module DataTable module ActiveRecord module ClassMethods def _find_objects params, fields, search_fields self.where(_where_conditions params[:ssearch], search_fields). includes(_discover_joins fields). order(_order_fields params, fields). paginate :page => _page(params), :per_page => _per_page(params) end def _discover_joins fields joins = Set.new object = self.new fields.each { |it| field = it.split('.') if (field.size == 2) then next if object.class.name.downcase == field[0].singularize if object.respond_to?(field[0].to_sym) joins.add field[0].to_sym elsif object.respond_to?(field[0].singularize.to_sym) joins.add field[0].singularize.to_sym end end } joins.to_a end def _where_conditions query, search_fields, join_operator = "OR" return if query.blank? all_conditions = [] all_parameters = [] query.split.each do |term| conditions = [] parameters = [] search_fields.each do |field| next if (clause = _where_condition(term, field.dup)).empty? conditions << clause.shift parameters += clause end all_conditions << conditions all_parameters << parameters end [all_conditions.map {|conditions| "(" + conditions.join(" #{join_operator} ") + ")" }.join(" AND "), *all_parameters.flatten] end def _where_condition query, field return [] if query.blank? if field.is_a? Array options = field.extract_options! if options[:split] _split_where_condition query, field, options elsif options[:date] _date_where_condition query, field.first else _where_conditions(query, field, "AND") end else ["UPPER(#{field}) LIKE ?", "%#{query.upcase}%"] end end def _date_where_condition query, field begin ["#{field} = ?", Date.parse(query)] rescue ArgumentError [] end end def _split_where_condition query, fields, options conditions = [] parameters = [] split_query = query.split options[:split] types = options[:types] || ([:string] * fields.size) if split_query.size == fields.size fields.zip(split_query).zip(types).each do |((field, query), type)| if type == :numeric conditions << "#{field} = ?" parameters << query.to_i else conditions << "UPPER(#{field}) LIKE ?" parameters << "%#{query.upcase}%" end end ["(" + conditions.join(" AND ") + ")", *parameters] else [] end end def _order_fields params, fields direction = params[:ssortdir_0] == "asc" ? "ASC" : "DESC" %{#{fields[params[:isortcol_0].to_i]} #{direction}} end end end end