[Fixed]-How to use can_add_related in Django Admin

by

21👍

✅

This is probably coming in late. But for other viewers reference, 

def get_form(self, request, obj=None, **kwargs):
    form = super(ProductAdmin, self).get_form(request, obj, **kwargs)
    form.base_fields['category'].widget.can_add_related = False
    return form
👤Mo J. Mughrabi

3👍

can_add_related seems to be an attribute on the widget, not the field, so try:

self.fields['person'].widget.can_add_related = False
👤Timmy O'Mahony

1👍

Alternative approach, with changing widget options *before* the form is instantiated:

class MyAdmin(django.contrib.admin.ModelAdmin):

    def formfield_for_dbfield(self, *args, **kwargs):
        formfield = super().formfield_for_dbfield(*args, **kwargs)
        if hasattr(formfield, "widget"):
            formfield.widget.can_add_related = False
            formfield.widget.can_delete_related = False
            formfield.widget.can_change_related = False
        else:
            pass  # this relation doesn't have an admin page to add/delete/change

        return formfield
👤Art

1👍

Another approach, if you are defining an Inline model and use it in your admin, would be to overwrite the get_formset method:

from django.contrib import admin


class MyModelInline(admin.TabularInline):
    model = MyModel
    extra = 0
    min_num = 1
    max_num = 10
    fields = [
        'some_field'
    ]

    def get_formset(self, request, obj=None, **kwargs):
        fs = super().get_formset(request, obj, **kwargs)
        fs.form.base_fields['some_field'].widget.can_add_related = False
        fs.form.base_fields['some_field'].widget.can_change_related = False
        fs.form.base_fields['some_field'].widget.can_delete_related = False
        return fs
👤babis21

0👍

For TabularInline you can combine the answer from @Art and @babis21:

We can use the @Art answer here as well using the following:

    def get_formset(self, request, obj=None, **kwargs):
        res = super().get_formset(request, obj=None, **kwargs)
        for formfield in res.form.base_fields.values():
            if hasattr(formfield, "widget"):
                formfield.widget.can_add_related = False
                formfield.widget.can_delete_related = False
                formfield.widget.can_change_related = False
        return res
👤kholioeg

0👍

I coded this mixin:

class AdminModelNoAddOrChangeForeignKeyMixin:
    # For admin.ModelAdmin
    def get_form(self, request, obj=None, **kwargs):
        form = super().get_form(request, obj, **kwargs)
        for field_name, field in form.base_fields.items():
            if isinstance(self.model._meta.get_field(field_name), ForeignKey):
                field.widget.can_add_related = False
                field.widget.can_change_related = False
        return form

    # For admin.TabularInline and admin.StackedInline
    def get_formset(self, request, obj=None, **kwargs):
        fs = super().get_formset(request, obj, **kwargs)
        for field_name, field in fs.form.base_fields.items():
            if isinstance(self.model._meta.get_field(field_name), ForeignKey):
                field.widget.can_add_related = False
                field.widget.can_change_related = False
        return fs

Works for all foreign key fields as mixin for Inline and ModelAdmin:

class MyInline(AdminModelNoAddOrChangeForeignKeyMixin, admin.TabularInline):
    whatever

class DigitalDistributionDataAdmin(AdminModelNoAddOrChangeForeignKeyMixin, admin.ModelAdmin):
    whatever
👤user1383029

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