Method: ActiveSupport::Concern#prepended

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

#prepended(base = nil, &block) ⇒ Object

Evaluate given block in context of base class, so that you can write class macros here. When you define more than one prepended block, it raises an exception.



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# File 'activesupport/lib/active_support/concern.rb', line 175

def prepended(base = nil, &block)
  if base.nil?
    if instance_variable_defined?(:@_prepended_block)
      if @_prepended_block.source_location != block.source_location
        raise MultiplePrependBlocks
      end
    else
      @_prepended_block = block
    end
  else
    super
  end
end