Rename value() method to expression()

lib/Doctrine/MongoDB/Aggregation/Stage/Operator.php

@@ -271,6 +271,21 @@ public function eq($expression1, $expression2)
         return $this->operator('$eq', array($expression1, $expression2));
     }
 
+    /**
+     * Used to use an expression as field value. Can be any expression
+     *
+     * @see http://docs.mongodb.org/manual/meta/aggregation-quick-reference/#aggregation-expressions
+     * @param mixed|Operator $value
+     * @return $this
+     */
+    public function expression($value)
+    {
+        $this->requiresCurrentField();
+        $this->expr[$this->currentField] = $this->ensureArray($value);
+
+        return $this;
+    }
+
     /**
      * Set the current field for building the expression.
      *
@@ -748,20 +763,6 @@ public function toUpper($expression)
         return $this->operator('$toUpper', $expression);
     }
 
-    /**
-     * Used to set a value directly. Similar to $literal, except that the pipeline will parse any expressions contained.
-     *
-     * @param mixed|Operator $value
-     * @return $this
-     */
-    public function value($value)
-    {
-        $this->requiresCurrentField();
-        $this->expr[$this->currentField] = $this->ensureArray($value);
-
-        return $this;
-    }
-
     /**
      * Returns the week of the year for a date as a number between 0 and 53.
      *

tests/Doctrine/MongoDB/Tests/Aggregation/BuilderTest.php

@@ -106,7 +106,7 @@ public function testGetPipeline()
                 )
             ->group()
                 ->field('_id')
-                ->value('$user')
+                ->expression('$user')
                 ->field('numOrders')
                 ->sum(1)
                 ->field('totalAmount')