Module: ActiveSupport::Dependencies::ModuleConstMissing

Defined in:
activesupport/lib/active_support/dependencies.rb

Overview

Module includes this module.

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.append_features(base) ⇒ Object 



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# File 'activesupport/lib/active_support/dependencies.rb', line 190

def self.append_features(base)
  base.class_eval do
    # Emulate #exclude via an ivar
    return if defined?(@_const_missing) && @_const_missing
    @_const_missing = instance_method(:const_missing)
    remove_method(:const_missing)
  end
  super
end

.exclude_from(base) ⇒ Object 



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# File 'activesupport/lib/active_support/dependencies.rb', line 200

def self.exclude_from(base)
  base.class_eval do
    define_method :const_missing, @_const_missing
    @_const_missing = nil
  end
end

.include_into(base) ⇒ Object 



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# File 'activesupport/lib/active_support/dependencies.rb', line 207

def self.include_into(base)
  base.include(self)
  append_features(base)
end

Instance Method Details

#const_missing(const_name) ⇒ Object 



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# File 'activesupport/lib/active_support/dependencies.rb', line 212

def const_missing(const_name)
  from_mod = anonymous? ? guess_for_anonymous(const_name) : self
  Dependencies.load_missing_constant(from_mod, const_name)
end

#guess_for_anonymous(const_name) ⇒ Object

We assume that the name of the module reflects the nesting (unless it can be proven that is not the case) and the path to the file that defines the constant. Anonymous modules cannot follow these conventions and therefore we assume that the user wants to refer to a top-level constant.



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# File 'activesupport/lib/active_support/dependencies.rb', line 222

def guess_for_anonymous(const_name)
  if Object.const_defined?(const_name)
    raise NameError.new "#{const_name} cannot be autoloaded from an anonymous class or module", const_name
  else
    Object
  end
end

#unloadable(const_desc = self) ⇒ Object 



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# File 'activesupport/lib/active_support/dependencies.rb', line 230

def unloadable(const_desc = self)
  super(const_desc)
end