Delete Class Attributes

Francisco Maria Moyano Casco

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Mar 25, 2018, 10:37:42 AM3/25/18

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Hi,
I'm working on Tryton 4-2. I'm trying to delete some class attributes, due to a migration, but I had no success.

The code I use is the next one:
......
if table.column_exist('water'):
table.drop_column('water')
if hasattr(cls,'water'):
del cls.water
.......

Any clue why this doesn't work?

Thanks
Francisco

Cédric Krier

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Mar 25, 2018, 10:55:03 AM3/25/18

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Why are you deleting it? Just remove the definition from the class.

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Cédric Krier - B2CK SPRL
Email/Jabber: cedric...@b2ck.com
Tel: +32 472 54 46 59
Website: http://www.b2ck.com/

Francisco Maria Moyano Casco

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Mar 25, 2018, 4:11:38 PM3/25/18

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El domingo, 25 de marzo de 2018, 11:55:03 (UTC-3), Cédric Krier escribió:
> On 2018-03-25 07:37, Francisco Maria Moyano Casco wrote:
> > Hi,
> > I'm working on Tryton 4-2. I'm trying to delete some class attributes, due to a migration, but I had no success.
> >
> > The code I use is the next one:
> > ......
> > if table.column_exist('water'):
> > table.drop_column('water')
> > if hasattr(cls,'water'):
> > del cls.water
> > .......
> >
> > Any clue why this doesn't work?
>
> Why are you deleting it? Just remove the definition from the class.

Because, the attributes I want to remove are part of a module base class. So, if I remove the definifinition from it, next time the module would be update to a newer version, I will have to remove again.

Cédric Krier

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Mar 25, 2018, 5:30:04 PM3/25/18

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You can not remove field from other modules. This will break the other
module.

Nicolas Évrard

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Mar 25, 2018, 5:44:19 PM3/25/18

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* Francisco Maria Moyano Casco [2018-03-25 22:11 +0200]:

Why do you want to remove a field from a base module?

--
Nicolas Évrard - B2CK SPRL
E-mail/Jabber: nicolas...@b2ck.com

Francisco Maria Moyano Casco

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Mar 25, 2018, 5:51:13 PM3/25/18

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El domingo, 25 de marzo de 2018, 18:30:04 (UTC-3), Cédric Krier escribió:
> On 2018-03-25 13:11, Francisco Maria Moyano Casco wrote:
> > El domingo, 25 de marzo de 2018, 11:55:03 (UTC-3), Cédric Krier escribió:
> > > Why are you deleting it? Just remove the definition from the class.
> >
> > Because, the attributes I want to remove are part of a module base
> > class. So, if I remove the definifinition from it, next time the
> > module would be update to a newer version, I will have to remove
> > again.
>
> You can not remove field from other modules. This will break the other
> module.

Ok!

I'm sorry, but why it would break the other modules? Those fields that I want to remove, are not pointed or use by anyother module or report.

Cédric Krier

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Mar 25, 2018, 6:30:06 PM3/25/18

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On 2018-03-25 14:51, Francisco Maria Moyano Casco wrote:
> I'm sorry, but why it would break the other modules? Those fields that
> I want to remove, are not pointed or use by anyother module or report.

I guess if the module adds such field, it is because it is used.
If it is not really used, you should request to remove it.

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