Changes between Version 13 and Version 14 of DjangoOnWindows


Ignore:
Timestamp:
Sep 3, 2008, 4:24:48 PM (16 years ago)
Author:
Ramiro Morales
Comment:

Move test suite result details to its own page

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  • DjangoOnWindows

    v13 v14  
    77== Development ==
    88
    9 === Test suite failures ===
    10 
    11 As of r8889 (1.0rc1), the test suite is showing the following failure(s) when run under Windows (XP 32 bits) + official Python 2.5.2:
    12 
    13  * Ticket #7570 when using the sqlite3 Django DB backend (official Python 2.5.2 Windows distribution includes SQLite 3.3.4).
    14 
    15 ==== ticket #7570 ====
    16 
    17 This test (and other two similar tests) fails:
    18 
    19 {{{
    20 #!python
    21 Bug #7087 -- dates with extra select columns
    22 >>> Item.objects.dates('created', 'day').extra(select={'a': 1})
    23 [datetime.datetime(2007, 12, 19, 0, 0), datetime.datetime(2007, 12, 20, 0, 0)]
    24 }}}
    25 
    26 Error is:
    27 
    28 {{{
    29 ======================================================================
    30 FAIL: Doctest: regressiontests.queries.models.__test__.API_TESTS
    31 ----------------------------------------------------------------------
    32 Traceback (most recent call last):
    33   File "C:\ramiro\django-trunk\django\test\_doctest.py", line 2180, in runTest
    34     raise self.failureException(self.format_failure(new.getvalue()))
    35 AssertionError: Failed doctest test for regressiontests.queries.models.__test__.API_TESTS
    36   File "C:\ramiro\django-trunk\tests\regressiontests\queries\models.py", line unknown line number, in API_TESTS
    37 
    38 ----------------------------------------------------------------------
    39 File "C:\ramiro\django-trunk\tests\regressiontests\queries\models.py", line ?, in regressiontests.queries.models.__test__.API_TESTS
    40 Failed example:
    41     Item.objects.dates('created', 'day').extra(select={'a': 1})
    42 Exception raised:
    43     Traceback (most recent call last):
    44       File "C:\ramiro\django-trunk\django\test\_doctest.py", line 1267, in __run
    45         compileflags, 1) in test.globs
    46       File "<doctest regressiontests.queries.models.__test__.API_TESTS[169]>", line 1, in <module>
    47         Item.objects.dates('created', 'day').extra(select={'a': 1})
    48       File "c:\ramiro\django-trunk\django\db\models\query.py", line 129, in __repr__
    49         return repr(list(self))
    50       File "c:\ramiro\django-trunk\django\db\models\query.py", line 141, in __len__
    51         self._result_cache.extend(list(self._iter))
    52       File "c:\ramiro\django-trunk\django\db\models\sql\subqueries.py", line 351, in results_iter
    53         for rows in self.execute_sql(MULTI):
    54       File "c:\ramiro\django-trunk\django\db\models\sql\query.py", line 1607, in execute_sql
    55         cursor.execute(sql, params)
    56       File "c:\ramiro\django-trunk\django\db\backends\sqlite3\base.py", line 136, in execute
    57         return Database.Cursor.execute(self, query, params)
    58     OperationalError: ORDER BY terms must not be non-integer constants
    59 
    60 
    61 ----------------------------------------------------------------------
    62 Ran 253 tests in 433.032s
    63 
    64 FAILED (failures=1)
    65 }}}
    66 
    67 A minimal models.py file that shows the problem (extracted from the above regression test):
    68 
    69 {{{
    70 #!python
    71 """
    72 >>> time1 = datetime.datetime(2007, 12, 19, 22, 25, 0)
    73 >>> time2 = datetime.datetime(2007, 12, 19, 21, 0, 0)
    74 >>> time3 = datetime.datetime(2007, 12, 20, 22, 25, 0)
    75 >>> time4 = datetime.datetime(2007, 12, 20, 21, 0, 0)
    76 >>> i1 = Item(name='one', created=time1, modified=time1)
    77 >>> i1.save()
    78 >>> i2 = Item(name='two', created=time2)
    79 >>> i2.save()
    80 >>> i3 = Item(name='three', created=time3)
    81 >>> i3.save()
    82 >>> i4 = Item(name='four', created=time4)
    83 >>> i4.save()
    84 
    85 >>> Item.objects.dates('created', 'day').extra(select={'a': 1})
    86 [datetime.datetime(2007, 12, 19, 0, 0), datetime.datetime(2007, 12, 20, 0, 0)]
    87 
    88 """
    89 
    90 from django.db import models
    91 import datetime
    92 
    93 class Item(models.Model):
    94     name = models.CharField(max_length=10)
    95     created = models.DateTimeField()
    96     modified = models.DateTimeField(blank=True, null=True)
    97 
    98     class Meta:
    99         ordering = ['name']
    100 
    101     def __unicode__(self):
    102 
    103         return self.name
    104 }}}
    105 
    106 The SQL being generated by Django is correct:
    107 
    108 {{{
    109 #!python
    110 >>> Item.objects.dates('created', 'day').extra(select={'a': 1}).query.as_sql()
    111 ('SELECT DISTINCT (1) AS "a", django_date_trunc("day", "sqlite3_dates_item"."created") FROM "sqlite3_dates_item" ORDER BY 1 ASC', ())
    112 }}}
    113 
    114 Problem seems to be related to some bug in the version of pysqlite2 or sqlite3 (main suspect) included with the official Python 2.5.2 win32 installer (2.3.2 and 3.3.4 respectively):
    115 
    116 {{{
    117 #!python
    118 Python 2.5.2 (r252:60911, Feb 21 2008, 13:11:45) [MSC v.1310 32 bit (Intel)] on win32
    119 Type "help", "copyright", "credits" or "license" for more information.
    120 >>> from sqlite3 import dbapi2
    121 >>> print dbapi2.version_info
    122 (2, 3, 2)
    123 >>> print dbapi2.sqlite_version_info
    124 (3, 3, 4)
    125 }}}
    126 
    127 The win32 installer for Python 2.5 ships the same combination of pysqlite/sqlite versions and exhibits the same problem. The tests were also run under some other Windows- and Linux-based scenarios.
    128 
    129 Summarizing:
    130 
    131 || '''Platform''' || '''Python version''' || '''pysqlite2 version''' || '''sqlite version''' || '''works?''' || '''Notes''' ||
    132 || win32          || 2.4.4                || 2.3.0 (external)        || 3.3.6                || YES          ||             ||
    133 || Debian Linux   || 2.4.4                || 2.3.2 (external)        || 3.3.8                || YES          ||             ||
    134 || win32          || 2.5                  || 2.3.2 (built-in sqlite3)|| 3.3.4                || NO           ||             ||
    135 || Debian Linux   || 2.5                  || 2.3.2 (built-in sqlite3)|| 3.3.8                || YES          ||             ||
    136 || win32          || 2.5.2                || 2.3.2 (built-in sqlite3)|| 3.3.4                || NO           ||             ||
    137 || win32          || 2.5.2                || 2.4.1 (external)        || 3.5.2                || YES          || '''*'''     ||
    138 || Debian Linux   || 2.5.2                || 2.3.2 (built-in sqlite3)|| 3.5.9                || YES          ||             ||
    139 || custom Linux   || 2.5.2                || ?                       || 3.2.7                || NO           ||             ||
    140 
    141 Note that the tests also fail under Linux with early sqlite versions.
    142 
    143 ===== Possible solution =====
    144 
    145 As the table above shows, version <= 3.3.4 of sqlite seems to be affected by this bug whilst version >=3.3.6 isn't.
    146 
    147 We think it's a SQLite bug reported in [http://www.sqlite.org/cvstrac/tktview?tn=1768 this] ticket and fixed in [http://www.sqlite.org/cvstrac/chngview?cn=3173 this] commit six days after 3.3.5 was tagged, so it would be safe to assume that 3.3.5 is also affected. This is the complete changelog between 3.3.4 and 3.3.6: http://www.sqlite.org/cvstrac/timeline?d=115&e=2006-Jun-06&c=2&px=&s=9&dm=1&x=1
    148 
    149 As sqlite/pysqlite development continues, the pysqlite project keeps publishing new win32 binary installers for Python 2.5. Latest as of June 29, 2008 is version 2.4.1 ({{{pysqlite-2.4.1.win32-py2.5.exe}}}) that uses sqlite version 3.5.2 (see entry marked with '''*''' in the table above.)
    150 
    151 ===== How does this affect Django =====
    152 
    153 The problem doesn't lie within Django itself, but one or both of the following proposals would help users solve this problem:
    154 
    155  * Document the fact that SQLite 3.3.6 is needed. As of now Windows users using stable, supported, non-beta versions of python need to be directed to also manually apply the patch below to their copies of Django.
    156  * Invert the order being in which the sqlite3 backend tries loading the sqlite DB-API2 modules ({{{django/db/backends/sqlite3/base.py}}}) to try loading pysqlite2 first and if this fails then try loading sqlite3. Reasoning behind this is that this would allow the user to take advantage of newer pysqlite2/sqlite3 versions he/she may have installed even if using Python 2.5.x. This might be true and desirable regardless of platform:
    157 
    158 {{{
    159 #!diff
    160 --- base.py     2008-04-27 00:58:35.000000000 -0300
    161 +++ base.py-proposed    2008-06-29 20:48:29.000000000 -0300
    162 @@ -3,15 +3,16 @@
    163  
    164  Python 2.3 and 2.4 require pysqlite2 (http://pysqlite.org/).
    165  
    166 -Python 2.5 and later use the sqlite3 module in the standard library.
    167 +Python 2.5 and later use pysqlite2 or the sqlite3 module in the standard
    168 +library.
    169  """
    170  
    171  from django.db.backends import BaseDatabaseWrapper, BaseDatabaseFeatures, BaseDatabaseOperations, util
    172  try:
    173      try:
    174 -        from sqlite3 import dbapi2 as Database
    175 -    except ImportError:
    176          from pysqlite2 import dbapi2 as Database
    177 +    except ImportError:
    178 +        from sqlite3 import dbapi2 as Database
    179  except ImportError, e:
    180      import sys
    181      from django.core.exceptions import ImproperlyConfigured
    182 }}}
     9* DjangoOnWindows/TestSuiteFailures
    18310
    18411== Deployment ==
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