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