Question

I have a has_one relationship that must exist:

has_one :child, :dependent => :destroy
validates_presence_of :child

In my controller I build the child on new with:

@parent.build_child

When the form is submitted with errors, the render ends up losing the built child. This causes my fields_for to be blank, thus preventing the user from inputting the required child field(s). Any ideas?

Answer 1

Figured it out:

before_filter :build_child, :only => [:new, :edit]

Was supposed to be:

before_filter :build_child, :only => [:new, :edit, :create, :update]