On Wed, Jul 17, 2013 at 9:44 AM, Björn Rylander hassl...@gmail.com wrote:
I'm a little confused regarding the proper ZF2 pattern for object
instantiation. I had come to the conclusion that all objects should be
instantiated with factories. But looking at the Album tutorial I can see
that the Album object and the AlbumForm object are directly instantiated in
the AlbumController::addAction(). So, what is the ZF2 pattern for
instantiating objects? Is there a rule when factories should be used or not
used?
The rules of thumb are:
- will I need the same instance, OR
- will I need an instance using non-trivial instantiation (e.g.,
wanting to tie into existing initializers), OR
- will I need to be able to substitute an extending class/alternate
implementation
If the answer is any of the above is yes, it's likely a service, and
should be managed by the ServiceManager.
In the tutorial, the form is only used in one location, and has a very
specific set of rules. Tthe Album object is a result of querying the
database; we provide a _prototype_ instance that the result set can
hydrate when results are available.
If the object is a result of calculation, or a one-off, direct
instantiation is fine, and encouraged.
--
Matthew Weier O'Phinney
Project Lead| matt...@zend.com
Zend Framework | http://framework.zend.com/
PGP key: http://framework.zend.com/zf-matthew-pgp-key.asc
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