CQRS

CQRS is modeled as commands, queries, and optional read models.

architecture :cqrs,
  commands: "app/commands/**/*.rb",
  queries: "app/queries/**/*.rb",
  read_models: "app/read_models/**/*.rb"

This checks:

• commands do not depend on queries
• queries do not depend on commands
• queries do not call obvious mutating methods such as save!, update!, or destroy!
• the declared components do not form cycles

The Rails default is:

preset :rails_cqrs

This is a structural check. It does not prove that every read and write path obeys CQRS at runtime.