Devise不将用户名插入数据库

class User < ApplicationRecord
  # ...
  devise :token_authenticatable, :confirmable, :recoverable, :rememberable, :validatable
  # ...
end

rails generate migration AddAuthenticationTokenToUsers authentication_token:string:index
rails db:migrate

class Users::SessionsController < Devise::SessionsController
  # ...
  prepend_before_action :require_no_authentication, only: [:create]
  before_action :ensure_params_exist, only: :create
  skip_before_action :verify_signed_out_user, only: :destroy
  prepend_before_action :authenticate_scope!, only: [:destroy]
  prepend_before_action :verify_authenticity_token, only: :destroy
  prepend_before_action -> { request.env["devise.skip_timeout"] = true }, only: :destroy
  # ...
end

<%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
  # ...
  <div class="field">
    <%= f.label :authentication_token %><br />
    <%= f.text_field :authentication_token, autofocus: true %>
  </div>
  # ...
<% end %>