Rails:当模型已经存在时如何运行“rails generate scaffold"? [英] Rails: How to run `rails generate scaffold` when the model already exists?

问题描述

我是 Rails 的新手，所以我当前的项目处于一种奇怪的状态.

I'm new to Rails so my current project is in a weird state.

我生成的第一件事是电影"模型.然后我开始更详细地定义它，添加一些方法等.

One of the first things I generated was a "Movie" model. I then started defining it in more detail, added a few methods, etc.

我现在意识到我应该用 rails generate scaffold 生成它来连接路由、视图、控制器等.

I now realize I should have generated it with rails generate scaffold to hook up things like the routing, views, controller, etc.

我尝试生成脚手架，但收到错误消息，指出同名迁移文件已存在.

I tried to generate the scaffolding but I got an error saying a migration file with the same name already exists.

现在为我的电影"创建脚手架的最佳方式是什么?(使用导轨 3)

What's the best way for me to create scaffolding for my "Movie" now? (using rails 3)

推荐答案

TL;DR: rails g scaffold_controller

即使您已经有了一个模型，您仍然可以使用 rails generate 选项生成必要的控制器和迁移文件.如果您运行 rails generate -h，您可以看到所有可用的选项.

Even though you already have a model, you can still generate the necessary controller and migration files by using the rails generate option. If you run rails generate -h you can see all of the options available to you.

Rails:
  controller
  generator
  helper
  integration_test
  mailer
  migration
  model
  observer
  performance_test
  plugin
  resource
  scaffold
  scaffold_controller
  session_migration
  stylesheets

如果您想为模型生成控制器脚手架，请参阅scaffold_controller.为清楚起见，以下是相关说明:

If you'd like to generate a controller scaffold for your model, see scaffold_controller. Just for clarity, here's the description on that:

存根脚手架控制器及其视图.传递模型名称，CamelCased 或 under_scored，以及作为参数的视图列表.控制器名称作为模型的复数版本被检索名字.

Stubs out a scaffolded controller and its views. Pass the model name, either CamelCased or under_scored, and a list of views as arguments. The controller name is retrieved as a pluralized version of the model name.

要在模块中创建控制器，请将模型名称指定为路径如parent_module/controller_name".

To create a controller within a module, specify the model name as a path like 'parent_module/controller_name'.

这会在 app/controllers 中生成一个控制器类并调用 helper，模板引擎和测试框架生成器.

This generates a controller class in app/controllers and invokes helper, template engine and test framework generators.

要创建资源，您将使用 resource 生成器，要创建迁移，您还可以查看 migration 生成器(请参阅，有一个模式所有这些疯狂).这些提供了创建丢失文件以构建资源的选项.或者，您可以使用 --skip 选项运行 rails generate scaffold 以跳过任何存在的文件:)

To create your resource, you'd use the resource generator, and to create a migration, you can also see the migration generator (see, there's a pattern to all of this madness). These provide options to create the missing files to build a resource. Alternatively you can just run rails generate scaffold with the --skip option to skip any files which exist :)

我建议花一些时间查看生成器内部的选项.我觉得它们在书籍等中没有得到很好的记录，但它们非常方便.

I recommend spending some time looking at the options inside of the generators. They're something I don't feel are documented extremely well in books and such, but they're very handy.

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