Method: Jinx::Dependency#add_dependent_attribute

Defined in:
lib/jinx/metadata/dependency.rb

#add_dependent_attribute(attribute, *flags) ⇒ Object

Adds the given attribute as a dependent.

If the attribute inverse is not a collection, then the attribute writer is modified to delegate to the dependent owner writer. This enforces referential integrity by ensuring that the following post-condition holds:

  • owner.attribute.inverse == owner

where:

  • owner is an instance this attribute’s declaring class

  • inverse is the owner inverse attribute defined in the dependent class

Parameters:

  • attribute (Symbol) —

    the dependent to add

  • flags (<Symbol>) —

    the attribute qualifier flags



24
25
26
27
28
29
30
31
32
33
34
35
 
# File 'lib/jinx/metadata/dependency.rb', line 24

def add_dependent_attribute(attribute, *flags)
  prop = property(attribute)
  logger.debug { "Marking #{qp}.#{attribute} as a dependent attribute of type #{prop.type.qp}..." }
  flags << :dependent unless flags.include?(:dependent)
  prop.qualify(*flags)
  inverse = prop.inverse
  inv_type = prop.type
  # example: Parent.add_dependent_attribute(:children) with inverse :parent calls the following:
  #   Child.add_owner(Parent, :children, :parent)
  inv_type.add_owner(self, attribute, inverse)
  logger.debug { "Marked #{qp}.#{attribute} as a dependent attribute with inverse #{inv_type.qp}#{inverse}." }
end