Multiple selection in RoR form_for

Question

I have a list of items that I want to have as options for a variable. They will be saved in the model as an array, and are to be displayed as a list in the form_for. I was using

f.select(:var_name, [["option1"],["option2"],["option3"]], {}, {multiple: "multiple"})

Which works great to save into the model. But when going back to the form, nothing is selected (even if the variable has them all saved). Then if I submit the form again, it passes an empty array. The only way for it to save correctly is to re-select the ones I want every time I view the form. How can I get them to pass into the multi-select box?

After doing some more looking, I think it needs :selected => 'something' But I'm not sure what to put in there?? — Josh Johnson, Feb 14 '12 at 17:48

kwarrick · Answer 1 · 2012-02-15T04:44:33.453

0

I believe your problem stems from your choices parameter. You probably need an array of [option,id] mappings:

f.select(:person_id, Person.all.collect {|p| [ p.name, p.id ] }, {}, { :multiple => true })

edited Feb 15 '12 at 04:44

answered Feb 14 '12 at 20:15

kwarrick

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I'm not sure why, but it's working now, and didn't need the option,id arry. – Josh Johnson Feb 15 '12 at 13:48

score 0 · Answer 2 · answered Feb 15 '12 at 13:52

When I started working on it again today, it was working. I'm not sure what change was made, but it could be that I needed to restart the server. It still looks like

f.select(:name, [[" "],["option"],["option2"],["option3"]], {}, {:multiple => true})

So it must not have been this code. In addition, the form beginning looks like

form_for(@model_name) do |f|

which hasn't changed either.

Regardless, it works now. Thanks!

Multiple selection in RoR form_for

2 Answers2