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The problem with concerns is that they don't actually break down the god classes, they just separate the pieces of the god class into different files and combin

• grey-area 13y ago
  You don't have to use them for that, you can use them for composing models out of shared bits of functionality, for example 5 of your models have a status - put all the code about statuses in one place in a concern and include Status in your models, and possibly similar for controllers - this cuts code duplication. There is also an argument for making models smaller by splitting some of their functionality into modules too (what you're talking about), but I think that's a weaker case - better to use concerns for shared code.