Re: change min_length in form __init__?

2012-01-13 Thread Alasdair Nicol 

On 13/01/12 10:47, bruno desthuilliers wrote:

On Jan 11, 12:15 pm, galgal  wrote:

Is there any way, to change the field's *min_length* argument inside form
constructor? That doesn't work:

def __init__(self, *args, **kwargs):
 super(CreateTeamForm, self).__init__(*args, **kwargs)
 self.fields['primary_color'].min_length = 4

Assuming primary_color is a CharField, this should theoretically
JustWork AFAICT. What is the result ? ("doesn't work" is not really
descriptive...)


Hi Bruno,

I answered this question on Stack Overflow earlier this week [1].

When a field with min_length is initialised, a MinLengthValidator is 
added to the its validators. So if you set the min_length attribute 
after calling parent classes __init__ method, it is 'too late' for it to 
have any effect.


The solution is to change the field's validators in the __init__ method 
instead,


Cheers,
Alasdair

[1]: 
http://stackoverflow.com/questions/8818261/django-change-min-length-in-form-init/


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Alasdair Nicol
Developer, MEMSET

mail: alasd...@memset.com
 web: http://www.memset.com/

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Re: change min_length in form __init__?

2012-01-13 Thread bruno desthuilliers 
On Jan 11, 12:15 pm, galgal  wrote:
> Is there any way, to change the field's *min_length* argument inside form
> constructor? That doesn't work:
>
> def __init__(self, *args, **kwargs):
>     super(CreateTeamForm, self).__init__(*args, **kwargs)
>     self.fields['primary_color'].min_length = 4

Assuming primary_color is a CharField, this should theoretically
JustWork AFAICT. What is the result ? ("doesn't work" is not really
descriptive...)

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Re: change min_length in form __init__?

2012-01-13 Thread bruno desthuilliers 
On Jan 13, 7:02 am, Wen 温业逵Yekui  wrote:
> why you use the "*" in your function argument?
>
Because it's the sensible thing to do here - cf
http://docs.python.org/release/2.6.7/tutorial/controlflow.html#more-on-defining-functions


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Re: change min_length in form __init__?

2012-01-12 Thread Wen 温业逵Yekui 
why you use the "*" in your function argument?

2012/1/11 galgal 

> Is there any way, to change the field's *min_length* argument inside form
> constructor? That doesn't work:
>
> def __init__(self, *args, **kwargs):
>> super(CreateTeamForm, self).__init__(*args, **kwargs)
>> self.fields['primary_color'].min_length = 4
>
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change min_length in form __init__?

2012-01-11 Thread galgal 
Is there any way, to change the field's *min_length* argument inside form 
constructor? That doesn't work:

def __init__(self, *args, **kwargs):
> super(CreateTeamForm, self).__init__(*args, **kwargs)
> self.fields['primary_color'].min_length = 4

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