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我是编程新手，正在阅读 Hartl 的 Ruby on Rails 教程并停留在第 2.3.1 节。

我需要为 Micropost 资源创建一个新的脚手架，并将新的数据模型迁移到数据库中。

我已经使用以下方法成功创建了一个新的脚手架：

$ rails generate scaffold Micropost content:string user_id:integer

作为回报，我看到：

$ rails generate scaffold Micropost content:string user_id:integer
  invoke  active_record
  create    db/migrate/20130711181712_create_microposts.rb
  create    app/models/micropost.rb
  invoke    test_unit
  create      test/unit/micropost_test.rb
  create      test/fixtures/microposts.yml
  invoke  resource_route
   route    resources :microposts
  invoke  scaffold_controller
  create    app/controllers/microposts_controller.rb
  invoke    erb
  create      app/views/microposts
  create      app/views/microposts/index.html.erb
  create      app/views/microposts/edit.html.erb
  create      app/views/microposts/show.html.erb
  create      app/views/microposts/new.html.erb
  create      app/views/microposts/_form.html.erb
  invoke    test_unit
  create      test/functional/microposts_controller_test.rb
  invoke    helper
  create      app/helpers/microposts_helper.rb
  invoke      test_unit
  create        test/unit/helpers/microposts_helper_test.rb
  invoke  assets
  invoke    coffee
  create      app/assets/javascripts/microposts.js.coffee
  invoke    scss
  create      app/assets/stylesheets/microposts.css.scss
  invoke  scss
identical    app/assets/stylesheets/scaffolds.css.scss

当我进入下一步迁移时，我输入：

$ bundle exec rake db:migrate

并看到迁移成功：

==  CreateUsers: migrating ====================================================
-- create_table(:users)
   -> 0.0020s
==  CreateUsers: migrated (0.0020s) ===========================================

==  CreateMicroposts: migrating ===============================================
-- create_table(:microposts)
   -> 0.0030s
==  CreateMicroposts: migrated (0.0030s) ======================================

我运行了一个本地主机，看到所有微博视图都显示正常，并且可以创建、更新和删除微博。

现在问题出在下一步，我需要更改文件夹“app/models/micropost.rb”以使用长度验证。但是，我没有看到模型文件夹中列出的“micropost.rb”文件。我只看到上一个练习中的“.gitkeep”和“user.rb”文件。

这让我相信迁移并不成功，尽管被告知并且我不知道该怎么做。请帮忙。

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1 回答 1

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Have you looked in app/models/micropost.rb? The generate script definitely states that it was created over there. If not, are the other files that this suggests in the folder? (e.g. apps/controllers/micropost_controller.rb, app/views/microposts/new.html.erb).

If still not, you may want to checkout a git commit before you ran the command rails generate scaffold Micropost content:string user_id:integer, or run rails destroy scaffold Micropost and re-do that action.

于 2013-07-11T23:23:19.380 回答