✨ Feat: Add firstOrInsert method to Query Builder with tests

This commit introduces a new `firstOrInsert` method to the Laravel Query Builder.

This method efficiently retrieves the first record matching the given attributes,
or inserts a new record with the provided attributes and values if no record is found.

It includes comprehensive unit tests to ensure its functionality and reliability.

This enhancement provides a convenient way to perform "first or insert" operations
directly within the query builder, improving developer workflow and code conciseness.

src/Illuminate/Database/Query/Builder.php

@@ -3915,6 +3915,26 @@ public function updateOrInsert(array $attributes, array|callable $values = [])
         return (bool) $this->limit(1)->update($values);
     }
 
+    /**
+     * Get the first record matching the attributes or insert it.
+     *
+     * @param array $attributes
+     * @param array $values
+     * @return object
+     */
+    public function firstOrInsert(array $attributes, array $values = []): object
+    {
+        $record = $this->where($attributes)->first();
+
+        if (! is_null($record)) {
+            return $record;
+        }
+
+        $this->insert(array_merge($attributes, $values));
+
+        return $this->where($attributes)->first();
+    }
+
     /**
      * Insert new records or update the existing ones.
      *

tests/Database/DatabaseQueryBuilderTest.php

@@ -4141,6 +4141,72 @@ public function testUpdateOrInsertMethodWorksWithEmptyUpdateValues()
         $builder->shouldNotHaveReceived('update');
     }
 
+    public function testFirstOrInsertMethodRecordExists()
+    {
+        $builder = m::mock(Builder::class.'[where,first,insert]', [
+            m::mock(ConnectionInterface::class),
+            new Grammar,
+            m::mock(Processor::class),
+        ]);
+
+        $existingRecord = new stdClass();
+        $existingRecord->name = 'Existing User';
+        $existingRecord->email = '[email protected]';
+
+        $builder->shouldReceive('where')
+            ->once()
+            ->with(['email' => '[email protected]'])
+            ->andReturn(m::self());
+
+        $builder->shouldReceive('first')
+            ->once()
+            ->andReturn($existingRecord);
+
+        $builder->shouldNotReceive('insert');
+
+        $result = $builder->firstOrInsert(['email' => '[email protected]'], ['name' => 'New Name']);
+
+        $this->assertInstanceOf(stdClass::class, $result);
+        $this->assertEquals('Existing User', $result->name);
+        $this->assertEquals('[email protected]', $result->email);
+    }
+
+    public function testFirstOrInsertMethodRecordDoesNotExist()
+    {
+        $builder = m::mock(Builder::class.'[where,first,insert]', [
+            m::mock(ConnectionInterface::class),
+            new Grammar,
+            m::mock(Processor::class),
+        ]);
+
+        $insertedRecord = new stdClass();
+        $insertedRecord->name = 'New User';
+        $insertedRecord->email = '[email protected]';
+
+        $builder->shouldReceive('where')
+            ->twice()
+            ->with(['email' => '[email protected]'])
+            ->andReturn(m::self());
+
+        $builder->shouldReceive('first')
+            ->once()
+            ->andReturn(null);
+
+        $builder->shouldReceive('insert')
+            ->once()
+            ->with(['email' => '[email protected]', 'name' => 'New User'])
+            ->andReturn(true);
+
+        $builder->shouldReceive('first')
+            ->once()->andReturn($insertedRecord);
+
+        $result = $builder->firstOrInsert(['email' => '[email protected]'], ['name' => 'New User']);
+
+        $this->assertInstanceOf(stdClass::class, $result);
+        $this->assertEquals('New User', $result->name);
+        $this->assertEquals('[email protected]', $result->email);
+    }
+
     public function testDeleteMethod()
     {
         $builder = $this->getBuilder();