Defines a block of transitions.

By default transitions/1 expects the module using Machinist has a struct defined with a state attribute

transitions do
  # ...
end

Defines a block of transitions for a specific struct or defines a block of transitions just passing the attr option to define the attribute holding the state

Examples

A Candidate being handled by two different versions of a SelectionProcess

defmodule Candidate do
  defstruct state: :new
end

defmodule SelectionProcess.V1 do
  use Machinist

  transitions Candidate do
    from :new, to: :registered, event: "register"
  end
end

defmodule SelectionProcess.V2 do
  use Machinist

  transitions Candidate do
    from :new, to: :enrolled, event: "enroll"
  end
end

Providing the attr option to define the attribute holding the state

defmodule Candidate do
  defstruct candidate_state: :new

  use Machinist

  transitions attr: :candidate_state do
    from :new, to: :registered, event: "register"
  end
end

Defines a block of transitions for a specific struct with attr option defining the attribute holding the state

transitions Candidate, attr: :candidate_state do
  # ...
end