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I used generate scaffold to setup the basic RESTful actions however I want to extend the actions to include something like ‘purchase’. Is there a way to use the command line to generate the boilerplate (stub functions in controller file and updated route file?)?
As far as I can tell generate controller either wipes or leaves the existing file – there’s no nice way to merge them.
Not by default. However, realize that in Rails 3, customizing generators isn’t terribly difficult. See Creating and Customizing Rails Generators & Templates, and Bates’ screencast on Generators in Rails 3.
Regarding your second “question,” that’s right — the file is either replaced or overwritten.