Hide Inline form in Django

My Django ModelAdmin shows different forms in dependency on user permissions. I've solved it with ModelForm's (get_form, get_fieldsets), but what to do with inlines?

class NewsAdmin(admin.ModelAdmin):
    form = NewsAdminForm
    writing_form = 开发者_如何学JAVANewsWritingForm

    inlines = (LinkInline, FileInline)

ModelAdmin initializes them in ModelAdmin.__init__() before getting request object. The only way seems to use CSS to hide them.

You can use ModelAdmin get_inline_instances function. Following code removes inlines from add_view:

from django.contrib import admin
from models import FooModel

class FooInline(admin.StackedInline):
    model = FooModel

class MyModelAdmin(admin.ModelAdmin):
    inlines = [FooInline]

    def get_inline_instances(self, request, obj=None):
        return obj and super(MyModelAdmin, self).get_inline_instances(request, obj) or []

ModelAdmin.__init__() takes the classes in ModelAdmin.inlines, instantiates them, and stores the results in ModelAdmin.inline_instances. You can set ModelAdmin.inline_instances to an empty list after __init__ to remove the inlines.

See line 243 of django/contrib/admin/options.py

I solved this by putting the logic to set self.inline_instances = [] in the get_readonly_fields(self, request, obj=None) method.

For example, if you wanted to show the inlines to superusers but not to anyone else:

def get_readonly_fields(self, request, obj=None):
    if request.user.is_superuser:
        return ()
    else:
        self.inline_instances = []
        return ()

I used bskinner's trick to hide inlines when adding a new object, with two adjustments: First, I had to overwrite "inlines", not "inline_instances", and second, make sure you always return self.readonly_fields, to make sure you are preserving those when they are set.

def get_readonly_fields(self, request, obj=None):
    if obj: 
        # edit mode... add fields here to make them read-only when editing
        return self.readonly_fields
    else:
        self.inlines = []
        return self.readonly_fields