Doctrine inheritance. Is there an easy way to get all child classes/tables for using them in a select field in symfony forms?
I just started to use symfony 1.4 and Doctrine. (Used 1.0 - 1.2 + Propel a lot before).
I thought to give Doctrine a try, because of the fast and huge Development process in the past.
Thanks to jwage ;-)
Im using Table Inheritance. This is a small portion of my schema.yml:
Articles: columns: id: type: integer(4) primary: true notnull: true autoincrement: true marken_id: type: integer(4) notnull: false user_id: type: integer(4) notnull: false address_id: type: integer(4) notnull: false
Vehicles: inheritance: extends: Articles type: concrete Rennfahrzeuge: columns: stvo: type: boolean notnull: false default: false inheritance: extends: Vehicles type: concrete Tourenwagen: inheritance: extends: Rennfahrzeuge type: column_aggregation keyField: type keyValue: 1
Sonstige: inheritance: extends: Rennfahrzeuge type: column_aggregation keyField: type keyValue: 6 Karts: inheritance: extends: Vehicles type: concrete TonyKart: inheritance: extends: Karts type: column_aggregation keyField: type keyValue: 1
Sonstige: inheritance: extends: Karts type: column_aggregation keyField: type keyValue: 9
Im now thinking of using a simple way to create a the right form.
The user should have to select fields at the top of the form (like you can see here : http://msm-esv.dyndns.org/frontend_dev.php/fahrzeuge/insert )
You should choose the "parent class" like Rennfahrzeuge or Karts and so on.
After that the user should choose the child class like Tourenwagen or Sonstige.
Then the page should reload and display the right form.
Is there any function in Doctrine to get the inheritated/child classes for displaying them in the second select field?
(e.g. Rennfahrzeuge has Tourenwagen,..,..., Sonstige and Karts has TonyKart,...,...,Sonstige)
After that i could create dynamically the assigned form class like:
$chooseMode = $request->getParameter('chooseMode').'Form'; $modeFormClass = new $chooseMode();
or i have thought about just setting the right model in the parent form class.
What are your thoughts? I would really appreciate any suggestions and help :-)
Thanks a lot,
Are there direct functions such as a Doctrine getSubclasses or a PHP get_children_of? Not that I've come across, in Doctrine or PHP. The closest I know about is the PHP function is_subclass which you could use while iterating through all of your possible classes.
Do your subclasses vary significantly from your main model? I only see one column variation in your examples above but I'm guessing that was just for brevity.
I realize the appeal of the structure you're attempting but it also seems like it could be an incredible pain in the long run. Would it be possible to instead set up a separate VehicleCategory model that referenced itself to provide a nested structure and then your Vehicles could belong to those categories? This would have Rennfahrzeuge as a top level category and Tourenwagen and Sonstige would be categories with a parent of Rennfahrzeuge with Vehicles belonging to all three. If you didn't have too much field variation in your child models you could include all of the custom fields in the Vehicles model and only display/set them at the appropriate times.
Just some thoughts, hope that helps.
If you need to find the subclasses of a Doctrine Record you could use $yourSuperObject->getTable()->getOption('subclasses') or Doctrine::getTable('SuperClass')->getOption('subclasses');