以下是代码的相关部分：

形成：

<%= f.fields_for :user_account,@user.user_account do |user_account| %> 
<p>Edit email address for account: <%=  @user.user_account.email %></p> 
<div class="field">
  <%= user_account.label :new_email %><br />
  <%= user_account.text_field :email,autocomplete: "off",value: nil %>
</div>
<div class="field">
  <%= user_account.label :password %> <i>(please confirm the password associated with this account)</i><br />
  <%= user_account.password_field :current_password,autocomplete: "off" %>
</div>
<%= hidden_field_tag 'form','email' %>
<div class="actions">
  <%= user_account.submit "Edit" %>
</div>

控制器：

def update
respond_to do |format|
if params[:form] == 'email'
    if @user.user_account.valid_password?(params[:user][:user_account_attributes][:current_password])
      if @user.update(user_params)
        format.html { redirect_to user_path(@user),:notice => 'your new email has been saved' }
        format.json { render :show,status: :ok,location: @user }
      else
        format.html { render :edit }
        format.json { render json: @user.errors,status: :unprocessable_entity }
      end
    else 
      format.html { redirect_to edit_email_path(@user),:notice => 'incorrect password (email)' }
    end 
else ...

user_params方法：

def user_params
params.require(:user).permit(
  :first_name,:middle_initial,:last_name,:linkedin,:website,:facebook,:video,:phone_number,:address_1,:address_2,:city,:zip_code,:image,:number,:years_practicing,:neighborhood,:biography,:price,:status,user_employments_attributes: [:id,:user_id,:company,:position,:start_date,:end_date,:info,:_destroy],user_educations_attributes: [:id,:school,:degree_title,user_account_attributes: [:id,:email,:password,:password_confirmation,user_category_ids:[])
end

用户帐户模型：

class UserAccount < ActiveRecord::Base
  # Include default devise modules. Others available are:
  #,:lockable,:timeoutable and :omniauthable
  devise :database_authenticatable,:registerable,:confirmable,:recoverable,:rememberable,:trackable,:validatable
   belongs_to :user
 end