Gerador de plugins Rails

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Rails plugins vs discourse plugins - what is the difference?

I want to make a plugin that needs its own tables. So its a good idea to have migration and model generators, because manually copying them from the main app dir will lead to errors and is just not very convenient. So I started making my own generators. I started with the migration generator: I could move on now and do the same for models and controllers. But now I started to read this Getting Started with Engines — Ruby on Rails Guides and now it seems to me that all of this might be a duplic…

How should I go about this?