Hi Raphael,
It wouldnt break the existing behavioour because by default it should
continue to return False.
My point was we should be able to specify in the context what should be the
null value. If theres no null value specified, then work like how it works
now. (Return False)
Also the said problem (about [[ product.price_extra or "No extra cost!" ]])
doesnt exist because "" is treated as False by python.
Example:
>>> price_extra = ""
>>> print (price_extra or "No extra cost")
No extra cost
For python {},[],"",'' are all False type in logical operations
2009/12/8 Raphaël Valyi <[email protected]>
>
>> The generic issue IMHO is the open erp browse object/class which has two
>> problems:
>>
>> 1. raises an error when the expression is wrong eg.
>> user.partner_id.name (if partner id doesnt exist or is false it
>> returns err so we are forced to write user.partner_id and
>> user.partner_id.name)
>> 2. if a field is empty it return False, it should be possible to
>> selectively change what should be the return value if database/computed
>> value is null. So if we can selectively opt to choose like
>> self.pool.get('model').browse(cr,uid,ids,context={'null_value' = ''}) and
>> if
>> browse object respects this, there should be no problem.
>>
>> Sharoon, nice suggestion, and I agree for 1). However, for 2), returning
> "" instead of False would break a lot commonly used boolean expressions.
> For instance [[ product.price_extra or "No extra cost!" ]] would return ""
> rather than "No extra cost!" if we do what you propose. So I don't think
> this would be more user friendly than the current awkwardness.
> What I propose for 2) is a bit different. I propose that the expression
> evaluator, change False to "" but only at the expression level (once the
> whole [[ ]] block has been evaluated), not at the object attribute level
> which would screw up boolean expressions.
>
> Do you agree on this? Do you see any way of doing it?
>
> Raphaël Valyi
> http://www.akretion.com
>
--
Sharoon Thomas
Business Analyst & ERP Consultant
http://bit.ly/5FAJKU
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