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Code Issues 25 Releases Wiki Activity

Changed the way we create class names for deferred field models to avoid

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problems when people have hundreds of fields on model. Maximum class
name length is now 80 characters and uses a hash when necessary.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13819 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2010-09-13 05:08:10 +00:00
parent 4084bc7354
commit 17a79d5033
2 changed files with 7 additions and 5 deletions
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6
django/db/backends/util.py
View File

@ -105,15 +105,15 @@ def rev_typecast_decimal(d):
return None
return str(d)
def truncate_name(name, length=None):
def truncate_name(name, length=None, hash_len=4):
"""Shortens a string to a repeatable mangled version with the given length.
"""
if length is None or len(name) <= length:
return name
hash = md5_constructor(name).hexdigest()[:4]
hash = md5_constructor(name).hexdigest()[:hash_len]
return '%s%s' % (name[:length-4], hash)
return '%s%s' % (name[:length-hash_len], hash)
def format_number(value, max_digits, decimal_places):
"""

6
django/db/models/query_utils.py
View File

@ -9,6 +9,7 @@ circular import difficulties.
import weakref
from django.utils.copycompat import deepcopy
from django.db.backends import util
from django.utils import tree
from django.utils.datastructures import SortedDict
@ -262,9 +263,10 @@ def deferred_class_factory(model, attrs):
# The app_cache wants a unique name for each model, otherwise the new class
# won't be created (we get an old one back). Therefore, we generate the
# name using the passed in attrs. It's OK to reuse an old case if the attrs
# are identical.
# name using the passed in attrs. It's OK to reuse an existing class
# object if the attrs are identical.
name = "%s_Deferred_%s" % (model.__name__, '_'.join(sorted(list(attrs))))
name = util.truncate_name(name, 80, 32)
overrides = dict([(attr, DeferredAttribute(attr, model))
for attr in attrs])