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 < [email protected]> 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: > > > > > > > > > > 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 > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/8b2c9630-8070-4ae8-8bf5-8749f77cb992%40googlegroups.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CA%2BCQ937JkEcLnrBPDkAgNs2-F%3DZCyNfP5aiSYXxZ1qc4ZjzYSw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
