Remove instance of model and its associations

Rails
1

I’m a newb with a quick question.

I have a model
class Call
has_many :visits
and
class Visit
belongs_to :call

If I delete a call will it automatically delete the associated
visits??
Any help will be greatly appreciated

2

On Jul 5, 2008, at 5:22 PM, THEBIGO wrote:

I’m a newb with a quick question.

I have a model
class Call
has_many :visits
has_many :visits, :dependent => :destroy

this should do the trick.

Best.
Mike

3

On Jul 5, 2008, at 5:22 PM, THEBIGO wrote:

If I delete a call will it automatically delete the associated
visits??

Sorry, I was too quick on the draw with the last email.

The association you have will not delete the visits. The last message
I posted will destroy associated visits when you destroy the call.

If you don’t want AR callbacks to fire on the associated vists you can
use has_many :visits, :dependent => :delete_all

Best.
Mike

4

Mike - Thank you for your response so I take it that if I have say 20
calls and call with call.id = 5 and if
there are say 11 visits with various visit.id’s but with their call_id
= 5 linking them to the above call
then when I execute the delete action for call with id=5 then it will
be deleted along with it’s 11 visits
then I should use the first one you said

has_many :visits, :dependent => :destroy ???

Thanks again

5

On Jul 5, 2008, at 6:37 PM, THEBIGO wrote:

Mike - Thank you for your response so I take it that if I have say 20
calls and call with call.id = 5 and if
there are say 11 visits with various visit.id’s but with their call_id
= 5 linking them to the above call
then when I execute the delete action for call with id=5 then it will
be deleted along with it’s 11 visits
then I should use the first one you said

has_many :visits, :dependent => :destroy ???

From the API

:

dependent - If set to :destroy all the associated objects are
destroyed alongside this object by calling their destroy method. If
set to :delete_all all associated objects are deleted without calling
their destroy method. If set to :nullify all associated objects’
foreign keys are set to NULL without calling their save callbacks.
Warning: This option is ignored when also using the :through option.

Best.
Mike

6

Thank you mike so very much - it worked like a charm. One more
itteration complete
Owen