Sinatra:'/ route'中的NameError,未定义的局部变量或方法

Question

我正在尝试为cms网站建立一个管理员后端.

这是我的应用程序的结构

??? app.rb
??? Gemfile
??? models
?   ??? models.rb
??? routes
?   ??? routes.rb
??? views
    ??? categories.erb
    ??? # ... other view files

app.rb

require 'sinatra'
require 'data_mapper'
require 'dm-core'
require 'dm-migrations'
require 'digest'

enable :sessions

DataMapper.setup(:default, 'mysql://username:password@localhost/database')
require './models/models.rb' 
require './routes/routes.rb'
DataMapper.finalize

models.rb

class Category
  include DataMapper::Resource

  property :id,         Serial
  property :name,       String

  has n, :posts
end
# other model definitons

我在routes.rb中定义了categories一条路线

...
get '/categories' do 
    @categories = Category.all
    erb :categories
end 
...

view(categories.erb)文件的内容.

                #table headers   
                <tbody>
                <% @categories.each do |c| %>
                    <tr>
                        <td>
                            <%= c.id %>
                        </td>
                        <td>
                            <%= c.name %>
                        </td>
                        <td>
                            <%= ?.posts.count %>
                        </td>
                        <td>
                            <%= c.posts(:order => [:updated_at.desc]).first.updated_at.strftime("%d/%m/%Y") %>
                        </td>
                    </tr>
                <% end %>
                </tbody>

当我浏览到/categories路由时,服务器吐出此错误

NameError at /categories
undefined local variable or method `?' for #<Sinatra::Application:0x0000000284bc08>

我之前没有遇到过这样的问题.而且真的不知道发生了什么.

问题可能不在于应用程序结构(app.rb中的require序列),因为在get '/categories'我定义了一个post '/login'检查数据库记录的用户输入的路由之前.它按我想要的方式工作.

post '/login' do 
    email = params[:email]
    pwd = params[:password]

    user = Author.first(:email=>email)

    if user.nil?
        redirect to ('/register')
    elsif !user.nil?
        if Digest::MD5.hexdigest(pwd) == user.password
        ... #and so on

UPDATE

我用相同的方法列出了其他表/模型,并且它们都按照我的预期工作,但是类别.

other routes  
get '/articles' do 
    @articles = Post.all(:is_blog_post => false)
    erb :site_articles
end
##blog articles
get '/blogposts' do 
    @barticles = Post.all(:is_blog_post => true)
    erb :blog_articles
end
#users
get '/admin_users' do
    @admins = Author.all(:is_admin=>true)
    erb :admin_users 
end

#bloggers
get '/bloggers' do
    @bloggers = Author.all(:is_admin=>false)
    erb :blog_users 
end

和相应的视图文件 网站文章

            <tbody>
            <% @articles.each do |art| %>
                <tr>
                    <td>
                        <%= art.title %>
                    </td>
                    <td>
                        <%= art.author.full_name %>
                    </td>
                    <td>
                        <%= art.category.name %>
                    </td>
                    <td>
                        <%= art.updated_at.strftime("%d/%m/%Y %H:%M") %>
                    </td>
                    <td>
                        <%= art.featured? ? "Yes" : "No" %>
                    </td>
                </tr>
                <% end %>
            </tbody>

博客文章

            <tbody>
            <% @barticles.each do |art| %>
                <tr>
                    <td>
                        <%= art.title %>
                    </td>
                    <td>
                        <%= art.author.full_name %>
                    </td>
                    <td>
                        <%= art.category.name %>
                    </td>
                    <td>
                        <%= art.updated_at.strftime("%d/%m/%Y %H:%M") %>
                    </td>
                    <td>
                        <%= art.featured? ? "Yes" : "No" %>
                    </td>
                </tr>
                <% end %>
            </tbody>

管理员

            <tbody>
            <% @admins.each do |admin| %>
                <tr>
                    <td>
                        <%= admin.full_name %>
                    </td>
                    <td>
                        <%= admin.email %>
                    </td>
                    <td>
                        <%= !admin.twitter.nil? ? admin.twitter : "N/A" %>
                    </td>
                    <td>
                        <%= !admin.facebook.nil? ? admin.facebook : "N/A" %>
                    </td>
                    <td>
                        <%= !admin.phone.nil? ? admin.phone : "N/A" %>
                    </td>
                    <td>
                        <%= admin.posts.count %>
                    </td>
                </tr>
                <% end %>
            </tbody>

博客

                <tbody> 
                <% @bloggers.each do |blogger| %>
                    <tr>
                        <td>
                            <%= blogger.full_name %>
                        </td>
                        <td>
                            <%= blogger.email %>
                        </td>
                        <td>
                            <%= !blogger.twitter.nil? ? blogger.twitter : "N/A" %>
                        </td>
                        <td>
                            <%= !blogger.facebook.nil? ? blogger.facebook : "N/A" %>
                        </td>
                        <td>
                            <%= !blogger.phone.nil? ? blogger.phone : "N/A" %>
                        </td>
                        <td>
                            <%= blogger.posts.count %>
                        </td>
                    </tr>
                    <% end %>
                </tbody>

Answer 1

你在某种程度上得到了一个奇怪的角色.这不是一个"正常的"拉丁c的线<%= ?.posts.count %>,它是U + 0441,西里尔文小写字母ES.它看起来像拉丁美洲人c.

要解决此问题,只需删除该字符并使用法线重新编写即可c.