Rails - set a db field to null from another object's controller

Question

I am attempting to set a Cabinet's Device's attributes to null in a disconnect method. cabinets_controller calls @cabinet.devices.destroy(@device) and that works ok. Before I do that I want to set @device.row_id = nil and @device.position = nil. They are both Fixnum and attr_accesible in the Device model. They are not being altered in the DB when I call this method. Is there a method to call on @device to make this happen?

Thanks.

I'm a little confused. Are you trying to update a record right before you destroy it? — atw13
– atw13, Commented Apr 1, 2013 at 15:26
The destroy method only removes the association. In this instance it removes cabinet_id from the device record. — Joe Essey
– Joe Essey, Commented Apr 1, 2013 at 16:11

sockmonk · Accepted Answer · 2013-04-01 15:50:39Z

1

I'm guessing that you're trying to break the connection between a @cabinet and a @device without completely deleting the @device. If you're already sure that @device belongs to @cabinet, it might be more straightforward to do something like:

@device.row_id = nil
@device.position = nil
@device.cabinet_id = nil
@device.save!

Basically you'll need to call .save or .save! on @device after setting those other fields to nil; while you're at it you may as well set cabinet_id that way, too.

answered Apr 1, 2013 at 15:50

sockmonk

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1 Comment

Joe Essey Over a year ago

Ah yes! I am such a fool. Thanks @sockmonk.

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