method

prepended

v7.0.0 - Show latest stable - 0 notes - Class: ActiveSupport::Concern

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What's this?

prepended(base = nil, &block) public

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.

Show source

# File activesupport/lib/active_support/concern.rb, line 173
    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

prepended

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