所以我有一个用户可以发帖的社交网络。我想将博客系统整合到同一个feed应用中，而不是将博客作为自己的应用。我在想如果我（或者有足够权限的人）想要发布博客帖子，他们可以使用每个人用来发帖子的相同表格，但是由于他们有更高的权限，他们会在表格上看到一个额外的选项允许他们把它作为博客文章。在博客页面上，我只是过滤掉只有blog_post设置为true才能显示的帖子。
我尝试使用forms.py中的简单if语句执行此操作但是我收到错误：
Traceback (most recent call last):
File "/anaconda/envs/test/lib/python3.6/site-packages/django/utils/autoreload.py", line 228, in wrapper
fn(*args, **kwargs)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/management/commands/runserver.py", line 125, in inner_run
self.check(display_num_errors=True)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/management/base.py", line 359, in check
include_deployment_checks=include_deployment_checks,
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/management/base.py", line 346, in _run_checks
return checks.run_checks(**kwargs)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/checks/registry.py", line 81, in run_checks
new_errors = check(app_configs=app_configs)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/checks/urls.py", line 16, in check_url_config
return check_resolver(resolver)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/core/checks/urls.py", line 26, in check_resolver
return check_method()
File "/anaconda/envs/test/lib/python3.6/site-packages/django/urls/resolvers.py", line 254, in check
for pattern in self.url_patterns:
File "/anaconda/envs/test/lib/python3.6/site-packages/django/utils/functional.py", line 35, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/urls/resolvers.py", line 405, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/utils/functional.py", line 35, in __get__
res = instance.__dict__[self.name] = self.func(instance)
File "/anaconda/envs/test/lib/python3.6/site-packages/django/urls/resolvers.py", line 398, in urlconf_module
return import_module(self.urlconf_name)
File "/anaconda/envs/test/lib/python3.6/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 978, in _gcd_import
File "<frozen importlib._bootstrap>", line 961, in _find_and_load
File "<frozen importlib._bootstrap>", line 950, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 678, in exec_module
File "<frozen importlib._bootstrap>", line 205, in _call_with_frames_removed
File "/Users/garrettlove/Desktop/evverest/evverest/urls.py", line 20, in <module>
from feed import views
File "/Users/garrettlove/Desktop/evverest/feed/views.py", line 4, in <module>
from feed.forms import PostForm,CommentForm
File "/Users/garrettlove/Desktop/evverest/feed/forms.py", line 7, in <module>
class PostForm(forms.ModelForm):
File "/anaconda/envs/test/lib/python3.6/site-packages/django/forms/models.py", line 248, in __new__
"needs updating." % name
django.core.exceptions.ImproperlyConfigured: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is prohibited; form PostForm needs updating.
forms.py：
from django.contrib.auth import get_user_model
User = get_user_model()
class PostForm(forms.ModelForm):
class Meta:
model = UserPost
if User.username == 'garrett':
fields = ('title','image','post_body','blog_post')
else:
fields = ('title','image','post_body')
widget = {
'title':forms.TextInput(attrs={'class':'post-title'}),
'post_body':forms.Textarea(attrs={'class':'post-body'}),
}
models.py：
from django.contrib.auth import get_user_model
User = get_user_model()
# Create your models here.
class UserPost(models.Model):
author = models.ForeignKey(User,related_name='userpost',null=True)
post_date = models.DateTimeField(auto_now_add=True)
title = models.CharField(max_length=150,blank=False)
post_body = models.TextField(max_length=1000,blank=False)
image = models.ImageField(upload_to='post_pics',blank=True)
blog_post = models.BooleanField(default=False)
class Meta:
ordering = ['-post_date']
def publish(self):
self.save()
def get_absolute_url(self):
return reverse('index')
def __str__(self):
return self.title
Views.py：
from django.shortcuts import render,get_object_or_404,redirect
from django.utils import timezone
from feed.models import UserPost,UserComment
from feed.forms import PostForm,CommentForm
from django.urls import reverse_lazy
from django.contrib.auth.decorators import login_required
from django.contrib.auth import get_user_model
from django.contrib.auth.mixins import LoginRequiredMixin
from braces.views import SelectRelatedMixin
from django.views.generic import (TemplateView,ListView,
DetailView,CreateView,
UpdateView,DeleteView)
User = get_user_model()
# Create your views here.
##Posts Views
class HomeView(LoginRequiredMixin,ListView):
login_url = 'account_login'
model = UserPost
class CreatePostView(LoginRequiredMixin,CreateView):
login_url = 'users:user_login'
redirect_field_name = '/userpost_list.html'
model = UserPost
form_class = PostForm
def form_valid(self,form):
form.instance.author = self.request.user
self.object = form.save(commit=False)
self.object.user = self.request.user
self.object.save()
return super(CreatePostView, self).form_valid(form)
class PostDetailView(DetailView):
model = UserPost
post_comments = UserComment.objects.all()
context = {
'post':model,
'comments':post_comments,
}
class UpdatePostView(LoginRequiredMixin,UpdateView):
login_url = '/login/'
model = UserPost
fields = [
'title',
'post_body',
]
template_name_suffix = '_edit_form'
def get_success_url(self):
postid = self.kwargs['pk']
return reverse_lazy('index')
@login_required
def DeletePost(request,pk):
post = get_object_or_404(UserPost,pk=pk)
post.delete()
return redirect('index')
##Comments Views
@login_required
def add_comment_to_post(request,pk):
post = get_object_or_404(UserPost,pk=pk)
if request.method == 'POST':
form = CommentForm(request.POST)
if form.is_valid():
comment = form.save(commit=False)
comment.post = post
comment.author = request.user
comment.save()
return redirect('feed:post_detail', pk=post.pk)
else:
form = CommentForm()
return render(request,'feed/comment_form.html',{'form':form})
@login_required
def comment_remove(request,pk):
comment = get_object_or_404(UserComment,pk=pk)
post_pk = comment.post.pk
comment.delete()
return redirect('feed:post_detail',pk=post_pk)
##BLOG VIEWS
class BlogView(ListView):
model = UserPost
答案 0 :(得分：2)
需要将用户添加到kwargs：
class CreatePostView(LoginRequiredMixin,CreateView):
# Your code here
def get_form_kwargs(self):
kwargs = super(CreatePostView, self).get_form_kwargs()
kwargs.update({'user': self.request.user})
return kwargs
使用__init__方法后（我用Daniel解决方案更正）
class PostForm(forms.ModelForm):
class Meta:
model = UserPost
fields = ('title','image','post_body','blog_post')
def __init__(self, *args, **kwargs):
user = kwargs.pop('user')
super(PostForm, self).__init__(*args, **kwargs)
if not user.username == 'garrett':
self.fields.pop('blog_post')
答案 1 :(得分：2)
这不可能以这种方式运作。在定义类之前，在有任何用户之前很久就会对此进行评估。 User是类本身，而不是它的实例; User.username只是一个CharField对象，而不是实际的用户名。
相反，您需要将完整的字段列表设置为默认值，但在表单的__init__方法中，您可以获取当前用户并根据需要修改实际字段。
class PostForm(forms.ModelForm):
class Meta:
model = UserPost
fields = ('title','image','post_body','blog_post')
def __init__(self, *args, **kwargs):
user = kwargs.pop('user')
super(PostForm, self).__init__(*args, **kwargs)
if user.username != 'garrett'
del self.fields['blog_post']