PHP 7 MongoDB - 删除所有数据库

Question

I'm trying to unit test my mongodb methods, thus I need a tearDown() method to flush my entire mongo database after testing.

Here is the function:

public function tearDown()
{
    $databases = $this->mongoClient->listDatabases();
    foreach ($databases as $db) {
        $db.dropDatabase();
    }
}

However it can't see the method on my $db.

Error: Call to undefined function Api\Test\Unit\dropDatabase()

It seems listDatabases() only return some information model of my dbs, not the actual databases themselves:

/var/www/html/tests/backend/Service/MongoStorageTest.php:35:
class MongoDB\Model\DatabaseInfo#1563 (3) {
  public $name =>
  string(5) "local"
  public $sizeOnDisk =>
  double(83886080)
  public $empty =>
  bool(false)
}

/var/www/html/tests/backend/Service/MongoStorageTest.php:35:
class MongoDB\Model\DatabaseInfo#1483 (3) {
  public $name =>
  string(2) "db"
  public $sizeOnDisk =>
  double(83886080)
  public $empty =>
  bool(false)
}

Is there any practical or simple way to really select them, or just drop everything with one method?

Answer 1

The method to drop is actually on MongoClient, and of course there is getName() from the MongoDB\Model\DatabaseInfo types that are returned from listDatabases()

public function tearDown()
{
    $databases = $this->mongoClient->listDatabases();
    foreach ($databases as $db) {
        $this->mongoClient->dropDatabase($db->getName());
    }
}

Alternately you could selectDatabase() and use the drop() method on MongoDB\Database:

public function tearDown()
{
    $databases = $this->mongoClient->listDatabases();
    foreach ($databases as $db) {
        $this->mongoClient->selectDatabase($db->getName())->drop();
    }
}

But to my mind that's a little more terse, and the first form feels more expressive.

Being that a "database" is a base container for namespace, then there actually is no command to "drop everything". Listing and looping the list is how you do it. Bottom line is if it's not in the "command reference", then there is no such thing.