我想先按日期排序模型,然后按分数排序,这意味着我希望每天都能看到最高得分的文章。Django按日期排序(日)
class Article(models.Model):
date_modified = models.DateTimeField(blank=True, null=True)
score = models.DecimalField(max_digits=5, decimal_places=3, blank=True, null=True)
这个答案Django Datetime Field Query - Order by Time/Hour建议我使用'__day'
我date_modified
为:
Article.objects.filter().order_by('-date_modified__day', '-score')
FieldError: Cannot resolve keyword 'day' into field. Join on 'date_modified' not permitted.
但是我得到相同的错误在后,所以我甚至不能确定它应该工作的这个办法。
我发现其他答案django order by date in datetime/extract date from datetime使用.extra
:
Article.objects.filter().extra(select={"day_mod": "strftime('%d', date_modified)"}, order_by=['-day_mod', '-score'])
这适用于没有其他条件过滤,但如果我在过滤器上应用的条件,如类别:
Article.objects.filter(category = 'Art').extra(select={'day_mod': "strftime('%d', date_modified)"}, order_by=['-day_mod', '-score'])
我得到这个错误:
File "/home/mykolas/anaconda2/lib/python2.7/site-packages/IPython/core/formatters.py", line 699, in __call__
printer.pretty(obj)
File "/home/mykolas/anaconda2/lib/python2.7/site-packages/IPython/lib/pretty.py", line 383, in pretty
return _default_pprint(obj, self, cycle)
File "/home/mykolas/anaconda2/lib/python2.7/site-packages/IPython/lib/pretty.py", line 503, in _default_pprint
_repr_pprint(obj, p, cycle)
File "/home/mykolas/anaconda2/lib/python2.7/site-packages/IPython/lib/pretty.py", line 694, in _repr_pprint
output = repr(obj)
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/models/query.py", line 234, in __repr__
data = list(self[:REPR_OUTPUT_SIZE + 1])
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/models/query.py", line 258, in __iter__
self._fetch_all()
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/models/query.py", line 1074, in _fetch_all
self._result_cache = list(self.iterator())
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/models/query.py", line 52, in __iter__
results = compiler.execute_sql()
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 848, in execute_sql
cursor.execute(sql, params)
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/backends/utils.py", line 83, in execute
sql = self.db.ops.last_executed_query(self.cursor, sql, params)
File "/home/mykolas/lenv/lib/python2.7/site-packages/django/db/backends/sqlite3/operations.py", line 146, in last_executed_query
return sql % params
TypeError: %d format: a number is required, not unicode
不太了解wha吨的发生在这里,帮助将不胜感激。
谢谢按预期工作。完美的时机为Django 1.10 :) – Xlrv