Class: Symbol

Inherits:
Object
  • Object
show all
Defined in:
lib/symbolize.rb

Overview

The Symbol class is extended by method quoted_id which returns a string. The idea behind this is, that symbols are converted to plain strings when being quoted by ActiveRecord::ConnectionAdapters::Quoting#quote. This makes it possible to work with symbolized attibutes in sql conditions. E.g. validates_uniqueness_of could not use :scope with a symbolized attribute, because AR quotes it to YAML:

"... AND status = '--- :active\n'"

Having support for quoted_id in Symbol, makes AR quoting symbols correctly:

"... AND status = 'active'"

NOTE: Normally quoted_id should be implemented as a singleton method

only used on symbols returned by read_and_symbolize_attribute,
but unfortunately this is not possible since Symbol is an immediate
value and therefore does not support singleton methods.

Instance Method Summary collapse

Instance Method Details

#quoted_id ⇒ Object 



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# File 'lib/symbolize.rb', line 193

def quoted_id
  # A symbol can contain almost every character (even a backslash or an
  # apostrophe), so make sure to properly quote the string value here.
  "'#{ActiveRecord::Base.connection.quote_string(self.to_s)}'"
end