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[1.11.x] Refs #27935 -- Fixed BrinIndex.max_name_length if a project's default database isn't PostgreSQL.

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Thanks Florian Apolloner for the report.

Backport of 2867b7eb4b8477710f11707d4b975db10e5f91a7 from master
This commit is contained in:
Mariusz Felisiak 2017-03-20 16:21:01 +01:00 committed by Tim Graham
parent 0b93a992e5
commit 40b843488a
1 changed files with 5 additions and 10 deletions
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15
django/contrib/postgres/indexes.py
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@ -1,14 +1,17 @@
from __future__ import unicode_literals from __future__ import unicode_literals
from django.db import connection
from django.db.models import Index from django.db.models import Index
from django.utils.functional import cached_property
__all__ = ['BrinIndex', 'GinIndex'] __all__ = ['BrinIndex', 'GinIndex']
class BrinIndex(Index): class BrinIndex(Index):
suffix = 'brin' suffix = 'brin'
# Allow an index name longer than 30 characters since the suffix is 4
# characters (usual limit is 3). Since this index can only be used on
# PostgreSQL, the 30 character limit for cross-database compatibility isn't
# applicable.
max_name_length = 31
def __init__(self, fields=[], name=None, pages_per_range=None): def __init__(self, fields=[], name=None, pages_per_range=None):
if pages_per_range is not None and pages_per_range <= 0: if pages_per_range is not None and pages_per_range <= 0:
@ -38,14 +41,6 @@ class BrinIndex(Index):
schema_editor.quote_value(self.pages_per_range)) + parameters['extra'] schema_editor.quote_value(self.pages_per_range)) + parameters['extra']
return parameters return parameters
@cached_property
def max_name_length(self):
# Allow an index name longer than 30 characters since the suffix
# is 4 characters (usual limit is 3). Since this index can only be
# used on PostgreSQL, the 30 character limit for cross-database
# compatibility isn't applicable.
return connection.ops.max_name_length()
class GinIndex(Index): class GinIndex(Index):
suffix = 'gin' suffix = 'gin'