ActiveModel::ForbiddenAttributesError in-spite of params.require(:model).permit

Question

I have a model for which I am permitting all updates for an admin user.

This is the relevant code in the controller and model :

      private:
      class ModelsController < ApplicationController
        def model_params
          params.require(:model).permit! if current_user.admin?
        end

        def update
           @model = Model.find(params[:id])

          respond_to do |format|
           if @model.update_attributes(model_params)
             format.html { redirect_to @model, notice: 'model was successfully updated.' }
             format.json { head :no_content }
           else
             format.html { render action: "edit",flash:          
             {error:@model.errors.full_messages.join(', ')} }
             format.json { render json: @model.errors, status: :unprocessable_entity }
           end
         end
        end
      end

      class Model < ActiveRecord::Base
        include ActiveModel::ForbiddenAttributesProtection
      end 

However, when I update attributes from the active admin edit page, I still get the ActiveModel::ForbiddenAttributesError

Relevant Gems: Rails4, Ruby2.0, activeadmin

Answer 1

Turns out I have to permit params independently for active admin like this

ActiveAdmin.register Model do
  controller do
    def permitted_params
      params.permit!
    end
  end
end

Answer 2

I had the same problem. You can also specify which fields is permitted.

ActiveAdmin.register Post do
  permit_params :title, :content
end