Fixed unsetting relation bug.

framework/base/Component.php

@@ -251,7 +251,7 @@ class Component extends Object
 				}
 			}
 		}
-		throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '.' . $name);
+		throw new InvalidCallException('Unsetting an unknown or read-only property: ' . get_class($this) . '::' . $name);
 	}
 
 	/**

framework/db/BaseActiveRecord.php

@@ -303,14 +303,12 @@ abstract class BaseActiveRecord extends Model implements ActiveRecordInterface
 	{
 		if ($this->hasAttribute($name)) {
 			unset($this->_attributes[$name]);
-		} else {
-			if (isset($this->_related[$name])) {
+		} elseif (array_key_exists($name, $this->_related)) {
 			unset($this->_related[$name]);
 		} else {
 			parent::__unset($name);
 		}
 	}
-	}
 
 	/**
 	 * Declares a `has-one` relation.