Update Connection.php for add +srv (mongodb+srv)

[metola]

Fix issue #304
This is need if you create a cloud cluster https://cloud.mongodb.com/ and need conection mongodb+srv

Q	A
Is bugfix?	yes
New feature?	yes
Breaks BC?	no
Tests pass?	no
Fixed issues	#304

[samdark]

Suggested change

	if (preg_match('/^mongodb(:|\+srv:)\\/\\/.+\\/([^?&]+)/s', $this->dsn, $matches)) {
	$this->_defaultDatabaseName = $matches[2];
	if (preg_match('/^mongodb(?:\+srv)?:\\/\\/.+\\/([^?&]+)/s', $this->dsn, $matches)) {
	$this->_defaultDatabaseName = $matches[1];

[samdark]

Also need a line for CHANGELOG.md

[ziaratban]

i think it is not a good way, because a variety of mongodb connection string patterns exist.(Standalone & Replica Set & Shard).

the defaultDatabaseName parameter is required for better performance and compatibility.

https://docs.mongodb.com/manual/reference/connection-string/

[metola]

Hi @ziaratban ,
what do you think is the best way to approach it?

[ziaratban]

hi @metola ,
I think the best solution is to not customize this part. this part must be set by programmer.

return [
    'class' => 'yii\mongodb\Connection',
    'dsn' => 'mongodb://any syntax',
    'defaultDatabaseName' => 'myDB', // <<<< required 
    'enableLogging' => YII_ENV === 'dev',
    'enableProfiling' => YII_ENV === 'dev',
];

[metola]

Hi @ziaratban ,
Thanks, with this worlk well.