collection_check_boxes with custom: true doesn't allow select

[Dreamersoul]

trafficstars

the issue is present because the collection_check_boxes method doesn't generate id's for the input elements nor a for attribute for the label which breaks the check box.

My suggestion is as follows: if a custom id is not present generate an id as follows "#{input_name}_#{value}" to ensure it being unique

I looked into the source code and couldn't find the origin of the problem. if someone can guide me i'll be happy to submit a PR

[Dreamersoul]

after digging a little further i downloaded the source and added a test case for a collection with custom input and it indeed rendered correctly. i'm guessing i have a gem that is interfering with something

<%= bootstrap_form_with(model: project, local: true) do |form| %>
  <%= form.collection_check_boxes(:service_ids, Service.active, :id, :name, label: "Services", custom: true) %>
<% end %>

output:

<input value="" multiple="multiple" type="hidden" name="project[service_ids][]">
<div class="form-group">
    <label>Services</label>
    <div class="custom-control custom-checkbox">
        <input class="custom-control-input" type="checkbox" value="8" checked="checked"
            name="project[service_ids][]">
        <label class="custom-control-label">Branding</label>
    </div>
    <div class="custom-control custom-checkbox">
        <input class="custom-control-input" type="checkbox" value="7"
            name="project[service_ids][]">
        <label class="custom-control-label">Marketing</label>
    </div>
</div>