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I am just pointing out that refactoring the code he proposed, removing duplicate code, we arrive again at the Rails controller he does not like.

I see duplicate code all over this "service based architecture".

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I mostly agree, with the exception of the initializer, something I haven't seen put to much use in controllers. The main thrust of my question was, do you have any links/examples for a DI based rails controller? Other than your "in theory" refactoring?

I do have examples of similar things but I cannot disclose the code as it was written in closed applications. For instance, I am guilty of redoing poorly the java servlet API using servlets.

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