On Monday, February 5, 2018 at 11:46:24 AM UTC-5, Walter Lee Davis wrote:
>
> You (effectively) delete the intermediate object. You could try one of two
> things:
>
> @person.pictures -= [@picture]
>
> If all the items are persisted, then that should delete the join object
> immediately. (Just tested, it did work here.)
>
> @person.pictures = @person.pictures.to_a.reject{ |p| p == @picture }
>
> (Long-hand way to do the same thing)
>
> Now if you have a UI around this, what you would do is build an array of
> checkboxes with the picture IDs in them, and then use the helper method
> @person.picture_ids=(array of ids) that the association built for you. You
> don't need to do any of the above long-hand.
>
> So in your controller, you would add picture_ids: [] to the end of your
> list of allowed attributes in the strong parameters. Next, you would create
> a checkbox for each attached image in your form:
>
> <%- @person.pictures.each do |picture| %>
> <%= check_box_tag 'person[picture_ids][]', picture.id, true %>
> <%= image_tag picture.file_url %> (just guessing how your internals look,
> do something here to show a thumbnail)
> <%- end %>
>
> And that should do the whole thing for you.
>
> Walter
>
> > On Feb 5, 2018, at 1:18 AM, fugee ohu <fuge...@gmail.com <javascript:>>
> wrote:
> >
> > So if @person.pictures << @picture adds a picture to a person, how do
> you remove a picture from a person?
> >
> >
>
>
I dunno why this doesn't produce any output
<% @pictures=Picture.all %>
<% @pictures.all do |picture| %>
<% if @person %>
<% if picture.person_id == @person.id %>
<%= check_box_tag 'person[picture_ids][]', picture.id, true %>
<% else %>
<%= check_box_tag 'person[picture_ids][]', picture.id %>
<% end %>
<%= image_tag picture.name.thumb %>
<% end %>
<% end %>
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