user_idの紐づけ方法を教えて下さい

postsテーブルのuser_idがnullになっている

id	create_at           update_at	        country_id	image_id	user_id
1	2024-11-19 00:28:20	2024-11-19 00:28:23	1        	1       	NULL

accounts/models.py
from django.db import models
from django.contrib.auth.models import (
  BaseUserManager, AbstractBaseUser, PermissionsMixin
)
from django.urls import reverse_lazy 

class UserManager(BaseUserManager): 
  def create_superuser(self, username, email, password=None):
    if not email: 
      raise ValueError('Enter Email')
    user = self.model(username=username, email=email) 
    user.set_password(password) 
    user.save(using=self._db) 
    return user
  
  def create_superuser(self, username, email, password=None):
    user = self.model(username=username, email=email)
    user.set_password(password)
    user.is_staff = True
    user.is_active = True
    user.is_superuser = True
    user.save(using=self._db)
    return user

class Users(AbstractBaseUser, PermissionsMixin):
  username = models.CharField(max_length=150)
  email = models.EmailField(max_length=255, unique=True) 
  is_active = models.BooleanField(default=True)
  is_staff = models.BooleanField(default=False)
  
  USERNAME_FIELD = 'email' 
  REQUIRED_FIELDS = ['username'] 
  
  objects = UserManager() 
  
  def get_absolute_url(self):
    return reverse_lazy('accounts:user_login')

posts/models.py
from django.db import models
from accounts.models import Users
from django.contrib.auth import get_user_model

class PostCountry(models.Model):
  COUNTRY = [

    ]
  
  country = models.CharField(choices=COUNTRY, max_length=100)
  
  """
  class Meta:
    db_table = 'post_country' 
    
  def __str__(self):
    return self.country 
  """
  
  def __str__(self):
    return dict(self.COUNTRY).get(self.country,"不明")
  
class PostPictures(models.Model):
  image = models.FileField(upload_to='image/')
  
  def __str__(self):
    return self.image.name 
  
class Post(models.Model):
  PARKING = [
    ('1', 'あり(無料)'),
    ('2', 'あり(有料)'),
    ('3', 'なし'),
    ('4', '不明'),
  ]
  BABY = [
      ('1', 'おむつ台・授乳室あり'),
      ('2', 'おむつ台あり'),
      ('3', '授乳室あり'),
      ('4', 'なし'),
      ('5', '不明'),
  ]
  
  user =  models.ForeignKey(Users, on_delete=models.CASCADE, null=True)
  image = models.ForeignKey(PostPictures, on_delete=models.CASCADE)
  spot_name = models.CharField(max_length=50)
  country = models.ForeignKey(PostCountry, on_delete=models.CASCADE) 
  address = models.CharField(max_length=100, null=True,blank=True)
  free = models.PositiveIntegerField(null=True,blank=True)
  parking = models.CharField(choices=PARKING, max_length=10)
  baby_station = models.CharField(choices=BABY, max_length=50)
  other = models.TextField(null=True,blank=True)
  create_at = models.DateTimeField(null=True)
  update_at = models.DateTimeField(null=True)
  
  class Meta:
    db_table = 'posts' 
    
  def __str__(self):
    return self.spot_name 

posts/views.py
from django.http import HttpResponse
from django.shortcuts import render
from django.views.generic import ListView, CreateView
from django.urls import reverse_lazy

from .forms import PostForm
from .models import Post
from django.views import View
from django.contrib.auth.mixins import LoginRequiredMixin

import os

class ListView(LoginRequiredMixin, ListView):
    template_name = 'list.html'
    model = Post
    context_object_name = 'posts'
    
    def get_queryset(self):
      print(Post.objects.all())
      return super().get_queryset()
    
class PostView(LoginRequiredMixin, CreateView):
    template_name = 'post.html'
    model = Post
    form_class = PostForm
    #fields = ('image','spot_name', 'country', 'address', 'free', 'parking', 'baby_station', 'other')
    success_url = reverse_lazy('posts:list')
    
class MyPageView(ListView):
    template_name = 'my_page.html'
    model = Post
    
    def get_queryset(self): 
       return Post.objects.filter(user=self.request.user)

class PostSearchView(LoginRequiredMixin, View):
    template_name = 'search.html' 
    model = Post

posts/forms.py
from django import forms
from .models import Post

class PostForm(forms.ModelForm):

  class Meta: 
    model = Post
    fields = ['image','spot_name','country','address','free','parking','baby_station','other']
    labels = [
      {"spot_name","施設名"},
      {"country","区"},
      {"address","以下住所"},
      {"free","料金"},
      {"parking","駐車場"},
      {"baby_station","赤ちゃん休憩室"},
      {"other","その他"}
    ]
    widgets = {
      'country': forms.Select(attrs={'class':'form-control'}),
      'image': forms.Select(attrs={'class':'form-control'}),
    }