base_search_resolver.rb

require 'search_object'
require 'search_object/plugin/graphql'

module Resolvers
  class BaseSearchResolver
    include ::SearchObject.module(:graphql)

    ORDER_BY_DIRECTION_INPUT = begin 
      Class.new(Types::BaseEnum) do
        graphql_name "OrderByDirection"
        
        %w(desc asc).map { |e|
          value e.upcase, value: e
        }
      end
    end
  
    scope { [] }
    
    def self.add_order_by_for(klass)
      input = create_order_by_input(klass)
      option(:order_by, type: input) { |scope, value| 
        if value
          value = value.to_h
          scope.order("#{value[:field]} #{value[:direction]}")
        end
      }
    end
     
    private
    def self.create_order_by_input klass
      fields = Class.new(Types::BaseEnum) do
        graphql_name "#{klass}OrderByField"
        klass.attribute_names.map { |e|
          value e.upcase, value: e
        }
      end

      input = Class.new(Types::BaseInputObject) do
        argument :field, fields, required: true
        argument :direction, ORDER_BY_DIRECTION_INPUT, required: true
        graphql_name "#{klass}OrderByInput"

      end
      input
    end
  end
end