Symfony 2 Variable Entity Naming

Question

I feel like this shouldn't be to hard, but try as I might, I keep getting errors.

What I'm wanting to do, is to have a single "add" function that will handle the basic functionality of adding records to any / all tables. Basically, the post data will contain the table name, as well as the fields / values to be inserted. The controller itself, confirms the user has access to do these things, and then verifies the fields are valid, before creating a new instance of the entity, that's where things go haywire:

$entityName = 'Products';
$row = new $entityName(); //doesn't work
$row new Products(); //works

I haven't found a way or any examples of creating a new entity using the Entity Manager, or else that might work, because i've created functions using EM to do queries, updates, and deletes, but I just can't get this to work with the add functions.

I am not sure if symfony2 is capable of this. You are trying to write your own code dinamically, you could try with php create a new file, write all the php class there and save it, and then execute with php app/console doctrine:schema:update... I am very doubtfull of the success though. — Cesc
– Cesc, Commented Dec 3, 2013 at 0:29
Drop the parens. $row = new $entityName; If that does not work then post the error message. Something else is going on. — Cerad
– Cerad, Commented Dec 3, 2013 at 14:51

Martin Lie · Accepted Answer · 2013-12-03 03:24:55Z

2

1. Your problem is almost certainly namespacing (see below). Try this instead:

$entityName = 'My\Bundle\Entity\Products';
$row = new $entityName();

Should work. ;)

2. If you want to create new instances using an EntityManager, try this:

$entityName = 'My\Bundle\Entity\Products';
$row = $em->getClassMetadata($entityName)->newInstance();

...assuming $em is your EntityManager. :-)

3. To "prove" that your problem is namespacing, try this in a plain .php file that you run from the command line:

namespace Foo;
class Test {}

$class1 = 'Foo\Test';
$class2 = 'Test';

$x = new Test();    // Will work
$y = new $class1(); // Will work
$z = new $class2(); // Will trigger "Class 'Test' not found" fatal error

edited Dec 3, 2013 at 3:24

answered Dec 3, 2013 at 3:17

Martin Lie

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user2816891 Over a year ago

I think the problem was a combination of my entity being a variable and having to escape my slashes. It works now like this $entity_name = 'Some\\bundle\\entity\\' . $entity; $row = new $entity_name(); Thanks for your help

Paul Andrieux · Accepted Answer · 2013-12-03 08:37:10Z

0

Two things:

Try with "Products" instead of 'Products'
I suppose that your entity Products has a namespace, it is required (even if you declared an use statement). So try with "My\Bundle\Entity\Products".

edited Dec 3, 2013 at 8:37

answered Dec 3, 2013 at 0:29

Paul Andrieux

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2 Comments

user2816891 Over a year ago

I've tried using the namespace to no avail. Again new Products(); works, but new $entityName doesn't.

Paul Andrieux Over a year ago

I've edited my answer, I wasn't clear, try with double quotes instead of simple quotes

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