Method: Jinx::Inversible#set_inversible_noncollection_attribute

Defined in:
lib/jinx/resource/inversible.rb

#set_inversible_noncollection_attribute(newval, accessors, inverse_writer) ⇒ Object

Sets a non-collection attribute value in a way which enforces inverse integrity.

Parameters:

  • newval (Object) —

    the value to set

  • accessors ((Symbol, Symbol)) —

    the reader and writer methods to use in setting the attribute

  • inverse_writer (Symbol) —

    the inverse attribute writer method



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# File 'lib/jinx/resource/inversible.rb', line 24

def set_inversible_noncollection_attribute(newval, accessors, inverse_writer)
  rdr, wtr = accessors
  # the previous value
  oldval = send(rdr)
  # bail if no change
  return newval if newval.equal?(oldval)

  # clear the previous inverse
  logger.debug { "Moving #{qp} from #{oldval.qp} to #{newval.qp}..." } if oldval and newval
  if oldval then
    clr_wtr = self.class === oldval && oldval.send(rdr).equal?(self) ? wtr : inverse_writer
    oldval.send(clr_wtr, nil)
  end
  
  # call the writer
  send(wtr, newval)
  
  # call the inverse writer on self
  if newval then
    newval.send(inverse_writer, self)
    logger.debug { "Moved #{qp} from #{oldval.qp} to #{newval.qp}." } if oldval
  end
  
  newval
end