Ruby on Rails

On Wednesday, April 20, 2016 at 2:26:20 PM UTC+1, Piotr Brych wrote:
> OK, thanks for that, it might help.
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> 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.
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> Thanks,
> Piotr
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> 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
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> 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.
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> Fred                                    

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