method

safe_constantize

v4.1.8 - Show latest stable - 0 notes - Class: ActiveSupport::Inflector

safe_constantize(camel_cased_word) public

Tries to find a constant with the name specified in the argument string.

'Module'.safe_constantize     # => Module
'Test::Unit'.safe_constantize # => Test::Unit

The name is assumed to be the one of a top-level constant, no matter whether it starts with “::” or not. No lexical context is taken into account:

C = 'outside'
module M
  C = 'inside'
  C                    # => 'inside'
  'C'.safe_constantize # => 'outside', same as ::C
end

nil is returned when the name is not in CamelCase or the constant (or part of it) is unknown.

'blargle'.safe_constantize  # => nil
'UnknownModule'.safe_constantize  # => nil
'UnknownModule::Foo::Bar'.safe_constantize  # => nil

Show source

# File activesupport/lib/active_support/inflector/methods.rb, line 279
    def safe_constantize(camel_cased_word)
      constantize(camel_cased_word)
    rescue NameError => e
      raise unless e.message =~ /(uninitialized constant|wrong constant name) #{const_regexp(camel_cased_word)}$/ ||
        e.name.to_s == camel_cased_word.to_s
    rescue ArgumentError => e
      raise unless e.message =~ /not missing constant #{const_regexp(camel_cased_word)}\!$/
    end

safe_constantize

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