app/views/users/registrations/_form_fields.html.erb
<div class="form-group">
<%= f.text_field :first_name,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'first_name' },
placeholder: 'First name'
%>
</div>
<div class="form-group">
<%= f.text_field :last_name,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'last_name' },
placeholder: 'Last name'
%>
</div>
<div class="form-group">
<%= f.text_field :street_address,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'street_address' },
placeholder: 'Street address'
%>
</div>
<div class="form-group">
<%= f.text_field :street_address_second,
class: 'form-control form-control-user',
aria: { 'label': 'Apt, Suite, Floor, etc.' },
placeholder: 'Apt, Suite, Floor, etc.'
%>
</div>
<div class="form-group">
<%= f.text_field :city,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'City' },
placeholder: 'City'
%>
</div>
<div class="form-group">
<%= f.text_field :state,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'State' },
placeholder: 'State'
%>
</div>
<div class="form-group">
<%= f.text_field :postal_code,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'Postal code' },
placeholder: 'Postal code'
%>
</div>
<div class="form-group">
<%= f.phone_field :phone_number,
required: true,
class: 'form-control form-control-user',
aria: { 'label': 'Phone' },
placeholder: 'Phone',
value: number_to_phone(f.object.phone_number)
%>
</div>