Ruby on Rails

Piotr, have a look at http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html

There are a ton of things that are auto-created by associations - one is a setter method that reflects the id's of the association. #collection_check_boxes basically formats your input to match that setter. In this case it would be "category_ids".

On Wed, Apr 20, 2016 at 1:54 PM, Frederick Cheung <frederic...@gmail.com> wrote:

On Wednesday, April 20, 2016 at 2:26:20 PM UTC+1, Piotr Brych wrote:
> OK, thanks for that, it might help.
>
>
> But how would you in this case send params back to `create` or `update` to respectively know which associations (category_organisations) should be created and which deleted?

Assigning to category_ids will create/delete rows in the join table as appropriate.

Fred.
>
> Thanks,
> Piotr
>  
>
>
> W dniu wtorek, 19 kwietnia 2016 17:19:21 UTC+2 użytkownik Frederick Cheung napisał:
>
>
>
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> As long as you don't want the same form to be usable to create new categories, I wouldn't use nested attributes at all.
>
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> f.collection_check_boxes :category_ids, Category.all, :id, :name
>
>
> will render a checkbox and label for each category, and the check box will be ticked if category_ids contains the element (there are plenty of options to customise the generated markup). I'm not entirely sure what happens if you assign to foo_ids but the overall save fails and rolls back. If you run into issues there  I'd add a virtual attribute to hold the assigned ids and actually set category_ids  from a before_save or similar.
>
>
> Fred                                    

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