Examples of using EctoStateMachine

failing_user.ex

defmodule Dummy.User do
  use Dummy.Web, :model

  use EctoStateMachine,
    states: [:unconfirmed, :confirmed, :blocked, :admin],
    events: [
      [
        name:     :confirm,
        from:     [:unconfirmed],
        to:       :confirmed,
        callback: fn(model) -> Ecto.Changeset.change(model, confirmed_at: Ecto.DateTime.utc) end # yeah you can bring your own code to these functions.
      ], [
        name:     :block,
        from:     [:confirmed, :admin],
        to:       :blocked
      ], [
        name:     :make_admin,
        from:     [:confirmed],
        to:       :admin
      ]
    ]

  schema "users" do
    field :name, :string
    field :state, :string, default: "unconfirmed"
  end
  
  def changeset(struct, params) do
    struct
     |> cast(params, [:name])
  end
end

passing_user.ex

defmodule Dummy.User do
  use Dummy.Web, :model

  use EctoStateMachine,
    states: [:unconfirmed, :confirmed, :blocked, :admin],
    events: [
      [
        name:     :confirm,
        from:     [:unconfirmed],
        to:       :confirmed,
        callback: fn(model) -> Ecto.Changeset.change(model, confirmed_at: Ecto.DateTime.utc) end # yeah you can bring your own code to these functions.
      ], [
        name:     :block,
        from:     [:confirmed, :admin],
        to:       :blocked
      ], [
        name:     :make_admin,
        from:     [:confirmed],
        to:       :admin
      ]
    ]

  import Ecto.Changeset
  
  schema "users" do
    field :name, :string
    field :state, :string, default: "unconfirmed"
  end
  
  def changeset(struct, params) do
    struct
     |> cast(params, [:name])
  end
end