Django Admin 实现外键过滤的方法

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> import django
> print(django.get_version())
2.0.1
>

# admin.py
@admin.register(Score)
class ScoreConfigAdmin(FilterUserAdmin):
  # fields = ('id','name')
  form = ScoreConfigAdminForm

  def get_changeform_initial_data(self, request):
    initial = super().get_changeform_initial_data(request)
    initial.update({'uid': request.user.id})
    return initial

# forms.py
class ScoreConfigAdminForm(forms.ModelForm):
  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    if not kwargs.get('initial'):
      return
    self.uid = kwargs.get('initial').get('uid')

  class Meta:
    model = Score
    fields = '__all__'

from django.contrib.auth.models import User
from django.db import models

class Blog(models.Model):
  '''
  Blog
  '''
  id = models.AutoField(unique=True, primary_key = True, verbose_name="序号")
  name = models.CharField(max_length=255, blank=True, null=True, verbose_name="名称")
  user = models.ForeignKey(User, on_delete=models.CASCADE)
  create_time = models.DateTimeField(verbose_name='添加时间', auto_now_add=True, blank=True)

  class Meta:
    verbose_name = 'Blog'
    verbose_name_plural = 'Blog管理'

  def __str__(self):
    return self.name

class Post(models.Model):
  '''
  Post 内容
  '''
  id = models.AutoField(unique=True, primary_key = True, verbose_name="序号")
  title = models.CharField(max_length=255, blank=True, null=True, verbose_name="标题")
  content = models.TextField(max_length=1024, blank=True, null=True, verbose_name="内容")
  blog = models.ForeignKey(Blog, on_delete=models.CASCADE, verbose_name="所属Blog")
  user = models.ForeignKey(User, on_delete=models.CASCADE)
  create_time = models.DateTimeField(verbose_name='添加时间', auto_now_add=True, blank=True)

  class Meta:
    verbose_name = '文章'
    verbose_name_plural = '文章管理'

  def __str__(self):
    return self.title

from django.contrib import admin
from django import forms

# Register your models here.
from django_summernote.admin import SummernoteModelAdmin
from .models import Team, Member, Activity, Score



from .models import Blog, Post
class FilterUserAdmin(admin.ModelAdmin):
  '''
  按所属用户过滤的 base, class
  '''
  def save_model(self, request, obj, form, change):
    # TODO 需要考虑不同用户对同一数据进行修改。
    obj.user = request.user
    obj.save()

  def get_queryset(self, request):
    # For Django < 1.6, override queryset instead of get_queryset
    qs = super(FilterUserAdmin, self).get_queryset(request) 
    # 不能加这个，加了这个会导致 superuser 更新普通用户的数据。
    # if request.user.is_superuser:
    #   return qs
    return qs.filter(user=request.user)

  def has_change_permission(self, request, obj=None):
    has_class_permission = super(FilterUserAdmin, self).has_change_permission(request, obj)
    if not has_class_permission:
      return False
    if obj is not None and not request.user.is_superuser and request.user.id != obj.user.id:
      return False
    return True


class BlogConfigAdmin(FilterUserAdmin):
  list_display = ('id','name', 'create_time')
  exclude = ['user']
  list_per_page = 50

admin.site.register(Blog, BlogConfigAdmin)


class PostConfigAdmin(FilterUserAdmin):
  list_display = ('id','title', 'create_time')
  exclude = ['user']
  list_per_page = 50

  def render_change_form(self, request, context, add=False, change=False, form_url='', obj=None):
    # 新增 Post 时，相关联的 Blog 需要过滤，关键就在下面这句。
    context['adminform'].form.fields['blog'].queryset = Team.objects.filter(user=request.user)
    return super(MemberConfigAdmin, self).render_change_form(request, context, add, change, form_url, obj)


admin.site.register(Post, PostConfigAdmin)