사용자 지정 필드에 쿼리 세트를 만드는 방법은 무엇입니까?

Question

아래 그림과 같이 두 개의 사용자 정의 필드가 있습니다.

사용자가 GET 요청을하면 오른쪽 목록에서 사용자의 사용 권한을 표시하고 싶습니다. 왼쪽 목록에서 아직 올바른 목록에없는 사용 권한을 표시하고 싶습니다. 내 사용자 정의 필드에 올바른 쿼리 세트를 만드는 방법은 무엇입니까? 나는 혼란 스럽다.

어떻게 생각합니까? available_permissions 필드에 쿼리 세트를 만들어야한다고 생각합니다. 의사 코드 :

for available_permission in Permission.objects.all() 
    if available_permission not in (QuerySet <user_permissions>) 
     Create new QuerySet with available_permission 

1) 사용자의 사용권 한을 알고 계십니까? 여기에서 사용자 ID를보기에서 양식으로 보내야한다고 생각합니다.

2) 빈 쿼리 세트를 작성하고 해당 쿼리 세트에 오브젝트를 추가하는 방법은 무엇입니까?

forms.py :

class UserEditForm(UserChangeForm): 
    available_permissions = forms.ModelMultipleChoiceField(
     widget=forms.SelectMultiple, 
     queryset=None, 
     required=False, 
    ) 

    current_permissions = forms.ModelMultipleChoiceField(
     widget=forms.SelectMultiple, 
     queryset=None, 
     required=False, 
    ) 

    def __init__(self, *args, **kwargs): 
     self.current_permissions = kwargs.pop('current_permissions') 
     self.available_permissions = kwargs.pop('available_permissions') 
     self.fields['current_permissions'].queryset = self.current_permissions 
     self.fields['available_permissions'].queryset = self.available_permissions 

views.py :

class UserEditView(UpdateView): 
    template_name = 'users/edit_user.html' 
    form_class = UserEditForm 
    model = User 

    def get(self, request, *args, **kwargs): 
     user = User.objects.get(pk=self.kwargs['pk']) 
     context = { 
     'user': user, 
     'user_edit_form': UserEditForm(
      instance=user, 
      current_permissions=user.get_all_permissions(), 
      available_permissions=Permission.objects.difference(user.user_permissions.all()), 
     ), 
     } 
     *** 

ERROR :

Traceback (most recent call last): 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner 
    response = get_response(request) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch 
    return handler(request, *args, **kwargs) 
    File "/Applications/Projects/web/dashboard.kase.kz/users/views.py", line 75, in get 
    data['html_form'] = render_to_string('users/edit_user.html', context, request=request) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/loader.py", line 68, in render_to_string 
    return template.render(context, request) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/backends/django.py", line 66, in render 
    return self.template.render(context) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/base.py", line 207, in render 
    return self._render(context) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/base.py", line 199, in _render 
    return self.nodelist.render(context) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/base.py", line 990, in render 
    bit = node.render_annotated(context) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/base.py", line 957, in render_annotated 
    return self.render(context) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/template/defaulttags.py", line 173, in render 
    len_values = len(values) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/boundfield.py", line 71, in __len__ 
    return len(self.subwidgets) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/utils/functional.py", line 35, in __get__ 
    res = instance.__dict__[self.name] = self.func(instance) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/boundfield.py", line 57, in subwidgets 
    for widget in self.field.widget.subwidgets(self.html_name, self.value(), attrs=attrs) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/boundfield.py", line 56, in <genexpr> 
    BoundWidget(self.field.widget, widget, self.form.renderer) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/widgets.py", line 561, in subwidgets 
    for option in self.options(name, value, attrs): 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/widgets.py", line 566, in options 
    for group in self.optgroups(name, value, attrs): 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/widgets.py", line 575, in optgroups 
    for index, (option_value, option_label) in enumerate(chain(self.choices)): 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/forms/models.py", line 1139, in __iter__ 
    for obj in queryset: 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/query.py", line 53, in __iter__ 
    results = compiler.execute_sql(chunked_fetch=self.chunked_fetch) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 871, in execute_sql 
    sql, params = self.as_sql() 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/backends/oracle/compiler.py", line 21, in as_sql 
    with_col_aliases=with_col_aliases, 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 430, in as_sql 
    result, params = self.get_combinator_sql(combinator, self.query.combinator_all) 
    File "/Users/nurzhan_nogerbek/Virtualenvs/py2714/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 389, in get_combinator_sql 
    raise DatabaseError('ORDER BY not allowed in subqueries of compound statements.') 
DatabaseError: ORDER BY not allowed in subqueries of compound statements. 

UNION : forms.py :

final_available_permissions = Permission.objects.none() 
for available_permission in Permission.objects.all(): 
    if available_permission not in self.current_permissions: 
     final_available_permissions = final_available_permissions.union(available_permission) 
self.fields['available_permissions'].queryset = final_available_permissions 

오류 UNION :

AttributeError: 'Permission' object has no attribute '_combinator_query' 

Answer 1

당신은 user.user_permissions.all() 및 Permission.objects.difference(user.user_permissions.all())에 의해 역으로 사용자의 권한을 얻을 수 있습니다. 그러나 그룹 권한을 고려한 경우 더 복잡한 작업을 수행해야합니다.

설치시 QuerySet.difference()에 문제가있어서 다른 해결책이 있습니다.

current_permissions = Permission.objects.filter(user=user) 
available_permissions = Permission.objects.exclude(user=user)