add method removeRelation which remove a dynamic relation

Author: railken

src/DynamicRelations.php

@@ -3,6 +3,7 @@
 namespace Imanghafoori\Relativity;
 
 use Illuminate\Support\Str;
+use Imanghafoori\Relativity\Exceptions;
 
 trait DynamicRelations
 {
@@ -20,6 +21,15 @@ public function hasDynamicRelation(string $relation)
         return isset(static::$dynamicRelations[$relation]);
     }
 
+    public static function removeRelation(string $relationName)
+    {
+        if (!isset(static::$dynamicRelations[$relationName])) {
+            throw new Exceptions\UndefinedDynamicRelationException($relationName);
+        }
+
+        unset(static::$dynamicRelations[$relationName]);
+    }
+
     public static function defineRelation($relationType, $relationName, $data, $constraints)
     {
         $method = function () use ($relationType, $data, $constraints) {

src/Exceptions/UndefinedDynamicRelationException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Imanghafoori\Relativity\Exceptions;
+
+use Exception;
+
+class UndefinedDynamicRelationException extends Exception
+{
+    public function __construct(string $relation)
+    {
+        $this->message = sprintf("Undefined dynamic relation '%s' called", $relation);
+    }
+}

tests/BasicTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Imanghafoori\Relativity\Tests;
+
+use Imanghafoori\Relativity\Tests\RelativeModels\User;
+use Imanghafoori\Relativity\Tests\RelativeModels\Comment;
+use Imanghafoori\Relativity\Exceptions\UndefinedDynamicRelationException;
+
+class BasicTest extends TestCase
+{
+    public function test_remove_relation()
+    {
+        User::has_many('comments', Comment::class);
+        $this->assertTrue((new User)->hasDynamicRelation('comments'));
+        $this->assertEquals(1, count((new User)->getDynamicRelations()));
+
+        User::removeRelation('comments');
+        $this->assertFalse((new User)->hasDynamicRelation('comments'));
+        $this->assertEquals(0, count((new User)->getDynamicRelations()));
+    }
+
+    public function test_exception_undefined_relation()
+    {
+        $this->expectException(UndefinedDynamicRelationException::class);
+        User::removeRelation('comments');
+    }
+}