Question

我不知道为什么它会向我显示这个问题。显示/home/muba/muba/app/views/author/new.html.erb其中第3行被提出：

<DOCTYPE! html>
<html lang="en">
<head>
    <title>Testing Out BootStrap</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha512-dTfge/zgoMYpP7QbHy4gWMEGsbsdZeCXz7irItjcC3sPUFtf0kuFbDz/ixG7ArTxmDjLXDmezHubeNikyKGVyQ==" crossorigin="anonymous">

    <!-- Optional theme -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css" integrity="sha384-aUGj/X2zp5rLCbBxumKTCw2Z50WgIr1vs/PFN4praOTvYXWlVyh2UtNUU0KAUhAX" crossorigin="anonymous">
</head>

<body>
    <header>
        <nav class="navbar navbar-default">
          <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
              <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
              </button>
              <a class="navbar-brand" href="#">Brand</a>
            </div>

            <!-- Collect the nav links, forms, and other content for toggling -->
            <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
              <ul class="nav navbar-nav">
                <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
                <li><a href="#">Link</a></li>
                <li class="dropdown">
                  <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
                  <ul class="dropdown-menu">
                    <li><a href="#">Action</a></li>
                    <li><a href="#">Another action</a></li>
                    <li><a href="#">Something else here</a></li>
                    <li role="separator" class="divider"></li>
                    <li><a href="#">Separated link</a></li>
                    <li role="separator" class="divider"></li>
                    <li><a href="#">One more separated link</a></li>
                  </ul>
                </li>
              </ul>
              <form class="navbar-form navbar-left" role="search">
                <div class="form-group">
                  <input type="text" class="form-control" placeholder="Search">
                </div>
                <button type="submit" class="btn btn-default">Submit</button>
              </form>
              <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Link</a></li>
                <li class="dropdown">
                  <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
                  <ul class="dropdown-menu">
                    <li><a href="#">Action</a></li>
                    <li><a href="#">Another action</a></li>
                    <li><a href="#">Something else here</a></li>
                    <li role="separator" class="divider"></li>
                    <li><a href="#">Separated link</a></li>
                  </ul>
                </li>
              </ul>
            </div><!-- /.navbar-collapse -->
          </div><!-- /.container-fluid -->
        </nav>
                ...
              </div>
            </nav>
    </header>

    <!-- Latest compiled and minified JavaScript -->
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js" integrity="sha512-K1qjQ+NcF2TYO/eI3M6v8EiNYZfA95pQumfvcVrTHtwQVDG+aHRqLi/ETn2uB+1JqwYqVG3LIvdm9lj6imS/pQ==" crossorigin="anonymous"></script>
</body>

Author.rb控制器

<%= form_for @author do |f| %>
<div class="form-group">
<%= f.label :first_name %><br/>
<%= f.text_field :first_name, class:'form-control' %><br/>
</div>

<% end %>

但是我为我的分类页面做了同样的事情。代码是：

class AuthorController < ApplicationController
def new
@page_title= 'Add new Author'
@author = Author.new
end

def create
end

def update
end

def edit
end

def destroy
end

def index
end

def show
end
def author_params 
params.require(:author).permit(:first_name, :last_name)
end
end

Category.rb控制器

<%= form_for @category do |f| %>
<div class="form-group">
<%= f.label :name %><br/>
<%= f.text_field :name, class:'form-control' %><br/>
</div>
<%=f.submit "Submit", class:'btn btn-primary' %>
<%= link_to "Cancel", categories_path, class:'btn btn-default' %> 
<% end %>

Answer 1

我注意到你的第一行应该有问题

class AuthorsController < ApplicationController

而不是

class AuthorController < ApplicationController

还要确保您的控制器的文件名是 authors_controller.rb

Ruby on Rails遵循语言约定。检查 Ruby and Rails Naming Conventions

Answer 2

在您看来：

<%= form_for @author do |f| %>
<div class="form-group">
<%= f.label :first_name %><br/>
<%= f.text_field :first_name, class:'form-control' %><br/>
</div>

<% end %>

此处，确保first_name作为数据库表中作者模型中的列名存在。它将检查表中的确切名称，如果名称不匹配，将引发错误。

我希望这会有所帮助。

作者#new中的NoMethodError

2 个答案: