Module: ActiveSupport::Dependencies::ModuleConstMissing

Defined in:
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

:nodoc:



174
175
176
177
178
179
180
181
182
 
# File 'lib/active_support/dependencies.rb', line 174

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 



184
185
186
187
188
189
 
# File 'lib/active_support/dependencies.rb', line 184

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

Instance Method Details

#const_missing(const_name) ⇒ Object 



191
192
193
194
 
# File 'lib/active_support/dependencies.rb', line 191

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.



201
202
203
204
205
206
207
 
# File 'lib/active_support/dependencies.rb', line 201

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 



209
210
211
 
# File 'lib/active_support/dependencies.rb', line 209

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