Class | Sequel::SQL::Expression |
In: |
lib/sequel/extensions/eval_inspect.rb
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 68 68: def self.attr_reader(*args) 69: super 70: comparison_attrs.concat(args) 71: end
Returns true if the receiver is the same expression as the the other expression.
# File lib/sequel/sql.rb, line 94 94: def eql?(other) 95: other.is_a?(self.class) && !self.class.comparison_attrs.find{|a| send(a) != other.send(a)} 96: end
Attempt to produce a string suitable for eval, such that:
eval(obj.inspect) == obj
# File lib/sequel/extensions/eval_inspect.rb, line 60 60: def inspect 61: # Assume by default that the object can be recreated by calling 62: # self.class.new with any attr_reader values defined on the class, 63: # in the order they were defined. 64: klass = self.class 65: args = inspect_args.map do |arg| 66: if arg.is_a?(String) && arg =~ /\A\*/ 67: # Special case string arguments starting with *, indicating that 68: # they should return an array to be splatted as the remaining arguments 69: send(arg.sub('*', '')).map{|a| Sequel.eval_inspect(a)}.join(', ') 70: else 71: Sequel.eval_inspect(send(arg)) 72: end 73: end 74: "#{klass}.new(#{args.join(', ')})" 75: 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 105 105: def inspect 106: "#<#{self.class} #{instance_variables.map{|iv| "#{iv}=>#{instance_variable_get(iv).inspect}"}.join(', ')}>" 107: end
Returns self, because SQL::Expression already acts like LiteralString.
# File lib/sequel/sql.rb, line 110 110: def lit 111: self 112: end