How can I add bootstrap's form-control class for the Ruby on Rails collection_select

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I have a collection_select tag where the user can select which web user to assign on for the ticket. The items on the collection_select will come from the database.

How can I add the bootstrap's form-control class to this collection_select tag?

I tried this code:

<%= f.collection_select :web_user_id, WebUser.all,:id,:email, include_blank: true, class: 'form-control' %>

but it didn't work. I also read these Ruby on Rails 5.2.0 documentation, but that didn't work.

<%= f.collection_select :web_user_id, WebUser.all,:id,:email, {prompt: "Select web users"}, { class: 'form-control' } %>

Try this it might help you.

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Turn your code into :

<%= f.collection_select :web_user_id, WebUser.all,:id,:email, {}, { :include_blank => true, class: 'form-control' } %>

It's part of the the method's html_options. See https://apidock.com/rails/ActionView/Helpers/FormOptionsHelper/collection_select for further infos.

You need to first set the options = {}, as empty braces at least {}.

Then, you can set your include_blank and class between the second braces (html_options = {}).

The final form should be like including {}, { :include_blank => true, class: 'form-control' }

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Just add {} after :email like

<%= f.collection_select :web_user_id, WebUser.all, :id, :email, {}, include_blank: true, class: 'form-control' %>

and see the generated HTML

<select include_blank="true" class="form-control" name="web_user[web_user_id]" id="web_user_web_user_id">
    <option value="20">avcd@example.com</option>
    <option value="21">sa@example.com</option>
</select>

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Comments
  • Did you check in the web inspector if the form-control class is present or not on the field ?
  • Also, does your interface or theme use Boostrap, as form-control is part of it ?
  • yes, it's not present on the field. Here, check what happened: snag.gy/rfav17.jpg
  • Try with this new edited version of my answer. It was missing {} before `{:include_blank ...'
  • Are you using form_for or simple_form?