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The rails project only supports debugging the main server application of the project. Even though this is a common case, a rails app can often have other aspects that need debugging. These can be stand-alone ruby scripts for batch processing, test code, or other ruby code invoked from rake or shell scripts. The debugger and run menus should support user configured execution environments like Eclipse has for specifying the main program, the execution options, the command arguments, and so on. In particular the option to execute a single test case in the debugger to see what is happening is a common scenario when writing tests first then using that structure to debug aspects of the system.
Yes, you are definitely right. We need to come with something better. But did not get into 6.0, we are after feature freeze and can't do any UI changes. To be done for after 6.0 release. Note that you can already at least debug rake tasks. But it does not solve this issue.