implement todo deletion command

Author: ChristianAlexander

lib/todo_backend/router.ex

@@ -3,6 +3,8 @@ defmodule TodoBackend.Router do
 
   alias TodoBackend.Todos.Aggregates.Todo
   alias TodoBackend.Todos.Commands.CreateTodo
+  alias TodoBackend.Todos.Commands.DeleteTodo
 
   dispatch([CreateTodo], to: Todo, identity: :uuid)
+  dispatch([DeleteTodo], to: Todo, identity: :uuid)
 end

lib/todo_backend/todos/aggregates/todo.ex

@@ -9,8 +9,10 @@ defmodule TodoBackend.Todos.Aggregates.Todo do
   alias TodoBackend.Todos.Aggregates.Todo
 
   alias TodoBackend.Todos.Commands.CreateTodo
+  alias TodoBackend.Todos.Commands.DeleteTodo
 
   alias TodoBackend.Todos.Events.TodoCreated
+  alias TodoBackend.Todos.Events.TodoDeleted
 
   def execute(%Todo{uuid: nil}, %CreateTodo{} = create) do
     %TodoCreated{
@@ -21,6 +23,10 @@ defmodule TodoBackend.Todos.Aggregates.Todo do
     }
   end
 
+  def execute(%Todo{uuid: uuid}, %DeleteTodo{uuid: uuid}) do
+    %TodoDeleted{uuid: uuid}
+  end
+
   def apply(%Todo{} = todo, %TodoCreated{} = created) do
     %Todo{
       todo
@@ -30,3 +36,8 @@ defmodule TodoBackend.Todos.Aggregates.Todo do
         order: created.order
     }
   end
+
+  def apply(%Todo{uuid: uuid}, %TodoDeleted{uuid: uuid}) do
+    nil
+  end
+end

lib/todo_backend/todos/commands/delete_todo.ex

@@ -0,0 +1,5 @@
+defmodule TodoBackend.Todos.Commands.DeleteTodo do
+  defstruct [
+    :uuid
+  ]
+end

lib/todo_backend/todos/events/todo_deleted.ex

@@ -0,0 +1,6 @@
+defmodule TodoBackend.Todos.Events.TodoDeleted do
+  @derive Jason.Encoder
+  defstruct [
+    :uuid
+  ]
+end