[12.x] Feature/support/bugfix foreign string

src/Illuminate/Database/Schema/Blueprint.php

@@ -5,6 +5,7 @@
 use Closure;
 use Illuminate\Database\Connection;
 use Illuminate\Database\Eloquent\Concerns\HasUlids;
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
 use Illuminate\Database\Query\Expression;
 use Illuminate\Database\Schema\Grammars\Grammar;
 use Illuminate\Database\Schema\Grammars\MySqlGrammar;
@@ -1013,6 +1014,21 @@ public function foreignId($column)
         ]));
     }
 
+    /**
+     * Create a new string (8-bit) column on the table.
+     *
+     * @param  string  $column
+     * @return \Illuminate\Database\Schema\ForeignIdColumnDefinition
+     */
+    public function foreignString($column)
+    {
+        return $this->addColumnDefinition(new ForeignIdColumnDefinition($this, [
+            'type' => 'char',
+            'name' => $column,
+            'length' => Builder::$defaultStringLength,
+        ]));
+    }
+
     /**
      * Create a foreign ID column for the given model.
      *
@@ -1042,7 +1058,13 @@ public function foreignIdFor($model, $column = null)
                 ->referencesModelColumn($model->getKeyName());
         }
 
-        return $this->foreignUuid($column)
+        if (in_array(HasUuids::class, $modelTraits, true)) {
+            return $this->foreignUuid($column)
+                ->table($model->getTable())
+                ->referencesModelColumn($model->getKeyName());
+        }
+
+        return $this->foreignString($column)
             ->table($model->getTable())
             ->referencesModelColumn($model->getKeyName());
     }

tests/Database/Fixtures/Models/EloquentModelUsingUuid.php

@@ -2,31 +2,19 @@
 
 namespace Illuminate\Tests\Database\Fixtures\Models;
 
+use Illuminate\Database\Eloquent\Concerns\HasUuids;
 use Illuminate\Database\Eloquent\Model;
 
 class EloquentModelUsingUuid extends Model
 {
+    use HasUuids;
     /**
      * The table associated with the model.
      *
      * @var string
      */
     protected $table = 'model';
 
-    /**
-     * The "type" of the primary key ID.
-     *
-     * @var string
-     */
-    protected $keyType = 'string';
-
-    /**
-     * Indicates if the IDs are auto-incrementing.
-     *
-     * @var bool
-     */
-    public $incrementing = false;
-
     /**
      * Get the default foreign key name for the model.
      *