Contents

# frozen_string_literal: true

module Motor
  module ApiQuery
    module Sort
      FIELD_PARSE_REGEXP = /\A(-)?(.*)\z/.freeze

      module_function

      def call(rel, param)
        return rel if param.blank?

        arel_order = build_arel_order(rel.klass, param)
        join_params = build_join_params(rel.klass, param)

        rel.order(arel_order).left_joins(join_params)
      end

      def build_join_params(_model, param)
        param.split(',').each_with_object({}) do |field, result|
          key = field[FIELD_PARSE_REGEXP, 2]
          *path, _ = key.split('.')

          path.reduce(result) do |acc, fragment|
            hash = {}

            acc[fragment] = hash

            hash
          end
        end
      end

      def build_arel_order(model, param)
        param.split(',').map do |field|
          direction, key = field.match(FIELD_PARSE_REGEXP).captures
          *path, field = key.split('.')

          reflection_model =
            path.reduce(model) do |acc, fragment|
              acc.reflections[fragment].klass
            end

          arel_column = reflection_model.arel_table[field]

          direction.present? ? arel_column.desc : arel_column.asc
        end
      end
    end
  end
end

Version data entries

8 entries across 8 versions & 1 rubygems

Version	Path
motor-admin-0.1.36	lib/motor/api_query/sort.rb
motor-admin-0.1.35	lib/motor/api_query/sort.rb
motor-admin-0.1.34	lib/motor/api_query/sort.rb
motor-admin-0.1.33	lib/motor/api_query/sort.rb
motor-admin-0.1.32	lib/motor/api_query/sort.rb
motor-admin-0.1.31	lib/motor/api_query/sort.rb
motor-admin-0.1.29	lib/motor/api_query/sort.rb
motor-admin-0.1.28	lib/motor/api_query/sort.rb