Use raw_id_fields so that the admin loads
@@ -195,6 +195,7 @@ class FeatureAdmin(admin.ModelAdmin):
search_fields = ('feature_id',)
filter_horizontal = ('projects',)
readonly_fields = ('add_date',)
+ raw_id_fields = ('projects',)
def project_count(self, feature):
return feature.projects.count()
