class ActionView::PartialRenderer

def partial_path(object, view)

method will prefix the partial paths with a namespace.
If +prefix_partial_path_with_controller_namespace+ is true, then this

then an +ArgumentError+ is raised.
will provide the path. If the object does not respond to +to_partial_path+,
responds to +to_partial_path+, then +to_partial_path+ will be called and
Obtains the path to where the object's partial is located. If the object 
def partial_path(object, view)
  object = object.to_model if object.respond_to?(:to_model)
  path = if object.respond_to?(:to_partial_path)
    object.to_partial_path
  else
    raise ArgumentError.new("'#{object.inspect}' is not an ActiveModel-compatible object. It must implement :to_partial_path.")
  end
  if view.prefix_partial_path_with_controller_namespace
    prefixed_partial_names[path] ||= merge_prefix_into_object_path(@context_prefix, path.dup)
  else
    path
  end
end