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dagster

QQ: is there a difference between "io_manager_def" and "io_manager_key" ?

Yeah! `io_manager_def` takes an <https://docs.dagster.io/_apidocs/io-managers#dagster.IOManagerDefinition|IOManagerDefinition>, whereas `io_manager_key` takes a string which is the resource key that maps to the `io_manager`  object. If you have an io manager defined in your resources dictionary that you pass to your `Definitions` object, you’ll probably want to use `io_manager_key` to reference that io manager.

Personally, I mostly use `io_manager_key` . But it can be helpful to use `io_manager_def` for one-off io managers that won’t be used elsewhere in your project