Added count, average, sum, min, max, scalar methods to ActiveQuery.

docs/api/db/ActiveRecord.md

@@ -57,11 +57,10 @@ return array(
 
 ### Getting Data from Database
 
-There are three ActiveRecord methods for getting data:
+There are two ActiveRecord methods for getting data:
 
 - [[find()]]
 - [[findBySql()]]
-- [[count()]]
 
 They all return an [[ActiveQuery]] instance. Coupled with the various customization and query methods
 provided by [[ActiveQuery]], ActiveRecord supports very flexible and powerful data retrieval approaches.
@@ -88,9 +87,9 @@ $sql = 'SELECT * FROM tbl_customer';
 $customers = Customer::findBySql($sql)->all();
 
 // to return the number of *active* customers:
-$count = Customer::count()
+$count = Customer::find()
 	->where(array('status' => $active))
-	->value();
+	->count();
 
 // to return customers in terms of arrays rather than `Customer` objects:
 $customers = Customer::find()->asArray()->all();
@@ -222,10 +221,10 @@ subtotal exceeds certain amount:
 ~~~
 class Customer extends \yii\db\ActiveRecord
 {
-	public function getBigOrders()
+	public function getBigOrders($threshold = 100)
 	{
 		return $this->hasMany('Order', array('customer_id' => 'id'))
-			->where('subtotal > 100')
+			->where('subtotal > :threshold', array(':threshold' => $threshold))
 			->orderBy('id');
 	}
 }

framework/db/ActiveQuery.php

@@ -26,7 +26,12 @@ use yii\db\Exception;
  *
  * - [[one()]]: returns a single record populated with the first row of data.
  * - [[all()]]: returns all records based on the query results.
- * - [[value()]]: returns the value of the first column in the first row of the query result.
+ * - [[count()]]: returns the number of records.
+ * - [[sum()]]: returns the sum over the specified column.
+ * - [[average()]]: returns the average over the specified column.
+ * - [[min()]]: returns the min over the specified column.
+ * - [[max()]]: returns the max over the specified column.
+ * - [[scalar()]]: returns the value of the first column in the first row of the query result.
  * - [[exists()]]: returns a value indicating whether the query result has data or not.
  *
  * Because ActiveQuery extends from [[Query]], one can use query methods, such as [[where()]],
@@ -75,6 +80,24 @@ class ActiveQuery extends Query
 
 
 	/**
+	 * PHP magic method.
+	 * This method allows calling static method defined in [[modelClass]] via this query object.
+	 * It is mainly implemented for supporting the feature of scope.
+	 * @param string $name the method name to be called
+	 * @param array $params the parameters passed to the method
+	 * @return mixed the method return result
+	 */
+	public function __call($name, $params)
+	{
+		if (method_exists($this->modelClass, $name)) {
+			array_unshift($params, $this);
+			return call_user_func_array(array($this->modelClass, $name), $params);
+		} else {
+			return parent::__call($name, $params);
+		}
+	}
+
+	/**
 	 * Executes query and returns all results as an array.
 	 * @return array the query results. If the query results in nothing, an empty array will be returned.
 	 */
@@ -119,12 +142,72 @@ class ActiveQuery extends Query
 	}
 
 	/**
+	 * Returns the number of records.
+	 * @param string $q the COUNT expression. Defaults to '*'.
+	 * Make sure you properly quote column names.
+	 * @return integer number of records
+	 */
+	public function count($q = '*')
+	{
+		$this->select = array("COUNT($q)");
+		return $this->createCommand()->queryScalar();
+	}
+
+	/**
+	 * Returns the sum of the specified column values.
+	 * @param string $q the column name or expression.
+	 * Make sure you properly quote column names.
+	 * @return integer the sum of the specified column values
+	 */
+	public function sum($q)
+	{
+		$this->select = array("SUM($q)");
+		return $this->createCommand()->queryScalar();
+	}
+
+	/**
+	 * Returns the average of the specified column values.
+	 * @param string $q the column name or expression.
+	 * Make sure you properly quote column names.
+	 * @return integer the average of the specified column values.
+	 */
+	public function average($q)
+	{
+		$this->select = array("AVG($q)");
+		return $this->createCommand()->queryScalar();
+	}
+
+	/**
+	 * Returns the minimum of the specified column values.
+	 * @param string $q the column name or expression.
+	 * Make sure you properly quote column names.
+	 * @return integer the minimum of the specified column values.
+	 */
+	public function min($q)
+	{
+		$this->select = array("MIN($q)");
+		return $this->createCommand()->queryScalar();
+	}
+
+	/**
+	 * Returns the maximum of the specified column values.
+	 * @param string $q the column name or expression.
+	 * Make sure you properly quote column names.
+	 * @return integer the maximum of the specified column values.
+	 */
+	public function max($q)
+	{
+		$this->select = array("MAX($q)");
+		return $this->createCommand()->queryScalar();
+	}
+
+	/**
 	 * Returns the query result as a scalar value.
 	 * The value returned will be the first column in the first row of the query results.
 	 * @return string|boolean the value of the first column in the first row of the query result.
 	 * False is returned if the query result is empty.
 	 */
-	public function value()
+	public function scalar()
 	{
 		return $this->createCommand()->queryScalar();
 	}
@@ -136,7 +219,7 @@ class ActiveQuery extends Query
 	public function exists()
 	{
 		$this->select = array(new Expression('1'));
-		return $this->value() !== false;
+		return $this->scalar() !== false;
 	}
 
 	/**

framework/db/ActiveRecord.php

@@ -128,36 +128,6 @@ class ActiveRecord extends Model
 	}
 
 	/**
-	 * Creates a `COUNT` query for this AR class.
-	 *
-	 * Below are some usage examples:
-	 *
-	 * ~~~
-	 * // count the total number of customers
-	 * echo Customer::count()->value();
-	 * // count the number of active customers:
-	 * echo Customer::count()
-	 *     ->where(array('status' => 1))
-	 *     ->value();
-	 * // customize the count expression
-	 * echo Customer::count('COUNT(DISTINCT age)')->value();
-	 * ~~~
-	 *
-	 * @param string $q the count expression. If null, it means `COUNT(*)`.
-	 * @return ActiveQuery the newly created [[ActiveQuery]] instance
-	 */
-	public static function count($q = null)
-	{
-		$query = static::createQuery();
-		if ($q !== null) {
-			$query->select = array($q);
-		} elseif ($query->select === null) {
-			$query->select = array('COUNT(*)');
-		}
-		return $query;
-	}
-
-	/**
 	 * Updates the whole table using the provided attribute values and conditions.
 	 * For example, to change the status to be 1 for all customers whose status is 2:
 	 *
@@ -646,7 +616,7 @@ class ActiveRecord extends Model
 					$values[$key] = isset($this->_attributes[$key]) ? $this->_attributes[$key] : null;
 				}
 			}
-			$db = $this->getDbConnection();
+			$db = static::getDbConnection();
 			$command = $db->createCommand()->insert($this->tableName(), $values);
 			if ($command->execute()) {
 				$table = $this->getTableSchema();
@@ -1082,7 +1052,7 @@ class ActiveRecord extends Model
 			foreach ($extraColumns as $k => $v) {
 				$columns[$k] = $v;
 			}
-			$this->getDbConnection()->createCommand()
+			static::getDbConnection()->createCommand()
 				->insert($viaTable, $columns)->execute();
 		} else {
 			$p1 = $model->isPrimaryKey(array_keys($relation->link));
@@ -1153,7 +1123,7 @@ class ActiveRecord extends Model
 			foreach ($relation->link as $a => $b) {
 				$columns[$b] = $model->$a;
 			}
-			$command = $this->getDbConnection()->createCommand();
+			$command = static::getDbConnection()->createCommand();
 			if ($delete) {
 				$command->delete($viaTable, $columns)->execute();
 			} else {

tests/unit/data/ar/Customer.php

@@ -19,4 +19,9 @@ class Customer extends ActiveRecord
 	{
 		return $this->hasMany('Order', array('customer_id' => 'id'))->orderBy('id');
 	}
+
+	public static function active($query)
+	{
+		return $query->andWhere('status=1');
+	}
 }
\ No newline at end of file

tests/unit/framework/db/ActiveRecordTest.php

@@ -55,10 +55,17 @@ class ActiveRecordTest extends \yiiunit\MysqlTestCase
 		$this->assertEquals(3, $customer->id);
 		$this->assertEquals(4, $customer->status2);
 
-		// find count
-		$this->assertEquals(3, Customer::count()->value());
-		$this->assertEquals(2, Customer::find()->select('COUNT(*)')->where('id=1 OR id=2')->value());
-		$this->assertEquals(6, Customer::count('SUM(id)')->value());
+		// find count, sum, average, min, max, scalar
+		$this->assertEquals(3, Customer::find()->count());
+		$this->assertEquals(2, Customer::find()->where('id=1 OR id=2')->count());
+		$this->assertEquals(6, Customer::find()->sum('id'));
+		$this->assertEquals(2, Customer::find()->average('id'));
+		$this->assertEquals(1, Customer::find()->min('id'));
+		$this->assertEquals(3, Customer::find()->max('id'));
+		$this->assertEquals(3, Customer::find()->select('COUNT(*)')->scalar());
+
+		// scope
+		$this->assertEquals(2, Customer::find()->active()->count());
 
 		// asArray
 		$customer = Customer::find()->where('id=2')->asArray()->one();