Add ability to ignore transition to same state

docs/working-with-transitions/01-configuring-transitions.md

@@ -44,7 +44,37 @@ Transitions can then be used like so:
 $payment->state->transitionTo(Paid::class);
 ```
 
-This line will only work when a valid transition was configured. If the initial state of `$payment` already was `Paid`, a `\Spatie\ModelStates\Exceptions\TransitionNotFound` will be thrown instead of changing the state. 
+This line will only work when a valid transition was configured. If the initial state of `$payment` already was `Paid`, a `\Spatie\ModelStates\Exceptions\TransitionNotFound` will be thrown instead of changing the state.
+
+## Ignoring same state transitions
+
+In some cases you may want to handle transition to same state without manually setting `allowTransition`, you can call `ignoreSameState`
+
+Please note that the `StateChanged` event will fire anyway.
+
+```php
+abstract class PaymentState extends State
+{
+    // …
+
+    public static function config(): StateConfig
+    {
+        return parent::config()
+            ->ignoreSameState()
+            ->allowTransition([Created::class, Pending::class], Failed::class, ToFailed::class);
+    }
+}
+```
+
+It also works with `IgnoreSameState` Attribute
+
+```php
+#[IgnoreSameState]
+abstract class PaymentState extends State
+{
+    //...
+}
+```
 
 ## Allow multiple transitions at once
 

src/Attributes/AttributeLoader.php

@@ -35,6 +35,12 @@ public function load(StateConfig $stateConfig): StateConfig
 
             $stateConfig->default($defaultStateAttribute->defaultStateClass);
         }
+
+        if ($this->reflectionClass->getAttributes(IgnoreSameState::class)[0] ?? null) {
+            /** @var \Spatie\ModelStates\Attributes\IgnoreSameState $transitionAttribute */
+
+            $stateConfig->ignoreSameState();
+        }
 
 	    $registerStateAttributes = $this->reflectionClass->getAttributes(RegisterState::class);
 

src/Attributes/IgnoreSameState.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Spatie\ModelStates\Attributes;
+
+use Attribute;
+
+#[Attribute(Attribute::TARGET_CLASS)]
+class IgnoreSameState {}

src/StateConfig.php

@@ -19,6 +19,9 @@ class StateConfig
     /** @var string[] */
     public array $registeredStates = [];
 
+    /** @var bool */
+    public bool $shouldIgnoreSameState = false;
+
     public string $stateChangedEvent = StateChanged::class;
 
     public function __construct(
@@ -34,6 +37,13 @@ public function default(string $defaultStateClass): StateConfig
         return $this;
     }
 
+    public function ignoreSameState(): StateConfig
+    {
+        $this->shouldIgnoreSameState = true;
+
+        return $this;
+    }
+
     public function allowTransition($from, string $to, ?string $transition = null): StateConfig
     {
         if (is_array($from)) {
@@ -72,6 +82,10 @@ public function allowTransitions(array $transitions): StateConfig
 
     public function isTransitionAllowed(string $fromMorphClass, string $toMorphClass): bool
     {
+        if($this->shouldIgnoreSameState && $fromMorphClass === $toMorphClass){
+            return true;
+        }
+
         $transitionKey = $this->createTransitionKey($fromMorphClass, $toMorphClass);
 
         return array_key_exists($transitionKey, $this->allowedTransitions);
@@ -81,7 +95,11 @@ public function resolveTransitionClass(string $fromMorphClass, string $toMorphCl
     {
         $transitionKey = $this->createTransitionKey($fromMorphClass, $toMorphClass);
 
-        return $this->allowedTransitions[$transitionKey];
+        if(array_key_exists($transitionKey, $this->allowedTransitions)) {
+            return $this->allowedTransitions[$transitionKey];
+        }
+
+        return null;
     }
 
     public function transitionableStates(string $fromMorphClass): array

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelAttributeState.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+use Spatie\ModelStates\Attributes\AllowTransition;
+use Spatie\ModelStates\Attributes\DefaultState;
+use Spatie\ModelStates\Attributes\IgnoreSameState;
+use Spatie\ModelStates\State;
+
+#[
+    DefaultState(IgnoreSameStateModelAttributeStateA::class),
+    AllowTransition(IgnoreSameStateModelAttributeStateA::class, IgnoreSameStateModelAttributeStateB::class),
+    IgnoreSameState
+]
+abstract class IgnoreSameStateModelAttributeState extends State
+{
+}

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelAttributeStateA.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+
+class IgnoreSameStateModelAttributeStateA extends IgnoreSameStateModelAttributeState
+{
+}

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelAttributeStateB.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+class IgnoreSameStateModelAttributeStateB extends IgnoreSameStateModelAttributeState
+{
+}

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelState.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+use Spatie\ModelStates\State;
+use Spatie\ModelStates\StateConfig;
+
+abstract class IgnoreSameStateModelState extends State
+{
+    public static function config(): StateConfig
+    {
+        return parent::config()
+            ->ignoreSameState()
+            ->allowTransition(IgnoreSameStateModelStateA::class, IgnoreSameStateModelStateB::class)
+            ->default(IgnoreSameStateModelStateA::class);
+    }
+}

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelStateA.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+class IgnoreSameStateModelStateA extends IgnoreSameStateModelState
+{
+}

tests/Dummy/IgnoreSameStateModelState/IgnoreSameStateModelStateB.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState;
+
+class IgnoreSameStateModelStateB extends IgnoreSameStateModelState
+{
+}

tests/Dummy/TestModelIgnoresSameState.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy;
+
+use Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState\IgnoreSameStateModelState;
+
+class TestModelIgnoresSameState extends TestModel
+{
+    protected $casts = [
+        'state' => IgnoreSameStateModelState::class,
+    ];
+}

tests/Dummy/TestModelIgnoresSameStateByAttribute.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Spatie\ModelStates\Tests\Dummy;
+
+use Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState\IgnoreSameStateModelAttributeState;
+
+class TestModelIgnoresSameStateByAttribute extends TestModel
+{
+    protected $casts = [
+        'state' => IgnoreSameStateModelAttributeState::class,
+    ];
+}

tests/TransitionTest.php

@@ -1,10 +1,12 @@
 <?php
 
+use Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState\IgnoreSameStateModelAttributeStateA;
 use Illuminate\Support\Facades\Event;
 use Spatie\ModelStates\DefaultTransition;
 use Spatie\ModelStates\Events\StateChanged;
 use Spatie\ModelStates\Exceptions\TransitionNotAllowed;
 use Spatie\ModelStates\Exceptions\TransitionNotFound;
+use Spatie\ModelStates\Tests\Dummy\IgnoreSameStateModelState\IgnoreSameStateModelStateA;
 use Spatie\ModelStates\Tests\Dummy\ModelStates\StateA;
 use Spatie\ModelStates\Tests\Dummy\ModelStates\StateB;
 use Spatie\ModelStates\Tests\Dummy\ModelStates\StateC;
@@ -13,6 +15,8 @@
 use Spatie\ModelStates\Tests\Dummy\OtherModelStates\StateY;
 use Spatie\ModelStates\Tests\Dummy\OtherModelStates\StateZ;
 use Spatie\ModelStates\Tests\Dummy\TestModel;
+use Spatie\ModelStates\Tests\Dummy\TestModelIgnoresSameState;
+use Spatie\ModelStates\Tests\Dummy\TestModelIgnoresSameStateByAttribute;
 use Spatie\ModelStates\Tests\Dummy\TestModelWithCustomTransition;
 use Spatie\ModelStates\Tests\Dummy\TestModelWithTransitionsFromArray;
 use Spatie\ModelStates\Tests\Dummy\Transitions\CustomInvalidTransition;
@@ -171,3 +175,27 @@
 
     expect($model->state)->toBeInstanceOf(StateC::class);
 });
+
+it('ignore transition to same state', function(){
+    $model = TestModelIgnoresSameState::create([
+        'state' => IgnoreSameStateModelStateA::class
+    ]);
+
+    expect($model->state->canTransitionTo(IgnoreSameStateModelStateA::class))->toBeTrue();
+
+    $model->state->transitionTo(IgnoreSameStateModelStateA::class);
+
+    expect($model->state)->toBeInstanceOf(IgnoreSameStateModelStateA::class);
+});
+
+it('ignore transition to same state using Attribute', function(){
+    $model = TestModelIgnoresSameStateByAttribute::create([
+        'state' => IgnoreSameStateModelAttributeStateA::class
+    ]);
+
+    expect($model->state->canTransitionTo(IgnoreSameStateModelAttributeStateA::class))->toBeTrue();
+
+    $model->state->transitionTo(IgnoreSameStateModelAttributeStateA::class);
+
+    expect($model->state)->toBeInstanceOf(IgnoreSameStateModelAttributeStateA::class);
+});