Django: disable inline option to add new referenced objects
The Django Web Framework makes it quite easy to add new referenced objects in the admin menu.
Let's say the model has two foreign keys in it:
class TeamMember(models.Model):
team = models.ForeignKey(Team, on_delete=models.CASCADE, verbose_name=_("Team"))
user = models.ForeignKey(CustomUser, on_delete=models.CASCADE, verbose_name=_("User"))
And the admin form:
class TeamMemberForm(forms.ModelForm):
class Meta:
model = TeamMember
class CustomTeamMemberAdmin(admin.ModelAdmin):
form = TeamMemberForm
add_form = TeamMemberForm
model = TeamMember
fieldsets = [
(None, {'fields': ['team', 'user']}),
]
admin.site.register(TeamMember, CustomTeamMemberAdmin)
Then Django will show small a small green "
" sign next to the fields:
However that is not always desirable. In my use case I want a clear separation between changing teams, and changing team members. Note: this can't be resolved with permissions (removing the permissions for one one model will remove the "add" option, but that's not what I want - I still want permissions for both, just separate the actions).
Django makes it easy to remove the option to add new references inline in this form. In order to do that, the "ModelAdmin" must be extended by a "get_form()" function:
class CustomTeamMemberAdmin(admin.ModelAdmin):
form = TeamMemberForm
add_form = TeamMemberForm
model = TeamMember
fieldsets = [
(None, {'fields': ['team', 'user']}),
]
# disable green "+" buttons to add new objects in foreign table
def get_form(self, request, obj=None, **kwargs):
form = super(CustomTeamMemberAdmin, self).get_form(request, obj, **kwargs)
form.base_fields['team'].widget.can_add_related = False
form.base_fields['user'].widget.can_add_related = False
return form
In this function, the widgets for the two fields have an extra "can_add_related" option set to "False". That is enough to disable this option.
By the way: the same way the "add new reference" option can be disabled, it is also possible to disable the "edit" and "delete" options:
- widget.can_change_related will disable the "edit" button
- widget.can_delete_related will disable the "delete" button
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