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NameError

Methods

M

• missing_name,
• missing_name?

Extract the name of the missing constant from the exception message.

begin
  HelloWorld
rescue NameError => e
  e.missing_name
end
# => "HelloWorld"

Source: show | on GitHub

def missing_name
  
  
  
  message = respond_to?(:original_message) ? original_message : self.message
  return unless message.start_with?("uninitialized constant ")

  receiver = begin
    self.receiver
  rescue ArgumentError
    nil
  end

  if receiver == Object
    name.to_s
  elsif receiver
    "#{real_mod_name(receiver)}::#{self.name}"
  else
    if match = message.match(/((::)?([A-Z]\w*)(::[A-Z]\w*)*)$/)
      match[1]
    end
  end
end

Was this exception raised because the given name was missing?

begin
  HelloWorld
rescue NameError => e
  e.missing_name?("HelloWorld")
end
# => true

Source: show | on GitHub

def missing_name?(name)
  if name.is_a? Symbol
    self.name == name
  else
    missing_name == name.to_s
  end
end

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