Doc comments at Mongo updated.

extensions/mongo/Collection.php

@@ -14,6 +14,40 @@ use Yii;
 /**
  * Collection represents the Mongo collection information.
  *
+ * A collection object is usually created by calling [[Database::getCollection()]] or [[Connection::getCollection()]].
+ *
+ * Collection provides the basic interface for the Mongo queries, mostly: insert, update, delete operations.
+ * For example:
+ *
+ * ~~~
+ * $collection = Yii::$app->mongo->getCollection('customer');
+ * $collection->insert(['name' => 'John Smith', 'status' => 1]);
+ * ~~~
+ *
+ * Mongo uses JSON format to specify query conditions with quite specific syntax.
+ * However Collection class provides the ability of "translating" common condition format used "yii\db\*"
+ * into Mongo condition.
+ * For example:
+ * ~~~
+ * $condition = [
+ *     ['AND', 'name', 'John'],
+ *     ['OR', 'status', [1, 2, 3]],
+ * ];
+ * print_r($collection->buildCondition($condition));
+ * // outputs :
+ * [
+ *     '$or' => [
+ *         'name' => 'John',
+ *         'status' => ['$in' => [1, 2, 3]],
+ *     ]
+ * ]
+ * ~~~
+ *
+ * To perform "find" queries, please use [[Query]] instead.
+ *
+ * @property string $name name of this collection. This property is read-only.
+ * @property string $fullName full name of this collection, including database name. This property is read-only.
+ *
  * @author Paul Klimov <klimov.paul@gmail.com>
  * @since 2.0
  */
@@ -62,7 +96,7 @@ class Collection extends Object
 	}
 
 	/**
-	 * Creates an index on the collection and the specified fields
+	 * Creates an index on the collection and the specified fields.
 	 * @param array|string $columns column name or list of column names.
 	 * If array is given, each element in the array has as key the field name, and as
 	 * value either 1 for ascending sort, or -1 for descending sort.
@@ -233,6 +267,8 @@ class Collection extends Object
 
 	/**
 	 * Updates the rows, which matches given criteria by given data.
+	 * Note: for "multiple" mode Mongo requires explicit strategy "$set" or "$inc"
+	 * to be specified for the "newData". If no strategy is passed "$set" will be used.
 	 * @param array $condition description of the objects to update.
 	 * @param array $newData the object with which to update the matching records.
 	 * @param array $options list of options in format: optionName => optionValue.
@@ -418,6 +454,20 @@ class Collection extends Object
 	 * Performs aggregation using Mongo "map reduce" mechanism.
 	 * Note: this function will not return the aggregation result, instead it will
 	 * write it inside the another Mongo collection specified by "out" parameter.
+	 * For example:
+	 *
+	 * ~~~
+	 * $customerCollection = Yii::$app->mongo->getCollection('customer');
+	 * $resultCollectionName = $customerCollection->mapReduce(
+	 *     'function () {emit(this.status, this.amount)}',
+	 *     'function (key, values) {return Array.sum(values)}',
+	 *     'mapReduceOut',
+	 *     ['status' => 3]
+	 * );
+	 * $query = new Query();
+	 * $results = $query->from($resultCollectionName)->all();
+	 * ~~~
+	 *
 	 * @param \MongoCode|string $map function, which emits map data from collection.
 	 * Argument will be automatically cast to [[\MongoCode]].
 	 * @param \MongoCode|string $reduce function that takes two arguments (the map key

extensions/mongo/Connection.php

@@ -12,10 +12,58 @@ use yii\base\InvalidConfigException;
 use Yii;
 
 /**
- * Class Connection
+ * Connection represents a connection to a MongoDb server.
+ *
+ * Connection works together with [[Database]] and [[Collection]] to provide data access
+ * to the Mongo database. They are wrappers of the [[MongoDB PHP extension]](http://us1.php.net/manual/en/book.mongo.php).
+ *
+ * To establish a DB connection, set [[dsn]] and then call [[open()]] to be true.
+ *
+ * The following example shows how to create a Connection instance and establish
+ * the DB connection:
+ *
+ * ~~~
+ * $connection = new \yii\mongo\Connection([
+ *     'dsn' => $dsn,
+ * ]);
+ * $connection->open();
+ * ~~~
+ *
+ * After the Mongo connection is established, one can access Mongo databases and collections:
+ *
+ * ~~~
+ * $database = $connection->getDatabase('my_mongo_db');
+ * $collection = $database->getCollection('customer');
+ * $collection->insert(['name' => 'John Smith', 'status' => 1]);
+ * ~~~
+ *
+ * You can work with several different databases at the same server using this class.
+ * However, while it is unlikely your application will actually need it, the Connection class
+ * provides ability to use [[defaultDatabaseName]] as well as a shortcut method [[getCollection()]]
+ * to retrieve a particular collection instance:
+ *
+ * ~~~
+ * // get collection 'customer' from default database:
+ * $collection = $connection->getCollection('customer');
+ * // get collection 'customer' from database 'mydatabase':
+ * $collection = $connection->getCollection(['mydatabase', 'customer']);
+ * ~~~
+ *
+ * Connection is often used as an application component and configured in the application
+ * configuration like the following:
+ *
+ * ~~~
+ * [
+ *	 'components' => [
+ *		 'mongo' => [
+ *			 'class' => '\yii\mongo\Connection',
+ *			 'dsn' => 'mongodb://developer:password@localhost:27017/mydatabase',
+ *		 ],
+ *	 ],
+ * ]
+ * ~~~
  *
  * @property boolean $isActive Whether the Mongo connection is established. This property is read-only.
- * @property QueryBuilder $queryBuilder The query builder for the current Mongo connection. This property
  * is read-only.
  *
  * @author Paul Klimov <klimov.paul@gmail.com>
@@ -30,8 +78,8 @@ class Connection extends Component
 	 * mongodb://[username:password@]host1[:port1][,host2[:port2:],...][/dbname]
 	 * For example:
 	 * mongodb://localhost:27017
-	 * mongodb://developer:somepassword@localhost:27017
-	 * mongodb://developer:somepassword@localhost:27017/mydatabase
+	 * mongodb://developer:password@localhost:27017
+	 * mongodb://developer:password@localhost:27017/mydatabase
 	 */
 	public $dsn;
 	/**
@@ -48,6 +96,8 @@ class Connection extends Component
 	public $options = [];
 	/**
 	 * @var string name of the Mongo database to use by default.
+	 * If this field left blank, connection instance will attempt to determine it from
+	 * [[options]] and [[dsn]] automatically, if needed.
 	 */
 	public $defaultDatabaseName;
 	/**

extensions/mongo/Database.php

@@ -54,14 +54,6 @@ class Database extends Object
 		]);
 	}
 
-	/**
-	 * Drops this database.
-	 */
-	public function drop()
-	{
-		$this->mongoDb->drop();
-	}
-
 	/**
 	 * Creates new collection.
 	 * Note: Mongo creates new collections automatically on the first demand,