Rails form_for multiple collection_select, values not selected on form failure -


i'm not sure why, form not showing options selected on submit, though params hash shows information being returned page.

collection select code:

<%= f.collection_select :post_topic_ids, posttopic.all, :id, :name, {}, { multiple: true, class: 'form-control' } %>

which renders:

<select multiple="multiple" class="form-control" name="post[post_topic_ids][]" id="post_post_topic_ids">   <option value="1">psychology</option>   <option value="2">engineering</option>   <option value="3">nanotechnology</option> </select>

params returned after form validation error

params = {"post"=>{"post_topic_ids"=>["", "1"]}}

update

i have tried:

<%= select_tag 'post_topic_ids', options_for_select(posttopic.all.collect{ |p| [p.name, p.id] }), multiple: true %>

and:

<%= select_tag 'post_topic_ids', options_from_collection_for_select(posttopic.all, "id", "name"), multiple: true %>

which renders:

<select name="post_topic_ids[]" id="post_topic_ids" multiple="multiple"><option value="1">psychology</option> <option value="2">engineering</option> <option value="3">nanotechnology</option></select>

you need specify element selected third parameter

<%= select_tag 'post_topic_ids', options_for_select(posttopic.all.collect{ |p| [p.name, p.id] }, --->selected_element<---), multiple: true %>

look @ http://apidock.com/rails/actionview/helpers/formoptionshelper/options_for_select examples.


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