2015-05-30 9:59 GMT+02:00 Christophe (net) <[email protected]>:
>
>
> Le 28/05/2015 18:00, Marc Murray a écrit :
>
>> On Thu, 2015-05-28 at 11:55 +0200, Christophe (net) wrote:
>>
>>> Le 28/05/2015 11:46, Cédric Krier a écrit :
>>>
>>>> On 28 May 11:10, Christophe (net) wrote:
>>>>
>>>>> Le 28/05/2015 10:34, Cédric Krier a écrit :
>>>>>
>>>>>> On 28 May 10:18, Christophe (net) wrote:
>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> I try to find out when I create a new address on a party if this is
>>>>>>> the
>>>>>>> first or not. Depending on the answer it must set a boolean in the
>>>>>>> address
>>>>>>> object.
>>>>>>> I seek from the method of class 'default_<name_of_field>' has
>>>>>>> reached the
>>>>>>> values of current instance. There is a way to do that (I am in v3.0)
>>>>>>> ?
>>>>>>>
>>>>>>
>>>>>> It sounds strange because addresses are already ordered by the field
>>>>>> sequence.
>>>>>> And moreover using the default value will not work properly with
>>>>>> concurrency.
>>>>>>
>>>>>
>>>>> Bizarre, on my installation the sequence field of the object
>>>>> party.address
>>>>> is empty, I would forget something?
>>>>>
>>>>
>>>> Because it is done like that by design.
>>>> The order is on (sequence, id).
>>>>
>>>
>>> Ok, but to return to my original question, is it possible (and how) to
>>> reach the values of the instance from a class method?
>>> Is there an example somewhere ?
>>>
>>>
>> If you know any other object-oriented programming language, you would
>> understand why your question is strange. By definition, a classmethod is
>> a method that runs at the level of the class object itself. Not an
>> instance. As a result, there is no way to access instance attributes
>> from a class method.
>>
>
> I understand, but my question was not about the object-oriented languages
> and their possibility, but was around Tryton. There is in the context or
> elsewhere the opportunity to catch the current record when the method to
> set the default value is executed (and as the initialization method of
> default values is either '@staticmethod' or '@classmethod ...)
>
>
>> From your description though, you may want to look into the on_change_*
>> and on_change_with_* methods. They will allow you to access instance
>> values. But, I think they'll only allow access to the fields specified
>> in the @fields.depends descriptor or the depends attribute of the field.
>>
>
> If I understand correctly, this is an action on the client triggers the
> 'on_change' not the server and not when assigning default values. I look at
> the trigger conditions of the on_change_with_*
you can try adding the 'addresses' in addresses field context (I didn't try
it, I don't know if it will work correctly).
Put something like that in party setup() method:
cls.addresses.context['party_addresses'] = Eval('addresses')
and in default_xxx():
Transaction().context.get('party_addresses')
--
Guillem Barba
http://www.guillem.alcarrer.net
