Refactor prices

#475

app/controllers/admin/billing/prices_controller.rb

@@ -0,0 +1,86 @@
+module Admin
+  module Billing
+    class PricesController < AdminController
+      authorize_resource(class: 'Billing::Price')
+      before_action :load_price, only: %i[edit update destroy]
+      helper_method :zones
+      helper_method :operation_categories
+      helper_method :durations
+
+      def index
+        @q = ::Billing::Price.search(params[:q])
+        @q.sorts = ['zone_id asc', 'duration asc', 'operation_category asc',
+                    'valid_from desc', 'valid_to asc'] if @q.sorts.empty?
+        @prices = @q.result.page(params[:page])
+      end
+
+      def new
+        @price = ::Billing::Price.new
+      end
+
+      def edit
+      end
+
+      def create
+        @price = ::Billing::Price.new(price_params)
+
+        if @price.save
+          flash[:notice] = t('.created')
+          redirect_to_index
+        else
+          render :new
+        end
+      end
+
+      def update
+        if @price.update_attributes(price_params)
+          flash[:notice] = t('.updated')
+          redirect_to_index
+        else
+          render :edit
+        end
+      end
+
+      def destroy
+        @price.destroy!
+        flash[:notice] = t('.destroyed')
+        redirect_to_index
+      end
+
+      private
+
+      def load_price
+        @price = ::Billing::Price.find(params[:id])
+      end
+
+      def price_params
+        allowed_params = %i[
+          zone_id
+          operation_category
+          duration
+          price
+          valid_from
+          valid_to
+        ]
+
+        params.require(:price).permit(*allowed_params)
+      end
+
+      def redirect_to_index
+        redirect_to admin_prices_url
+      end
+
+      def zones
+        ::DNS::Zone.all
+      end
+
+      def operation_categories
+        ::Billing::Price::operation_categories
+      end
+
+      def durations
+        ::Billing::Price::durations
+      end
+    end
+  end
+end