irb(main):001:0>1=>1irb(main):002:0>1.methods=> [:to_s, :inspect, :-@, :+, :-, :*, :/, :div, :%, :modulo, :divmod, :fdiv, :**, :abs, :magnitude, :==, :===, :<=>, :>, :>=, :<, :<=, :~, :&, :|, :^, :[], :<<, :>>,
数据验证和使用的数据库种类无关,终端用户也无法跳过,而且容易测试和维护。在 Rails 中做数据验证很简单,Rails 内置了很多帮助方法,能满足常规的需求,而且还可以编写自定义的验证方法。 数据存入数据库之前的验证方法还有其他几种,包括数据库内建的约束,客户端验证和控制器层验证。下面列出了这几种验证方法的优缺点:...
Rails 内建支持 Ruby I18n(internationalization 的简写)。Ruby I18n 这个 gem 用法简单,是个扩展性强的框架,可以把程序翻译成英语之外的其他语言,或者为程序提供多种语言支持。 “国际化”是指把程序中的字符串或者其他需要本地化的内容(例如,日期和货币的格式)提取出来的过程。“本地化”是指把提取出来的内容翻译...
1.cycle(first_value, *values) # Alternate CSS classes for even and odd numbers... @items = [1,2,3,4] <table> <% @items.each do |item| %> <tr class="<%= cycle("odd", "even") -%>"> <td>item</td> </tr> <% end %> </table> 2.image_tag生成image标签 <%= image_ta...
[ruby on rails] 深入(2) ruby基本语法 1. 调试&注释&打印输出1.1 调试ruby属于解释型语言,即脚本,在linux上,脚本的执行无非三种: 1. 用解释器运行脚本1 解释器 脚本文件 即:ruby 脚本文件2. 直接运行脚本在脚本文件里面用 1 #! 脚本解释器 定义好脚本解释器路径,然后再授予脚本执行权限,接着直接运行 ...
“Ruby would be irrelevant”. I can’t say for sure whether or not that’s true, but I do know that it would be a huge shame if the world missed out on such a superb language. The fact is: the author of Rails picked Ruby deliberately, and his ‘wild’ bet paid off with huge ...
RUBY ON RAILS--Web Development Platform that doesn't HurtBefore starting about Ruby on Rails, it's important that we Understand a little about whatruby language is all about on which ROR (Ruby on Rails) is based.Rubyis areflective,object-orientedprogramming language. It combines syntax ...
find here about Ruby, Ruby On Rails, Linux etc…The Container Revolution: How Docker Transformed Dev & What’s AheadContainerization has reshaped the way we build, ship, and run applications. From simplifying dependency management to enabling micro-services architectures at scale, containers and ...
$ rails console >> p = Person.new(name: "John Doe") => #<Person id: nil, name: "John Doe", created_at: nil, updated_at: nil> >> p.new_record? => true >> p.save => true >> p.new_record? => false 新建并保存记录会在数据库中执行 SQLINSERT操作。更新现有的记录会在数据库...
Hello from Rails! 5. 这时再在浏览器中输入地址:http://127.0.0.1:3000/Say/Hello,之后会看到一个页面,如下图: OK,今天就先到这里,现在还只是知其然不知其所以然,希望后面有精力深入研究下去。 Ruby on rails 开发从头来(windows)(三)-实现页面间的跳转 开发从头来( )(三 实现页面间的跳转 )( Posted...