Deviseで独自のカラム（first_name, last_name）を追加するメモ
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登録
app/views/users/registrations/new.html.erb
<h2>Sign up</h2>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
.
..
<div class="field">
<%= f.label :last_name %><br />
<%= f.text_field :last_name %>
</div>
<div class="field">
<%= f.label :first_name %><br />
<%= f.text_field :first_name %>
</div>
..
.
<% end %>
更新
app/views/users/registrations/edit.html.erb
<h2>Edit <%= resource_name.to_s.humanize %></h2>
<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
.
..
<div class="field">
<%= f.label :last_name %><br />
<%= f.text_field :last_name %>
</div>
<div class="field">
<%= f.label :first_name %><br />
<%= f.text_field :first_name %>
</div>
..
.
<% end %>
Controller
app/controllers/users/registrations_controller.rb
class Users::RegistrationsController < Devise::RegistrationsController
before_action :configure_sign_up_params, only: [:create]
before_action :configure_account_update_params, only: [:update]
..
.
protected
def configure_sign_up_params
devise_parameter_sanitizer.permit(:sign_up, keys: [:first_name, :last_name])
end
def configure_account_update_params
devise_parameter_sanitizer.permit(:account_update, keys: [:first_name, :last_name])
end
..
.
end