[7.x] Add the ability to makeMany (create many without saving) (#33021)

* [7.x] Add the ability to makeMany (create many without saving)

* fix code style

* Update HasOneOrMany.php

Co-authored-by: Graham Campbell <GrahamCampbell@users.noreply.github.com>

src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php

@@ -59,6 +59,23 @@ public function make(array $attributes = [])
         });
     }
 
+    /**
+     * Create and return an un-saved instances of the related models.
+     *
+     * @param  iterable  $records
+     * @return \Illuminate\Database\Eloquent\Collection
+     */
+    public function makeMany($records)
+    {
+        $instances = $this->related->newCollection();
+
+        foreach ($records as $record) {
+            $instances->push($this->make($record));
+        }
+
+        return $instances;
+    }
+
     /**
      * Set the base constraints on the relation query.
      *

tests/Database/DatabaseEloquentHasManyTest.php

@@ -26,6 +26,27 @@ public function testMakeMethodDoesNotSaveNewModel()
         $this->assertEquals($instance, $relation->make(['name' => 'taylor']));
     }
 
+    public function testMakeManyCreatesARelatedModelForEachRecord()
+    {
+        $records = [
+            'taylor' => ['name' => 'taylor'],
+            'colin' => ['name' => 'colin'],
+        ];
+
+        $relation = $this->getRelation();
+        $relation->getRelated()->shouldReceive('newCollection')->once()->andReturn(new Collection);
+
+        $taylor = $this->expectNewModel($relation, ['name' => 'taylor']);
+        $taylor->expects($this->never())->method('save');
+        $colin = $this->expectNewModel($relation, ['name' => 'colin']);
+        $colin->expects($this->never())->method('save');
+
+        $instances = $relation->makeMany($records);
+        $this->assertInstanceOf(Collection::class, $instances);
+        $this->assertEquals($taylor, $instances[0]);
+        $this->assertEquals($colin, $instances[1]);
+    }
+
     public function testCreateMethodProperlyCreatesNewModel()
     {
         $relation = $this->getRelation();