module Arel class InsertManager < Arel::TreeManager def initialize engine super @ast = Nodes::InsertStatement.new end def into table @ast.relation = table self end def columns; @ast.columns end def values= val; @ast.values = val; end def select select @ast.select = select end def insert fields return if fields.empty? if String === fields @ast.values = Nodes::SqlLiteral.new(fields) else @ast.relation ||= fields.first.first.relation values = [] fields.each do |column, value| @ast.columns << column values << value end @ast.values = create_values values, @ast.columns end end def create_values values, columns Nodes::Values.new values, columns end end end