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Define the use of queries object.

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This is a follow up post to my YouTube video Repository Pattern, Done Right. If you haven’t seen this video, it’s best to watch it first, before continuing reading.

There have been many interesting questions in the discussion area and I’ve replied to most (if not all) of them. One that has come up a few times is:

Should we favour command/query objects over repositories?

A few have referred me to Jimmy Bogard’s post. So, in this post, I’ll be comparing these two approaches and pros / cons of each.

Before I get started, I need to emphasise: neither the repository pattern, nor command / query objects, are silver-bullets. Just because these architectural patterns exist, doesn’t mean you should use them in every single application. If your queries are simple enough (one or two lines), don’t worry about creating an abstraction over them. There is nothing wrong with writing them in your controllers (assuming a web application).

If you do, however, have fat queries that have bloated your controllers, you might want to consider one of these patterns to achieve “better separation of concerns”
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