I have a models Parent and Child, an the following association: Parent has_many :children, dependent: :destroy Child belongs_to :parent Further, I have two Parent instances: pfrom = Parent.find_by_id(from_id) pto = Parent.find_by_id(to_id) My goal is to transfer all children from pto to pfrom, and then delete pto. The first part seems to be easy: pfrom.children.each { |ch| ch.update_attributes!(parent_id: pto.id } If I run *only* this code, I can see that pto indeed contains now the children formerly belonging to pfrom, and iterating over pfrom shows that there are no children. HOWEVER, if I add the following line: pfrom.destroy I can see (from the SQL statements which are issued by this call), that all the former pfrom children are deleted! It somehow seems as if this information has been "cached". Could this be the case? How then would I correctly implement the "move". -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/f24f6034906a184a40a102fa92a2dc22%40ruby-forum.com. For more options, visit https://groups.google.com/d/optout.