Use todo.done without ! in the controller to mark todo as done

app/controllers/dashboard/todos_controller.rb

@@ -6,7 +6,7 @@ class Dashboard::TodosController < Dashboard::ApplicationController
   end
 
   def destroy
-    todo.done!
+    todo.done
 
     todo_notice = 'Todo was successfully marked as done.'
 
@@ -20,7 +20,7 @@ class Dashboard::TodosController < Dashboard::ApplicationController
   end
 
   def destroy_all
-    @todos.each(&:done!)
+    @todos.each(&:done)
 
     respond_to do |format|
       format.html { redirect_to dashboard_todos_path, notice: 'All todos were marked as done.' }

app/models/todo.rb

@@ -38,7 +38,7 @@ class Todo < ActiveRecord::Base
 
   state_machine :state, initial: :pending do
     event :done do
-      transition [:pending, :done] => :done
+      transition [:pending] => :done
     end
 
     state :pending

spec/models/todo_spec.rb

@@ -73,15 +73,15 @@ describe Todo, models: true do
     end
   end
 
-  describe '#done!' do
+  describe '#done' do
     it 'changes state to done' do
       todo = create(:todo, state: :pending)
-      expect { todo.done! }.to change(todo, :state).from('pending').to('done')
+      expect { todo.done }.to change(todo, :state).from('pending').to('done')
     end
 
     it 'does not raise error when is already done' do
       todo = create(:todo, state: :done)
-      expect { todo.done! }.not_to raise_error
+      expect { todo.done }.not_to raise_error
     end
   end