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[1.8.x] Refs #14030 -- Renamed CombinableMixin to Combinable

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Removed unused method and updated docstrings.

Backport of 14d0bd67d4 from master
This commit is contained in:
Josh Smeaton 2015-01-27 13:42:48 +11:00
parent 6c68e40e6e
commit f858b51ee3
1 changed files with 3 additions and 5 deletions
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8
django/db/models/expressions.py
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@ -11,7 +11,7 @@ from django.utils import timezone
from django.utils.functional import cached_property
class CombinableMixin(object):
class Combinable(object):
"""
Provides the ability to combine one or two objects with
some connector. For example F('foo') + F('bar').
@ -184,6 +184,7 @@ class BaseExpression(object):
in this query
* reuse: a set of reusable joins for multijoins
* summarize: a terminal aggregate clause
* for_save: whether this expression about to be used in a save or update
Returns: an ExpressionNode to be added to the query.
"""
@ -297,9 +298,6 @@ class BaseExpression(object):
return agg, lookup
return False, ()
def prepare_database_save(self, field):
return self
def get_group_by_cols(self):
if not self.contains_aggregate:
return [self]
@ -325,7 +323,7 @@ class BaseExpression(object):
return self
class ExpressionNode(BaseExpression, CombinableMixin):
class ExpressionNode(BaseExpression, Combinable):
"""
An expression that can be combined with other expressions.
"""