openfoodnetwork/app/controllers/admin/standing_line_items_controller.rb

require 'open_food_network/permissions'
require 'open_food_network/order_cycle_permissions'

module Admin
  class StandingLineItemsController < ResourceController
    before_filter :load_build_context, only: [:build]

    respond_to :json

    respond_override destroy: { json: {
      success: lambda { render nothing: true, :status => 204 },
      failure: lambda { render json: { errors: @standing_line_item.errors.full_messages }, status: :unprocessable_entity }
    } }

    def build
      return render json: { errors: ['Unauthorised'] }, status: :unauthorized unless @shop
      if @variant
        @standing_line_item.assign_attributes(params[:standing_line_item])
        fee_calculator = OpenFoodNetwork::EnterpriseFeeCalculator.new(@shop, @order_cycle) if @order_cycle
        OpenFoodNetwork::ScopeVariantToHub.new(@shop).scope(@variant)
        render json: @standing_line_item, serializer: Api::Admin::StandingLineItemSerializer, fee_calculator: fee_calculator
      else
        render json: { errors: ["#{@shop.name} is not permitted to sell the selected product"] }, status: :unprocessable_entity
      end
    end

    private

    def permissions
      OpenFoodNetwork::Permissions.new(spree_current_user)
    end

    def load_build_context
      @shop = Enterprise.managed_by(spree_current_user).find_by_id(params[:shop_id])
      @schedule = permissions.editable_schedules.find_by_id(params[:schedule_id])
      @order_cycle = @schedule.andand.current_or_next_order_cycle
      @variant = Spree::Variant.stockable_by(@shop).find_by_id(params[:standing_line_item][:variant_id])
    end

    def new_actions
      [:new, :create, :build] # Added build
    end
  end
end