ruby-on-rails - form_for in dev 它是如何工作的？

Question

rails g devise:views 命令生成该 View

<h2>Sign up</h2>

    <%= form_for(resource, :as => resource_name, :url => registration_path(resource_name))   do |f| %>
    <%= devise_error_messages! %>

   <div><%= f.label :username %><br />
   <%= f.text_field :username, :autofocus => true %></div>

  <div><%= f.label :email %><br />
  <%= f.email_field :email, :autofocus => true %></div>

  <div><%= f.label :password %><br />
  <%= f.password_field :password %></div>

  <div><%= f.label :password_confirmation %><br />
  <%= f.password_field :password_confirmation %></div>

  <div><%= f.submit "Sign up" %></div>
<% end %>

<%= render "devise/shared/links" %>

我的问题是它是如何工作的“form_for(resource, : as=>resource_name, ...”

Answer 1

resource是一个简单的记录(或对象)——对于 Devise，它通常被称为 User或类似。其余参数为form_for是选项，详见 form_for docs.