module InheritedResources::BelongsToHelpers

def evaluate_parent(parent_symbol, parent_config, chain = nil) #:nodoc:

:nodoc:

association chain.
Evaluate the parent given. This is used to nest parents in the 
def evaluate_parent(parent_symbol, parent_config, chain = nil) #:nodoc:
  instantiated_object = instance_variable_get("@#{parent_config[:instance_name]}")
  return instantiated_object if instantiated_object
  parent = if chain
    chain.send(parent_config[:collection_name])
  else
    parent_config[:parent_class]
  end
  parent = parent.send(parent_config[:finder], params[parent_config[:param]])
  instance_variable_set("@#{parent_config[:instance_name]}", parent)
end

def parent 

def parent
  @parent ||= association_chain[-1]
end

def parent?


Parent is always true when belongs_to is called. 
def parent?
  true
end

def parent_type 

def parent_type
  parent.class.name.underscore.to_sym
end

def symbols_for_association_chain #:nodoc:

:nodoc:

it has some customization.
simply return the parent_symbols, however on polymorphic belongs to,
Maps parents_symbols to build association chain. In this case, it 
def symbols_for_association_chain #:nodoc:
  parents_symbols
end