Fixed #10121: Restored code lost in r9766 that prevented overwriting an already-set blank=True FileField with blank.  This would happen, for instance, in the admin if an object with a FileField was edited/saved but the file not re-uploaded, resulting in the association to the previously-uploaded file being lost.  Adding the ability to re-blank FileFields when they are once set is the subject of a different ticket (#7048), for now the pre-9766 behavior here has just been restored in order to avoid unexpected data loss.  Thanks to Alex for help in understanding how to fix this without un-doing the intent of r9766.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9840 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10248 -- Corrected handling of the GROUP BY clause when using a DateQuerySet. Thanks to Alex Gaynor for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9839 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10132 -- Corrected the interaction of extra() queries with the values() clause. Thanks to Glen Maynard for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9838 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10256 -- Corrected the interaction of extra(select=) with values() and values_list() where an explicit list of columns is requested.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9837 bcc190cf-cafb-0310-a4f2-bffc1f526a37

  * Added to documentation of missing characters from `allowed_chars` in `make_random_password`.
  * Fixed several long lines and word wraps.
  * Added a reference link to the "How to log a user in" section and made a later reference to this section an actual link using the `:ref:` directive.
  * Turned a command line code example into a code block.
  * Added attribute reference link for a ``request.META`` mention.
  * Added `code-block:: html` directives for HTML examples.
  * Corrected reference links for all the `auth.views` functions.
  * Added a few function signatures and documentation of optional parameters that were missing for some of the the `auth.views` functions (refs #10272).


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9835 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@9827 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10240 -- Restored YAML serialization with Decimal objects that broke with r9823. Thanks Alex Gaynor for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9825 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #5903 -- DecimalField.get_default() now correctly returns a Decimal object when the model instance was not retrieved from the database. Thanks Justin Driscoll and pigletto.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9823 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9821 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10160 -- Modified evaluation of F() expressions to protect against potential SQL injection attacks. Thanks to Ian Kelly for the suggestion and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9820 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10199 -- Modified aggregate() calls to clone the base query so that the base query can be reused. Thanks to Alex Gaynor for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9819 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #7672 -- Added a 'week_day' lookup type. Many thanks to Ross Poulton for the proposal and implementation on all built-in database backends..


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9818 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@9816 bcc190cf-cafb-0310-a4f2-bffc1f526a37

This commit also decomposes the decorator into two decorators which can be
used separately, adds some tests, updates docs and fixes some code comments.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@9815 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10187 -- Added documentation on how to import F() objects. Thanks to trigeek38 for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9814 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@9809 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10127 -- Corrected (no, really, this time!) the way the select_related() cache is populated when annotations are also contained in the query. Thanks to Sylvain Pasche <sylvain.pasche@gmail.com> for the report and test case.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9808 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9806 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10127 -- Corrected handling of select_related() in annotate() calls. Thanks to Sylvain Pasche <sylvain.pasche@gmail.com> for the report and test case.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9805 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10142 -- Added docs and an exploding error message to highlight an error present in the implementation of STDDEV_POP and VAR_POP in PostgreSQL 8.2-8.2.4 that will give incorrect answers (the database function mistakenly returns sample, rather than population deviation/variance). Thanks to Vinay Sajip <vinay_sajip@yahoo.co.uk> for the report, and Ian Kelly for pointing out the cause of the problem.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9804 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #9858 -- Added ability to use PostGIS template with GIS test runner via `POSTGIS_TEMPLATE` setting.  Thanks to Aryeh Leib Taurog for feature suggestion and initial patch.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9803 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Now use `subprocess.Popen` instead of the deprecated os.popen3 to issue PostGIS test database creation commands.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9801 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9800 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9799 bcc190cf-cafb-0310-a4f2-bffc1f526a37

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9795 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #8638 -- Added documentation on how to redirect email to a dummy server for testing purposes. Thanks to Rob Hudson and Marc Fargas for their work on the draft for this change.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9793 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Many thanks to:
    * Nicolas Lara, who worked on this feature during the 2008 Google Summer of Code.
    * Alex Gaynor for his help debugging and fixing a number of issues.
    * Malcolm Tredinnick for his invaluable review notes.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9792 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Refs #10113 -- Modified the generated SQL to remove redundant GROUP BY elements, and modified the test added in [9788] to remove a test result that depended on a potentially ambiguous database ordering.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9791 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10110 -- Added FAQ on how and when to poke the core developers about tickets. Thanks to Graham King for turning a couple of django-dev posts into a good first draft.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9789 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10113 -- Ensured that joined fields mentioned in order_by() are included in the GROUP_BY clause on those backends that require it. Thanks to Koen Biermans <koen.biermans@werk.belgie.be> for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9788 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10052 -- Added import line for other aggregates used in examples. Thanks to Tyler Brownell <tyler@bluefoxstudio.ca> for the suggestion.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9787 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10089 -- Corrected handling of aggregates when the query set contains no items (and the cursor returns None). Thanks to Kyle Fox for the report, and david for the initial patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9786 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Fixed #10100 -- Corrected handling of the negation required exclude() clauses that reference aggregate columns. Thanks to Anossov for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9785 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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Fixed #10064 -- Corrected handling of aggregate queries that also use select_related(). Thanks to olivius for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9781 bcc190cf-cafb-0310-a4f2-bffc1f526a37