Class | Sequel::SQL::Expression |
In: |
lib/sequel/sql.rb
|
Parent: | Object |
Base class for all SQL expression objects.
Expression objects are assumed to be value objects, where their attribute values can‘t change after assignment. In order to make it easy to define equality and hash methods, subclass instances assume that the only values that affect the results of such methods are the values of the object‘s attributes.
# File lib/sequel/sql.rb, line 58 58: def self.attr_reader(*args) 59: super 60: comparison_attrs.concat args 61: end
Returns true if the receiver is the same expression as the the other expression.
# File lib/sequel/sql.rb, line 83 83: def eql?(other) 84: other.is_a?(self.class) && !self.class.comparison_attrs.find{|a| send(a) != other.send(a)} 85: end
Show the class name and instance variables for the object, necessary for correct operation on ruby 1.9.2.
# File lib/sequel/sql.rb, line 94 94: def inspect 95: "#<#{self.class} #{instance_variables.map{|iv| "#{iv}=>#{instance_variable_get(iv).inspect}"}.join(', ')}>" 96: end
Returns self, because SQL::Expression already acts like LiteralString.
# File lib/sequel/sql.rb, line 99 99: def lit 100: self 101: end