Implemented asiniy#20

lib/ecto_state_machine.ex

@@ -25,15 +25,15 @@ defmodule EctoStateMachine do
           model
           |> Changeset.change(%{ unquote(column) => "#{unquote(event[:to])}" })
           |> unquote(event[:callback]).()
-          |> validate_state_transition(unquote(event), model)
+          |> unquote(:"validate_state_transition_#{column}")(unquote(event), model)
         end
 
         def unquote(:"can_#{event[:name]}?")(model) do
           :"#{Map.get(model, unquote(column))}" in unquote(event[:from])
         end
       end)
 
-      defp validate_state_transition(changeset, event, model) do
+      defp unquote(:"validate_state_transition_#{column}")(changeset, event, model) do
         change = Map.get(model, unquote(column))
 
         if :"#{change}" in event[:from] do

priv/test/dummy/repo/migrations/20160323060044_create_user.exs

@@ -4,6 +4,7 @@ defmodule Dummy.Repo.Migrations.CreateUser do
   def change do
     create table(:users) do
       add :rules, :string, null: false
+      add :level, :string, null: false
       add :confirmed_at, :datetime
     end
   end

test/dummy/web/models/user.ex

@@ -21,7 +21,23 @@ defmodule Dummy.User do
       ]
     ]
 
+  use EctoStateMachine,
+    column: :level,
+    states: [:beginner, :advanced, :expert],
+    events: [
+      [
+        name:     :ascend_advanced,
+        from:     [:beginner],
+        to:       :advanced
+      ], [
+        name:     :ascend_expert,
+        from:     [:advanced],
+        to:       :expert
+      ],
+    ]
+
   schema "users" do
     field :rules, :string
+    field :level, :string, default: "beginner"
   end
 end