For me it means that the model represents a thing that does lots of work to make it easy to modify, but that it contains no decision making code whatsoever. High level business logic - the things that relate to the user (what data to retrieve for a request, what modifications on the model to do on behalf of the user), is in the controllers. Static policies, that are always enforced, like parameter validation, etc, can be mixed between the model and the controllers depending on context. The structure of the data is completely in the model.
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