Add dynamic field to django admin model form

Question

I need to add the field with link to the model view on my site to the django admin view. When I add field name to the list_display and define method for rendering this url:

class SetAdmin(admin.ModelAdmin):
    list_display = ['many other fields', 'show_set_url']

    def show_set_url(self, obj):
            return '<a href="#">Set</a>' # render depends on other fields

It shows in Sets list in django admin, but not in model form. How can I fix this and add link to the Sets Form in django admin?

I've tried also to create custom form for this model:

from core.models import Set
from django import forms

class SetAdminForm(forms.Form):
    class Meta:
        model = Set

    def __init__(self, *args, **kwargs):
        super(SetAdminForm, self).__init__(*args, **kwargs)
        self.fields['foo'] = forms.IntegerField(label=u"Link")

But there is now visible effect in form.

Answer 1

You can accomplish what you're trying by overriding ModelAdmin but you also need to override ModelAdmin.get_fieldsets. This answer might help you out. The OP in the link has a similar problem as well.

Edit: If you don't want an editable field you can try overriding ModelAdmin.get_readonly_fields. Also check here for more attributes to override.

Answer 2

You can create dynamic fields and fieldset using the form meta class. Sample code is given below. Add the loop logic as per you requirements.

class CustomAdminFormMetaClass(ModelFormMetaclass):
    """
    Metaclass for custom admin form with dynamic field
    """
    def __new__(cls, name, bases, attrs):
        for field in myloop: #add logic to get the fields
            attrs[field] = forms.CharField(max_length=30) #add logic to the form field
        return super(CustomAdminFormMetaClass, cls).__new__(cls, name, bases, attrs)


class CustomAdminForm(six.with_metaclass(CustomAdminFormMetaClass, forms.ModelForm)):
    """
    Custom admin form
    """

    class Meta:
        model = ModelName
        fields = "__all__" 


class CustomAdmin(admin.ModelAdmin):
    """
    Custom admin 
    """

    fieldsets = None
    form = CustomAdminForm

    def get_fieldsets(self, request, obj=None):
        """
        Different fieldset for the admin form
        """
        self.fieldsets = self.dynamic_fieldset(). #add logic to add the dynamic fieldset with fields
        return super(CustomAdmin, self).get_fieldsets(request, obj)

    def dynamic_fieldset(self):
        """
        get the dynamic field sets
        """
        fieldsets = []
        for group in get_field_set_groups: #logic to get the field set group
            fields = []
            for field in get_group_fields: #logic to get the group fields
                fields.append(field)

            fieldset_values = {"fields": tuple(fields), "classes": ['collapse']}
            fieldsets.append((group, fieldset_values))

        fieldsets = tuple(fieldsets)

        return fieldsets