Bring payment method controller from spree_backend

app/controllers/spree/admin/payment_methods_controller.rb

@@ -0,0 +1,65 @@
+module Spree
+  module Admin
+    class PaymentMethodsController < ResourceController
+      skip_before_filter :load_resource, :only => [:create]
+      before_filter :load_data
+      before_filter :validate_payment_method_provider, :only => :create
+
+      respond_to :html
+
+      def create
+        @payment_method = params[:payment_method].delete(:type).constantize.new(params[:payment_method])
+        @object = @payment_method
+        invoke_callbacks(:create, :before)
+        if @payment_method.save
+          invoke_callbacks(:create, :after)
+          flash[:success] = Spree.t(:successfully_created, :resource => Spree.t(:payment_method))
+          redirect_to edit_admin_payment_method_path(@payment_method)
+        else
+          invoke_callbacks(:create, :fails)
+          respond_with(@payment_method)
+        end
+      end
+
+      def update
+        invoke_callbacks(:update, :before)
+        payment_method_type = params[:payment_method].delete(:type)
+        if @payment_method['type'].to_s != payment_method_type
+          @payment_method.update_column(:type, payment_method_type)
+          @payment_method = PaymentMethod.find(params[:id])
+        end
+
+        payment_method_params = params[ActiveModel::Naming.param_key(@payment_method)] || {}
+        attributes = params[:payment_method].merge(payment_method_params)
+        attributes.each do |k,v|
+          if k.include?("password") && attributes[k].blank?
+            attributes.delete(k)
+          end
+        end
+
+        if @payment_method.update_attributes(attributes)
+          invoke_callbacks(:update, :after)
+          flash[:success] = Spree.t(:successfully_updated, :resource => Spree.t(:payment_method))
+          redirect_to edit_admin_payment_method_path(@payment_method)
+        else
+          invoke_callbacks(:update, :fails)
+          respond_with(@payment_method)
+        end
+      end
+
+      private
+
+      def load_data
+        @providers = Gateway.providers.sort{|p1, p2| p1.name <=> p2.name }
+      end
+
+      def validate_payment_method_provider
+        valid_payment_methods = Rails.application.config.spree.payment_methods.map(&:to_s)
+        if !valid_payment_methods.include?(params[:payment_method][:type])
+          flash[:error] = Spree.t(:invalid_payment_provider)
+          redirect_to new_admin_payment_method_path
+        end
+      end
+    end
+  end
+end