Hi,
It's probably better to handle the default in the save() method.
def save(self, **kwargs):
if not self.id:
self.id = get_entity_id()
super(Entity, self).save(**kwargs)
Or, better yet, just remove the "id = models.BigIntegerField" line
completely and let django give you a models.AutoField which should properly
auto-increment.
Collin
On Monday, December 15, 2014 7:45:47 AM UTC-5, Gerald Klein wrote:
>
> if I remove the parens, when I submit to create the new entity is throws a
> validation error that does not specify the field that is wrong, "Please
> correct the error below."
>
> --jerry
>
> On Mon, Dec 15, 2014 at 6:20 AM, Daniel Roseman <dan...@roseman.org.uk
> <javascript:>> wrote:
>>
>> On Monday, 15 December 2014 11:04:13 UTC, Gerald Klein wrote:
>>>
>>>
>>>
>>> Daniel,
>>> I didn't include any code as I didn't do anything unusual but if you
>>> think that would help here it is.I was hoping that there was some ordinary
>>> theoretical basis for this as I didn't do anything custom really, aside
>>> from the id generation for the "Entity" class, which I generate the id
>>> manually much like an Oracle sequence object, I do this in order to
>>> facilitate the creation of relationships between arbitrary objects.
>>>
>>
>> But that "aside" is of course the entire problem.
>>
>> class Entity(models.Model):
>>> """ the fName field is also the company name field """
>>> id = models.BigIntegerField(primary_key=True, unique=True,
>>> default=get_entity_id())
>>>
>>
>> Leaving aside whatever reasons you have for doing this very odd thing,
>> the error is clear: you've called the get_entity_id function in the
>> definition, which means it is executed at first import time, so every
>> instance of Entity gets the same ID as its default. If you're using a
>> function to provide a default value, you must always pass the *callable*,
>> like this:
>>
>> id = models.BigIntegerField(primary_key=True, unique=True,
>> default=get_entity_id)
>>
>> ie without the calling brackets.
>>
>> But I strongly recommend you don't do this. Whatever you mean by
>> "facilitating the creation of relationships between arbitrary objects",
>> there is almost certainly a better way to do it in Django.
>> --
>> DR.
>>
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>
>
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> Gerald Klein DBA
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