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ash_state_machine

0.2.13
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The extension for building state machines with Ash resources.

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ash_state_machine lib builtin_changes next_state.ex
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lib/builtin_changes/next_state.ex 

# SPDX-FileCopyrightText: 2023 ash_state_machine contributors <https://github.com/ash-project/ash_state_machine/graphs/contributors>

#

# SPDX-License-Identifier: MIT



defmodule AshStateMachine.BuiltinChanges.NextState do

  @moduledoc false

  use Ash.Resource.Change



  def change(changeset, _opts, _) do

    changeset.data

    |> AshStateMachine.possible_next_states(changeset.action.name)

    |> case do

      [to] ->

        AshStateMachine.transition_state(changeset, to)



      [] ->

        Ash.Changeset.add_error(changeset, "Cannot determine next state: no next state available")



      _ ->

        Ash.Changeset.add_error(

          changeset,

          "Cannot determine next state: multiple next states available"

        )

    end

  end

end