module ActiveSupport::Inflector

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

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

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

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

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

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

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 LoadError => e
  message = e.respond_to?(:original_message) ? e.original_message : e.message
  raise unless /Unable to autoload constant #{const_regexp(camel_cased_word)}/.match?(message)
end