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<form action="/foo" accept-charset="UTF-8" method="post"><input type="hidden" name="authenticity_token" value="BoxHJrwNELi5tsPmdc09vftQrDrVf2jEaO3iuBMliF1rF8vk6agBnoS4h_yLAo8ADxaDW7B2-VmPyER_FWLeQg" autocomplete="off" />
<div class="FormControl-spacingWrapper">
<div class="FormControl-check-group-wrap">
<fieldset aria-describedby="validation-0e518579-1b7d-43d6-9d5f-4c05dba21d38" class="">
<legend class="FormControl-label mb-2">
Cool places
</legend>
<div class="FormControl-spacingWrapper">
<div class="FormControl-checkbox-wrap">
<input aria-describedby="caption-7cfe4d13-5add-4d75-9324-3c0b2ea9041e" class="FormControl-checkbox" type="checkbox" value="lopez" name="places[]" id="places_lopez" />
<span class="FormControl-checkbox-labelWrap">
<label class="FormControl-label" for="places_lopez">
Lopez Island
</label> <span class="FormControl-caption" id="caption-7cfe4d13-5add-4d75-9324-3c0b2ea9041e">
<span>Vacation getaway</span>
</span>
</span>
</div>
<div class="FormControl-checkbox-wrap">
<input aria-describedby="caption-ddf730bb-6066-4ad4-8e55-f51a293b7b03" class="FormControl-checkbox" type="checkbox" value="bellevue" name="places[]" id="places_bellevue" />
<span class="FormControl-checkbox-labelWrap">
<label class="FormControl-label" for="places_bellevue">
Bellevue
</label> <span class="FormControl-caption" id="caption-ddf730bb-6066-4ad4-8e55-f51a293b7b03">Beautiful view</span>
</span>
</div>
<div class="FormControl-checkbox-wrap">
<input aria-describedby="caption-e43ab837-87c6-42eb-be43-2c063f5c5302" class="FormControl-checkbox" type="checkbox" value="seattle" name="places[]" id="places_seattle" />
<span class="FormControl-checkbox-labelWrap">
<label class="FormControl-label" for="places_seattle">
Seattle
</label> <span class="FormControl-caption" id="caption-e43ab837-87c6-42eb-be43-2c063f5c5302">The emerald city</span>
</span>
</div>
</div>
</fieldset>
<div class="mt-2">
<div class="FormControl-inlineValidation" id="validation-0e518579-1b7d-43d6-9d5f-4c05dba21d38" hidden="hidden">
<span class="FormControl-inlineValidation--visual" data-target="" hidden><svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-check-circle-fill">
<path d="M6 0a6 6 0 1 1 0 12A6 6 0 0 1 6 0Zm-.705 8.737L9.63 4.403 8.392 3.166 5.295 6.263l-1.7-1.702L2.356 5.8l2.938 2.938Z"></path>
</svg></span>
<span class=" FormControl-inlineValidation--visual" data-target=""><svg aria-hidden="true" height="12" viewBox="0 0 12 12" version="1.1" width="12" data-view-component="true" class="octicon octicon-alert-fill">
<path d="M4.855.708c.5-.896 1.79-.896 2.29 0l4.675 8.351a1.312 1.312 0 0 1-1.146 1.954H1.33A1.313 1.313 0 0 1 .183 9.058ZM7 7V3H5v4Zm-1 3a1 1 0 1 0 0-2 1 1 0 0 0 0 2Z"></path>
</svg></span>
<span></span>
</div>
</div>
<div class="mt-2">
</div>
</div>
</div>
</form>
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<%= primer_form_with(url: "/foo") do |f| %>
<%= render(ArrayCheckBoxGroupForm.new(f)) %>
<% end %>

app/forms/array_check_box_group_form.rb

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# frozen_string_literal: true
# :nodoc:
class ArrayCheckBoxGroupForm < ApplicationForm
form do |check_form|
# Passing a name: here causes the form to emit all the check boxes with the same name.
# In the case below, the name of each will be "places[]". If a box is checked, the
# resulting array will contain the corresponding value.
check_form.check_box_group(name: "places", label: "Cool places") do |check_group|
check_group.check_box(value: "lopez", label: "Lopez Island")
check_group.check_box(value: "bellevue", label: "Bellevue", caption: "Beautiful view")
check_group.check_box(value: "seattle", label: "Seattle", caption: "The emerald city")
end
end
end

app/forms/array_check_box_group_form/places_lopez_caption.html.erb

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<span>Vacation getaway</span>