Wednesday, July 23, 2014
pfrom.children=[]
would do it.That's actually *exactly* what will do it. :)Running that will do a single UPDATE query to set all the involved parent_id columns to NULL. So one way to implement the swap is:saved_children = pfrom.children.to_apfrom.children = []pto.children = saved_children
This will depend on what you have set the :dependant option on the association to - it would do this if you have set the option to nullify (the default), but it would destroy the children if it was :destroy or :delete_all
Fred
NOTE: this won't work if there are children on pto already. For that, try `pto.children = pto.children + saved_children`.--Matt Jones
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