NameError - #<Sinatra::Application:0x0000000381bde0> 的未定义局部变量或方法“user_details”：

Question

当post输入表单详细信息时，我有一个基本的 Sinatra 应用程序。我收到此错误，尤其是当运行在 Heroku

上时

NameError - undefined local variable or method `user_details' for #:

我的post方法：

  post "/" do
  user_details = UserDetails.new(params["name"], params["email"])
  if user_details.valid?
    begin
      worksheet.insert_rows(worksheet.num_rows+1, [user_details.to_row])
      worksheet.save
      erb :thanks
    rescue
      erb :index
    end
  else
    erb :index
  end
end

查看：

<form action="/" method="POST">
          <div class="form-group<%= 'has-error' if user_details.errors.include?(:name) %>">
            <label for="name" class="control-label">Name</label>
            <input type="text" class="form-control" name="name" id="name" value="<%= user_details.name %>">
            <% user_details.errors.full_messages_for(:name).each do |message| %>
              <span class="help-block"><%= message %></span>
            <% end %>
          </div>
</form.

日志显示在第一个 div block/class.

中找不到 user_details 变量

有什么想法吗？

thanks.erb

<div class="jumbotron">
  <div class="container">
    <div class="row">
      <div class="col-md-12">
        <h1>Thanks!</h1>
        <p>We'll let you know when our platform is ready. Stay tuned!</p>
      </div>
      <div class="col-md-4">
        <a href="/"><button type="submit" class="btn btn-primary">Back</button></a>
      </div>
    </div>
  </div>
</div>

Answer 1

您定义了 user_details 一个局部变量，该变量在视图中不可用。两个选项：

定义实例变量 @user_details 并在视图中使用它。
定义一个局部变量user_details（就像现在这样）并渲染视图，传递变量：erb :thanks, locals: {user_details: user_details}（或erb :index, locals: {user_details: user_details}，不知道错误来自哪里）

NameError - #<Sinatra::Application:0x0000000381bde0> 的未定义局部变量或方法“user_details”：

NameError - undefined local variable or method `user_details' for #<Sinatra::Application:0x0000000381bde0>:

ruby

heroku

sinatra