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?

Thanks,
Piotr
 


W dniu wtorek, 19 kwietnia 2016 17:19:21 UTC+2 użytkownik Frederick Cheung 
napisał:
>
>
>
> 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.
>
> 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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