RestPack/restpack-resource

require 'active_support/core_ext/hash/slice.rb'

module RestPack
  module Service
  
    def paged_resource(klass, params, options = {})
      options[:page] ||= params['page'].to_i if params['page']
      options[:includes] ||= extract_includes_from_params(params) unless params['includes'].nil?
      options[:sort_by] ||= params['sort_by'].to_sym if params['sort_by']
      options[:sort_direction] ||= params['sort_direction'].to_sym if params['sort_direction']
      
      filters = extract_filters_from_params(klass, params)
      options[:filters] ||= filters unless filters.empty?

      klass.paged_resource(options)
    end
    
    def single_resource(klass, params, options = {})      
      options[:id] ||= params['id'] if params['id']
      options[:includes] ||= extract_includes_from_params(params) unless params['includes'].nil?
      
      klass.single_resource(options)
    end
    
    private
  
    def extract_filters_from_params(klass, params)
      extracted = params.with_indifferent_access.extract!(*klass.resource_filterable_by)
      extracted.delete_if { |k, v| v.nil? }
    end
    
    def extract_includes_from_params(params)
      params['includes'].split(',').map {|i| i.to_sym }
    end
    
  end
end