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Use CommandedUniquenessMiddleware to ensure short-term value uniqueness, usually during Commanded command dispatch.

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commanded_uniqueness_middleware test support test_command_simple.ex
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test/support/test_command_simple.ex

defmodule TestCommandSimple do
defstruct [
:id,
:name
]
end
defimpl Commanded.Middleware.Uniqueness.UniqueFields, for: TestCommandSimple do
def unique(%TestCommandSimple{id: id}),
do: [
{:name, "has already been taken", id}
]
end