Module: Delegation

Included in:
AppUpdate, Application, Runner
Defined in:
lib/delegation.rb

Instance Method Summary collapse

Instance Method Details

#delegate(*arguments) ⇒ Object

Defines a delegation to another object. Use this as follows:

delegate_to :a, :b, to: :foobar

This will delegate local methods ‘a’ and ‘b’ to the object returned by the accessor :foobar. Calling

self.a('test')

will now really call

self.foobar.a('test')

Raises:

  • (ArgumentError) 


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# File 'lib/delegation.rb', line 16

def delegate(*arguments)
  opts = arguments.pop
      
  raise ArgumentError, "Missing options hash at end of delegate arguments." \
    unless opts && opts[:to]
  
  to_ref = opts[:to]
  silent = opts[:silent]
  
  arguments.each do |name|
    define_method(name) do |*args, &block|
      obj = self.send(to_ref)
      
      fail "Delegation to nil object. (#{to_ref} - #{name})." \
        if !obj && !silent

      obj.send(name, *args, &block) if obj
    end
  end
end