#23854: Add custom SelectRelated classes
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Reporter: akaariai | Owner: nobody
Type: New feature | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by spectras):
Another use case for custom select related: selecting a specific item of a
m2m relation with a through model.
{{{
class Item(Model):
# stuff here
class Group(Model):
items = ManyToManyField(Item, through='GroupItem')
class GroupItem(Model):
group = ForeignKey(group)
item = ForeignKey(item)
order = PositiveIntegerField()
class Meta:
unique_together = [('group', 'item'), ('group', 'order')]
}}}
A way to `select_related` the item that has `order==0` would prove very
useful.
--
Ticket URL: <https://code.djangoproject.com/ticket/23854#comment:6>
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