">
                Follow
            </button>
        </form>
    </div>
</div>

試したこと

databaseなどの見直しや作り直しを何回もしましたが、このエラーが出てきてしまいわかりません。

補足情報（FW/ツールのバージョンなど）

Django~=3.1.4
django-allauth~=0.41.0
django-widget-tweaks~=1.4.8
Pillow~=8.1.0

Comments

[yuma.inaura]

どんなタイミングでエラーが発生するんでしょうか？
エラーの行番号は分かりませんか？

[ashigaru21]

Followボタンを押すと(followApp)のviews.pyの
followers_cnt = FollowersCount.objects.create(FollowerID= user, Follower_UserID = follower)
部分で上記のエラーが起こってしまいます。

Answer 1

def follow_count(request,pk):
    CustomUser_data = get_object_or_404(CustomUser,pk=pk)
    #UserID = CustomUser.objects.get(UserID=UserID)
    #FolloweID = CustomUser.objects.get(FolloweID=UserID)
    if request.method == 'POST':
        value = request.POST['value']
        user = request.POST['user']
        follower = request.POST['follower']
        print(value)
        print(user)
        print(follower)
        if value == 'follow':
            follower_user = CustomUser.objects.get(UserID=follower)　＃追加
            user_follower = CustomUser.objects.get(UserID=user)　#追加
            followers_cnt = FollowersCount.objects.create(FollowerID = follower_user, FollowerUserID = user_follower);
            followers_cnt.save()
        params = {
            'CustomUser_data': CustomUser_data,
        }
        return redirect('/?user='+user)

#追加の部分でCustomUserと繋げることで動きました！！