When you have a model field with a choices option you tend to have some magic values associated with human readable names. Is there in Django a convenient way to set these fields by the human readable name instead of the value?
Consider this model:
class Thing(models.Model):
PRIORITIES = (
(0, 'Low'),
(1, 'Normal'),
(2, 'High'),
)
priority = models.IntegerField(default=0, choices=PRIORITIES)
At some point we have a Thing instance and we want to set its priority. Obviously you could do,
thing.priority = 1
But that forces you to memorize the Value-Name mapping of PRIORITIES. This doesn't work:
thing.priority = 'Normal' # Throws ValueError on .save()
Currently I have this silly workaround:
thing.priority = dict((key,value) for (value,key) in Thing.PRIORITIES)['Normal']
but that's clunky. Given how common this scenario could be I was wondering if anyone had a better solution. Is there some field method for setting fields by choice name which I totally overlooked?
ベストアンサー1
Do as seen here. Then you can use a word that represents the proper integer.
Like so:
LOW = 0
NORMAL = 1
HIGH = 2
STATUS_CHOICES = (
(LOW, 'Low'),
(NORMAL, 'Normal'),
(HIGH, 'High'),
)
Then they are still integers in the DB.
Usage would be thing.priority = Thing.NORMAL