使用Sinatra运行rackup时出错

Question

我正在跟踪Tuts+西纳屈课程，并得到了一个错误。这是我的代码：

config.ru

require "./app"

run App

app.rb

require "sinatra/base"

IMAGES [
    { title: "Utopia",      url: "http://www.techno-utopia.com/techno-utopia.jpg" },
    { title: "Alaska",      url: "http://www.cruisebrothers.com/images/Destinations/Alaska.jpg" },
    { title: "The Unknown", url: "http://www.tasospagakis.com/wp-content/uploads/2012/11/fear_of_the_unknown_by_ilhaman-d4cukmg1.jpg" }
]

class App < Sinatra::Base
    get "/images" do
        @images = IMAGES
        erb :images
    end

    get "/images/:index" do |index|
        @image = IMAGES[index]
    end

    get "/" do
        "Hello world!"
    end

    post "/" do
        "Hello world via POST!"
    end

    put "/" do
        "Hello world via PUT!"
    end

    delete "/" do
        "Goodbye world via DELETE!"
    end

    get "/hello/:first_name/?:last_name?" do |first, last|
        "Hello #{first} #{last}"
    end
 end

/视图/图像。

<h1>Images</h1>

<% @images.each do |image| %>
    <h2><%= image[:title] %></h2>
    <img src="<%= image[:url] %>">
<% end %>

下面是我运行rackup时的错误

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一如既往-非常感谢您能提供的任何帮助！

Answer 1

你只是错过了一个=

IMAGES = [
    { title: "Utopia",      url: "http://www.techno-utopia.com/techno-utopia.jpg" },
    { title: "Alaska",      url: "http://www.cruisebrothers.com/images/Destinations/Alaska.jpg" },
    { title: "The Unknown", url: "http://www.tasospagakis.com/wp-content/uploads/2012/11/fear_of_the_unknown_by_ilhaman-d4cukmg1.jpg" }
] 

变量通过放置变量名和赋值操作符(=)的任何一方来声明和赋值。来源