#23363: Field length in ORM
-------------------------------------+-------------------------------------
Reporter: qurben | Owner: nobody
Type: New feature | Status: closed
Component: Database layer | Version: 1.6
(models, ORM) | Resolution:
Severity: Normal | worksforme
Keywords: ORM, order_by, | Triage Stage:
QuerySet | Unreviewed
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 jarshwah):
I don't think custom lookups and transforms works for this use case. The
ticket reporter wants to include that information in the select list.
Transforms and Lookups are only really used in filter clauses at the
moment.
There is a PR that will allow this kind of functionality here:
https://github.com/django/django/pull/2496
And to implement the length function, you'd create an object such as:
{{{
class Length(Func):
function = 'LENGTH'
def as_mssql(self, compiler, query):
self.function = 'LEN'
return super(Length, self).as_sql(compiler, query)
MyModel.objects.annotate(length=Length('myfield'))
}}}
I'm reopening on the basis that lookups and transforms don't solve the
problem.
--
Ticket URL: <https://code.djangoproject.com/ticket/23363#comment:2>
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