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?

Plunger

If the answer below answered your question, can you please tick it? If it didn't, please let us know what else you need, and we can try and help. – Yousuf

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.

Yousuf

filter_horizontal parameters should refer to model fields. But opetest here is a model. – Plunger

Hmm, why don't you create the opetest field on UserProfile, and have that map to opetest? It's a m2m field, so it shouldn't really matter which end of the relationship it's on - then you can just use filter_horizontal on the opetest field? – Yousuf

Sorry Victor, can you please describe, how can I create field on UserProfile and map it to opetest? – Plunger

So, I've added field but it doesn't work: 'class ProfileAdmin(UserAdmin):' 'usertests = models.ManyToManyField(opetest, blank=True)' 'ProfileAdmin.filter_horizontal' refers to field 'usertests' that is missing from model 'User'.' filter_horizontal = ('usertests',) – Plunger

Hmm, can you edit your question, and paste your full models.py and admin.py please? I'm a bit confused about the previous text, as you have class ProfileADmin(UserAdmin), which looks like admin.py, but then in the next line you define a model field. If you paste your full code, we can help you get it working easier. – Yousuf

it was an experiment because I don't know how to add field "on the fly" on ProfileADmin. Can you help me? So, I have 'start' models and rolled back the changes. – Plunger

@baobee: What do you mean by "on the fly"? Do you mean dynamically at run-time? confused. If you paste your source code, and what you're trying to achieve, we may be able to help you more =). – Yousuf

Can it be used outside of django admin? I wanted to use it in an intermediate view I created which technically isn't an official admin view, I just add the url in get_urls. – Wortham