#25143: ArrayField should implement from_db_value()
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Reporter: Odahi | Owner:
Type: Bug | Status: new
Component: contrib.postgres | Version: 1.8
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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I'm using a custom field with the new Postgres {{{ArrayField}}}:
{{{
class Tag(object):
def __init__(self, id):
self.id = id
def __unicode__(self):
return U"Tag(%d)" % self.id
class TagField(models.SmallIntegerField):
# Dummy wrapper over SmallIntegerField.
def from_db_value(self, value, expression, connection, context):
if value is None:
return value
return Tag(int(value))
def get_prep_value(self, value):
return value
...
# models.py
class Recommendation(models.Model):
tags = ArrayField(TagField(), size=3)
def __unicode__(self):
return self.tags
}}}
Then
{{{
>>> Recommendation.objects.create(tags=[Tag(1), Tag(2)])
>>> Recommendation.objects.all()
[<Recommendation: [1, 2]>] # WRONG
}}}
But this is wrong because I got Integers instead of Tag objects:
{{{
[<Recommendation: [Tag(1), Tag(2)]>] # OK
}}}
Looking at the {{{ArrayField}}} source code seems that {{{to_python()}}}
is implemented but never called. I think {{{from_db_value()}}} should be
also implemented.
--
Ticket URL: <https://code.djangoproject.com/ticket/25143>
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