method

safe_constantize

v6.0.0 - 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.

safe_constantize('Module')   # => Module
safe_constantize('Foo::Bar') # => Foo::Bar

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'
  safe_constantize('C') # => 'outside', same as ::C
end

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

safe_constantize('blargle')                  # => nil
safe_constantize('UnknownModule')            # => nil
safe_constantize('UnknownModule::Foo::Bar')  # => nil

Show source

# File activesupport/lib/active_support/inflector/methods.rb, line 324
    def safe_constantize(camel_cased_word)
      constantize(camel_cased_word)
    rescue NameError => e
      raise if e.name && !(camel_cased_word.to_s.split("::").include?(e.name.to_s) ||
        e.name.to_s == camel_cased_word.to_s)
    rescue ArgumentError => e
      raise unless /not missing constant #{const_regexp(camel_cased_word)}!$/.match?(e.message)
    rescue LoadError => e
      raise unless /Unable to autoload constant #{const_regexp(camel_cased_word)}/.match?(e.message)
    end

safe_constantize

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