如何从 Rails 生成器获取有关类型修饰符的文档
How to get documentation from Rails generators about type modifiers
在 Active Record Migrations in Rails 4.2.x, the section 2.3 Passing Modifiers 的文档中说：
Some commonly used type modifiers can be passed directly on the
command line. They are enclosed by curly braces and follow the field
type:
For instance, running:
$ bin/rails generate migration AddDetailsToProducts
'price:decimal{5,2}' supplier:references{polymorphic}
...
Have a look at the generators help output for further details.
然而，运行 bundle exec rails generate migration --help in Rails 4.2.x（在我的例子中是 4.2.3）没有提到任何关于传递类型修饰符的事情——我可以连一个花括号都看不到。
我可以在 3.5 Column Modifiers 上看到一些文档，但是我如何获得被称为来自 "generators help output" 的文档？
要获取描述类型修饰符的内联帮助，您需要运行
bundle exec rails generate model --help
另外，帮助文本来自这里：https://github.com/randoum/rails/blob/master/railties/lib/rails/generators/rails/model/USAGE
在 Active Record Migrations in Rails 4.2.x, the section 2.3 Passing Modifiers 的文档中说：
Some commonly used type modifiers can be passed directly on the command line. They are enclosed by curly braces and follow the field type:
For instance, running:
$ bin/rails generate migration AddDetailsToProducts 'price:decimal{5,2}' supplier:references{polymorphic}
...
Have a look at the generators help output for further details.
然而，运行 bundle exec rails generate migration --help in Rails 4.2.x（在我的例子中是 4.2.3）没有提到任何关于传递类型修饰符的事情——我可以连一个花括号都看不到。
我可以在 3.5 Column Modifiers 上看到一些文档，但是我如何获得被称为来自 "generators help output" 的文档？
要获取描述类型修饰符的内联帮助，您需要运行
bundle exec rails generate model --help
另外，帮助文本来自这里：https://github.com/randoum/rails/blob/master/railties/lib/rails/generators/rails/model/USAGE