On 20.01.2011, at 12:12, Bernhard Schussek wrote:

> 2011/1/20 Lukas Kahwe Smith <[email protected]>:
>> Is it really necessary to only allow setting validation groups via the 
>> constructor? This means that one is essentially forced to use a factory when 
>> one wants to support setting different validation groups for a single form.
> 
> Yes, although the explanation why that is so is a bit lengthy. In
> short: The state of a form shouldn't be changed after its construction
> because this leads to potential bugs.
> 
> Why is this a problem for you?


Like I said, if I have a form which I want to use with different validation 
groups I now either have to:
- define one service for each group permutation
- define a factory service that makes the form instances

Now if we disallow setting options via setters, then I think we should make 
that factory service the _only_ way to make form instances. Aka make the 
constructor protected and provide a form creation service as part of Symfony2 
core.

regards,
Lukas Kahwe Smith
[email protected]



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