Started FAQ

en/index.rst

@@ -11,6 +11,7 @@ Reference Guide
    reference/introduction
    reference/architecture
    reference/configuration
+   reference/faq
    reference/basic-mapping
    reference/association-mapping
    reference/inheritance-mapping

en/reference/faq.rst

@@ -0,0 +1,124 @@
+Frequently Asked Questions
+==========================
+
+.. note::
+
+    This FAQ is a work in progress. We will add lots of questions and not answer them right away just to remember
+    what is often asked. If you stumble accross an unanswerd question please write a mail to the mailing-list or
+    join the #doctrine channel on Freenode IRC.
+
+Entity Classes
+--------------
+
+I access a variable and its null, what is wrong?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Proxy, not use public. Private and protected variables instead.
+
+How can I add default values to a column?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Doctrine does not support to set the default values in columns through the "DEFAULT" keyword in SQL.
+This is not necessary however, you can just use your class properties as default values. These are then used
+upon insert:
+
+.. code-block::
+
+    class User
+    {
+        const STATUS_DISABLED = 0;
+        const STATUS_ENABLED = 1;
+
+        private $algorithm = "sha1";
+        private $status = self:STATUS_DISABLED;
+    }
+
+.
+
+Mapping
+-------
+
+Why do I get exceptions about unique constraint failures during ``$em->flush()``?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-
+
+Associations
+------------
+
+What is wrong when I get an InvalidArgumentException "A new entity was found through the relationship.."?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+
+How can I filter an association?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Natively you can't in 2.0 and 2.1. You should use DQL queries to query for the filtered set of entities.
+
+I call clear() on a One-To-Many collection but the entities are not deleted
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+How can I add columns to a many-to-many table?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+
+How can i paginate fetch-joined collections?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+Why does pagination not work correctly with fetch joins?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+Inheritance
+-----------
+
+Can I use Inheritance with Doctrine 2?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ 
+.
+
+EntityGenerator
+---------------
+
+Why does the EntityGenerator not do X?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+Why does the EntityGenerator not generate inheritance correctly?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+
+
+.
+
+Performance
+-----------
+
+Why is an extra SQL query executed every time I fetch an entity with a one-to-one relation?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.
+
+Doctrine Query Language
+-----------------------
+
+What is DQL and why does it have such a strange syntax?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Can I sort by a function (for example ORDER BY RAND()) in DQL?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+No, it is not supported to sort by function in DQL. If you need this functionality you should either
+use a native-query or come up with another solution. As a side note: Sorting with ORDER BY RAND() is painfully slow
+starting with 1000 rows.
+