Refactor and fix default database detection from dsn or database config

Refactored default database function which detects based on db config or tries to detect it from dsn

src/Jenssegers/Mongodb/Connection.php

@@ -4,6 +4,7 @@ namespace Jenssegers\Mongodb;
 
 use Illuminate\Database\Connection as BaseConnection;
 use Illuminate\Support\Arr;
+use InvalidArgumentException;
 use MongoDB\Client;
 
 class Connection extends BaseConnection
@@ -37,8 +38,11 @@ class Connection extends BaseConnection
         // Create the connection
         $this->connection = $this->createConnection($dsn, $config, $options);
 
+        // Get default database name
+        $default_db = $this->getDefaultDatabaseName($dsn, $config);
+
         // Select database
-        $this->db = $this->connection->selectDatabase($this->getDatabaseDsn($dsn, $config['database']));
+        $this->db = $this->connection->selectDatabase($default_db);
 
         $this->useDefaultPostProcessor();
 
@@ -114,6 +118,27 @@ class Connection extends BaseConnection
         return $this->getMongoDB()->getDatabaseName();
     }
 
+    /**
+     * Get the name of the default database based on db config or try to detect it from dsn
+     * @param string $dsn
+     * @param array $config
+     * @return string
+     * @throws InvalidArgumentException
+     */
+    protected function getDefaultDatabaseName($dsn, $config)
+    {
+        if(empty($config['database'])){
+
+            if (preg_match('/^mongodb:\\/\\/.+\\/([^?&]+)/s', $dsn, $matches)) {
+                $config['database'] = $matches[1];
+            } else {
+                throw new InvalidArgumentException("Database is not properly configured.");
+            }
+        }
+
+        return $config['database'];
+    }
+
     /**
      * Create a new MongoDB connection.
      * @param string $dsn
@@ -191,18 +216,6 @@ class Connection extends BaseConnection
         return 'mongodb://' . implode(',', $hosts) . ($auth_database ? '/' . $auth_database : '');
     }
 
-    /**
-     * Get database name from DSN string, if there is no database in DSN path - returns back $database argument.
-     * @param string $dsn
-     * @param $database
-     * @return string
-     */
-    protected function getDatabaseDsn($dsn, $database)
-    {
-        $dsnDatabase = trim(parse_url($dsn, PHP_URL_PATH), '/');
-        return trim($dsnDatabase) ? $dsnDatabase : $database;
-    }
-
     /**
      * Create a DSN string from a configuration.
      * @param array $config

tests/ConnectionTest.php

@@ -32,6 +32,15 @@ class ConnectionTest extends TestCase
         $this->assertInstanceOf(\MongoDB\Client::class, $connection->getMongoClient());
     }
 
+    public function testDsnDb()
+    {
+        $connection = DB::connection('dsn_mongodb_db');
+        $this->assertInstanceOf(\MongoDB\Database::class, $connection->getMongoDB());
+
+        $connection = DB::connection('dsn_mongodb_db');
+        $this->assertInstanceOf(\MongoDB\Client::class, $connection->getMongoClient());
+    }
+
     public function testCollection()
     {
         $collection = DB::connection('mongodb')->getCollection('unittest');

tests/TestCase.php

@@ -53,6 +53,7 @@ class TestCase extends Orchestra\Testbench\TestCase
         $app['config']->set('database.connections.mongodb', $config['connections']['mongodb']);
         $app['config']->set('database.connections.mongodb2', $config['connections']['mongodb']);
         $app['config']->set('database.connections.dsn_mongodb', $config['connections']['dsn_mongodb']);
+        $app['config']->set('database.connections.dsn_mongodb_db', $config['connections']['dsn_mongodb_db']);
 
         $app['config']->set('auth.model', 'User');
         $app['config']->set('auth.providers.users.model', 'User');

tests/config/database.php

@@ -21,6 +21,11 @@ return [
             'database' => env('MONGO_DATABASE', 'unittest'),
         ],
 
+        'dsn_mongodb_db' => [
+            'driver' => 'mongodb',
+            'dsn' => "mongodb://$mongoHost:$mongoPort/" . env('MONGO_DATABASE', 'unittest'),
+        ],
+
         'mysql' => [
             'driver' => 'mysql',
             'host' => env('MYSQL_HOST', 'mysql'),