fix(pivot): only use unique classes in the pivot union (Fixes #1606)

Author: pataar

src/Console/ModelsCommand.php

@@ -729,8 +729,13 @@ public function getPropertiesFromMethods($model)
                                             $pivot = $this->getClassNameInDestinationFile($model, $pivot);
 
                                             if ($existingPivot = ($this->properties[$relationObj->getPivotAccessor()] ?? null)) {
-                                                // If the pivot is already set, we need to append the type to it
-                                                $pivot .= '|' . $existingPivot['type'];
+                                                if(!str_contains($existingPivot['type'], $pivot . '|')) {
+                                                    // If the pivot is already set, we need to append the type to it
+                                                    $pivot .= '|' . $existingPivot['type'];
+                                                } else {
+                                                    // this class is already set
+                                                    $pivot = $existingPivot['type'];
+                                                }
                                             } else {
                                                 // pivots are not always set
                                                 $pivot .= '|null';

tests/Console/ModelsCommand/Pivot/Models/ModelWithPivot.php

@@ -33,6 +33,12 @@ public function relationCustomPivotUsingSameAccessor()
             ->using(CustomPivot::class);
     }
 
+    public function relationCustomPivotUsingSameAccessorAndClass()
+    {
+        return $this->belongsToMany(ModelwithPivot::class)
+            ->using(CustomPivot::class);
+    }
+
     public function relationWithDifferentCustomPivotUsingSameAccessor()
     {
         return $this->belongsToMany(ModelwithPivot::class)

tests/Console/ModelsCommand/Pivot/__snapshots__/Test__test__1.php

@@ -14,6 +14,8 @@
  * @property-read DifferentCustomPivot|CustomPivot|null $pivot
  * @property-read \Illuminate\Database\Eloquent\Collection<int, ModelWithPivot> $relationCustomPivotUsingSameAccessor
  * @property-read int|null $relation_custom_pivot_using_same_accessor_count
+ * @property-read \Illuminate\Database\Eloquent\Collection<int, ModelWithPivot> $relationCustomPivotUsingSameAccessorAndClass
+ * @property-read int|null $relation_custom_pivot_using_same_accessor_and_class_count
  * @property-read CustomPivot|null $customAccessor
  * @property-read \Illuminate\Database\Eloquent\Collection<int, ModelWithPivot> $relationWithCustomPivot
  * @property-read int|null $relation_with_custom_pivot_count
@@ -52,6 +54,12 @@ public function relationCustomPivotUsingSameAccessor()
             ->using(CustomPivot::class);
     }
 
+    public function relationCustomPivotUsingSameAccessorAndClass()
+    {
+        return $this->belongsToMany(ModelwithPivot::class)
+            ->using(CustomPivot::class);
+    }
+
     public function relationWithDifferentCustomPivotUsingSameAccessor()
     {
         return $this->belongsToMany(ModelwithPivot::class)