Django Admin ManyToManyField

Question

I've made a model (models.py):

class opetest(models.Model):     name = models.CharField(max_length=200)     author = models.ForeignKey(User, related_name='author')     description = models.TextField(u'Test description', help_text = u'Some words about quiz')     pub_date = models.DateTimeField('date published', blank=False)     vacancies = models.ManyToManyField(Vacancy, blank=True)     students = models.ManyToManyField(User, blank=True, related_name='opetests') #This field I want to edit on "User change page"     estimate = models.IntegerField(default = 0, help_text = u'Estimate time in hours. \'0\' - unlimited') 

then I try to add inline block to allow assign opetest on 'change user' page (admin.py):

class ProfileAdmin(UserAdmin):     filter_horizontal = ('opetests',)  admin.site.unregister(User) admin.site.register(User, ProfileAdmin) 

And I got an error:

'ProfileAdmin.filter_horizontal' refers to field 'opetests' that is missing from model 'User'. 

I want to show opetests like Groups on change user page. How can I achieve that?

Answer 1

Hmm, I don't think you want inlines here.

You want to be using the Django admin's filter_horizontal:

https://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.filter_horizontal

class ProfileAdmin(UserAdmin)     filter_horizontal = ('opetest',) 

That will give you the widget that you're describing, used to add/remove Groups on the User Change page.

---

Ok, based on your edits, updated answer - basically, what we have is a UserProfile, linked to each user.

The UserProfile contains a m2m relationship to opetest - which we show in the admin with a filter_horizontal. End result is something like this:

models.py

from django.db import models from django.contrib.auth.models import User  class opetest(models.Model):     name = models.CharField(max_length=200)     author = models.ForeignKey(User, related_name='author')     description = models.TextField(u'Test description', help_text = u'Some words about quiz')     pub_date = models.DateTimeField('date published', blank=False)     #vacancies = models.ManyToManyField(Vacancy, blank=True)     students = models.ManyToManyField(User, blank=True, related_name='opetests') #This field I want to edit on "User change page"     estimate = models.IntegerField(default = 0, help_text = u'Estimate time in hours. \'0\' - unlimited')  class UserProfile(models.Model):     user = models.OneToOneField(User, unique=True)     ope = models.ManyToManyField(opetest)     test_flag = models.BooleanField() 

admin.py

from django.contrib import admin from django.contrib.auth.admin import UserAdmin from django.contrib.auth.models import User from secondapp.models import UserProfile, opetest  admin.site.unregister(User)  class opetestAdmin(admin.ModelAdmin):     pass  class UserProfileInline(admin.StackedInline):     model = UserProfile     filter_horizontal = ('ope',)  class CustomUserAdmin(UserAdmin):     #filter_horizontal = ('user_permissions', 'groups', 'ope')     save_on_top = True     list_display = ('username', 'email', 'first_name', 'last_name', 'is_staff', 'last_login')     inlines = [UserProfileInline]  admin.site.register(User, CustomUserAdmin) admin.site.register(opetest, opetestAdmin) 

Let me know if you have any questions, or need anything further.