The Concepts : Flow Execution Key

The flow execution key is a random string of 64 alphanumeric characters. It allows the ActionFlow Session Handler to restore a given state and continue a flow execution from the correct state hash snapshot.

The flow execution key always has to be returned to the controller after the execution of a view by the user. Each submission of data has to be related to a flow key. If you submit data to an ActionFlow controller without providing a key, the controller will assume that you are requesting a new flow chain execution and will call the step mapped by the start_with instruction.

Structure of the key

The key is constructed as follows.

Characters 1 to 8 inclusively
The characters identify a given flow execution sequence. It is also called a flow id.
Characters 9 to 64 inclusively
Those identify the state hash to restore the session data from.

The case used in the key is important. Only upper-case and numeric characters are used.

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