ruby-on-rails - Issue with controller generation in rails

Question

New to Ruby on Rails so this may be a stupid question. I have an app and I can bundle my gems without issue. So now I want to add some mostly static pages. I try to generate a controller for them with rails generate controller MostlyStatic page1 page2. This should generate a controller named mostly_static and pages named page1 and page2. Instead, I throw an error. Apparently the generate command is trying to connect to the database, which I have not yet created. There is nothing in these pages that should be a database table, so I'm a bit confused as to why the database is being brought into the process at this juncture. I've looked through various tutorials and none say that a database is required to generate controllers for static pages. So... what am I missing? Do I need to create the database first just to generate static pages? And, if so, will subsequently dropping any tables created by that generation impair the function of my app? I really don't want a bunch of useless tables for static pages hanging around. Is there a way to generate these pages and controllers without the database?

Answer 1

您没有遵循生成控制器的约定。生成控制器不会创建数据库表。rails generate model您必须通过调用或rails generate resource来做到这一点rails generate scaffold。

因此，您需要一个用于几个静态页面的控制器。尝试这个

rails generate controller static_pages home help contact

请注意生成器是复数和蛇形大小写（static_pages）。这将生成静态控制器和home.html.erb, help.html.erb, 和contact.html.erb页面

现在您可以在控制器中使用这些操作访问页面

def home
end

def help
end

def contact
end

还需要确保设置了路线

# routes.rb

match '/home',    to: 'static_pages#home'
match '/help',    to: 'static_pages#help'
match '/contact',    to: 'static_pages#contact'

没有设置数据库，您可以访问页面。这就是你需要做的所有事情。只需遵循约定，例如复数控制器和单数模型，并且 rails 负责处理细节。希望这能让你开始

更新

回应这里的评论是生成控制器的标准输出。请注意，我的示例使用 haml 而不是 erb，但输出中没有与数据库相关的内容。

rails g controller static_pages home help contact
  create  app/controllers/static_pages_controller.rb
   route  get "static_pages/contact"
   route  get "static_pages/help"
   route  get "static_pages/home"
  invoke  haml
  create    app/views/static_pages
  create    app/views/static_pages/home.html.haml
  create    app/views/static_pages/help.html.haml
  create    app/views/static_pages/contact.html.haml
  invoke  rspec
  create    spec/controllers/static_pages_controller_spec.rb
  create    spec/views/static_pages
  create    spec/views/static_pages/home.html.haml_spec.rb
  create    spec/views/static_pages/help.html.haml_spec.rb
  create    spec/views/static_pages/contact.html.haml_spec.rb
  invoke  helper
  create    app/helpers/static_pages_helper.rb
  invoke    rspec
  create      spec/helpers/static_pages_helper_spec.rb
  invoke  assets
  invoke    coffee
  create      app/assets/javascripts/static_pages.js.coffee
  invoke    scss
  create      app/assets/stylesheets/static_pages.css.scss

Answer 2

对于遇到这个问题的任何人，正确的答案是数据库不需要存在，但它必须正确配置，就好像它确实存在于配置文件中一样。生成控制器实际上并不创建数据库。