我正在尝试使用设计在自定义页面中构建嵌套表单。
出现的错误是: undefined method `build_profile' for nil:NilClass
<%= form_for("user", :url => user_registration_path) do |f| %>
<%= f.email_field :email, :autofocus => true, :placeholder => 'E-mail Address' %>
<%= f.password_field :password, :placeholder => 'Password' %>
<%= f.password_field :password_confirmation, :placeholder => 'Password Confirmation' %>
<% @user.build_profile %>
<%= f.fields_for :profile do |profile_form| %>
<%= profile_form.text_field :name, :placeholder => 'Name' %>
<%= profile_form.text_field :address, :placeholder => 'Address' %>
<%= profile_form.phone_field :phone, :placeholder => 'Phone (example: 0193284647)' %>
<% end %>
<p><%= f.submit "Sign up", :class=>'btn btn-primary' %> </p>
<% end %>
编辑(额外信息):
我应该通过创建 users_controller.rb 添加 @user = @user.build_profile 吗?
会不会导致设计出现问题?