update_attribute performs a save on the model. Instead, just manually
set the property:
client.date_last_rent = rent.date
client.save ? nil : res = false
On Dec 14, 1:15 pm, "Matteo C." <[email protected]> wrote:
> Hi,
> i've got a little problem in my app.
> When I'm creating a new record in a model, i would like to update a
> field in a second model with the value of one of the fields of the
> first model.
>
> Example:
>
> # model Rent
> ...
> t.timestamp :date
> ...
>
> # model Client
> ...
> t.timestamp :date_last_rent
> ...
>
> When I create a new rent rent, I would like to save the rent.date
> value into client.date_last_rent. So in RentController i do this:
>
> def create
> @rent = Rent.new(params[:rent])
>
> respond_to do |format|
> if @rent.save and Client.update_date_last_rent(@rent)
> flash[:notice] = "ok"
> ...
> else
> ....
> flash[:error] = "ko"
> end
> end
>
> In my model Client.rb I do this:
>
> def self.update_fifo_queue(rent)
> res = true
>
> client = Client.find(line.rent_id)
> client.update_attribute(:date_last_rent => rent.date)
> client.save ? nil : res = false
>
> return res
> end
>
> It works, but i'm not sure about the code in case of error..... If the
> rent.save fail, the client.date_last_value is modified!!
>
> How can i do to avoid this problem? I've read about after_save/
> before_save but i never used it and i can't find examples about it!
>
> Any suggestion is appreciated!
> Matteo C.
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