In Django Admin, I want to change how foreign keys are displayed in the Many-Many Relationship admin widget
I have a ManyToMany relationship:
class Book:
title = models.CharField (...)
isbn = models.CharField (...)
def unicode (self):
return self.title
def ISBN (self):
return self.isbn
class Author:
name = models.CharField (...)
books = models.ManyToManyField (Book ...)
In the admin interface for author, I get a multi-select list that uses the unicode screen for books. I want to change the list in two ways:
1) For the admin interface only, I want to display the ISBN, everywhere I just print the Book object. I want the title to be displayed.
2) How can I use a better widget than MultipleSelectList for ManyToMany. How can I specify the use of CheckBoxSelectList instead?
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For 2) use this in your AuthorAdmin class:
raw_id_fields = ['books']
Check here: http://docs.djangoproject.com/en/dev/ref/contrib/admin/#ref-contrib-admin for instructions on how to create a custom ModelAdmin class. I've thought about this a lot for my own Django project and I think 1) will need to change the admin template to view Author objects.
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To display the ISBN, you can create a custom field as follows:
class BooksField(forms.ModelMultipleChoiceField):
def label_from_instance(self, obj):
return obj.isbn
There have CheckboxSelectMultiple for a ManyToManyField, but it does not appear correctly for the administrator, so you can also write css to fix it.
You need to create a form for the model and use it in your admin class:
class AuthorForm(forms.ModelForm):
books = BooksField(Book.objects.all(), widget=forms.CheckboxSelectMultiple)
class Meta:
model = Author
class Media:
css = {
'all': ('booksfield.css',)
}
class AuthorAdmin(admin.ModelAdmin):
form = AuthorForm
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