Symfony2 and Doctrine - Error: Invalid PathExpression. Must be a StateFieldPathExpression

Question

I have an entity that looks like this:

/**
 * @Gedmo\\Tree(type=\"nested\")
 * @ORM\\Table(name=\"categories\")
 * @ORM\\Entity()
 */
class Category extends          


        

Answer 1

You can use the currently undocumented IDENTITY function to select the FK IDs in a query:

SELECT IDENTITY(c.parent) ...