Admin form inheritance

admin.py

from django import forms
from django.contrib import admin
from fieldlevel.admin import FieldLevelAdmin
from mptt.admin import MPTTModelAdmin
from content.models import Article, Section, Review

class ArticleForm(forms.ModelForm):
    model = Article
    class Media:
        js = (
            '/static/js/jquery-latest.js',
            '/static/js/article-admin.js',
        )

class ArticleAdmin(FieldLevelAdmin):
    fieldsets = [
        (None,                  {'fields': ['title','slug','summary','bullets','body']}),
        ('Multimedia',          {'fields': ['main_image','main_image_credit']}),
        ('Publishing settings', {'fields': ['pub_date','pub_status','sites']}),
        ('Taxonomy',            {'fields': ['tags','section']}),
        ('Author information',  {'fields': ['authors','authors_extra']})
    ]
    list_filter = ['pub_date']
    # form = ArticleForm
    def publish(self, request, queryset):
        rows_updated = queryset.update(pub_status='P')
        if rows_updated == 1:
            message_bit = "1 story was"
        else:
            message_bit = "%s stories were" % rows_updated
        self.message_user(request, "%s successfully published." % message_bit)
    publish.short_description = "Publish selected stories"
    def can_change_field(self, request, obj, field_name):
        if field_name == "pub_status":
            if not request.user.is_superuser:
                return False
        return True
    
    class Meta:
        abstract = True

class ReviewAdmin(ArticleAdmin):
   #form = ReviewForm
    fieldsets = ArticleAdmin.fieldsets.insert(1,
        ('Review fields',       {'fields': ['rating']}),
    )

admin.site.register(Article,ArticleAdmin)
admin.site.register(Review,ReviewAdmin)
admin.site.register(Section, MPTTModelAdmin)