我尝试进行 django 查询以按 VOTES - POST AGE 获取帖子顺序。
示例:
普通帖子
1 - Hello World (10 votes) (Posted today)
2 - Stackoverflow ( 12 votes) (Posted 2 days ago)
3 - StackExchange ( 30 votes ) (Posted 19 days ago)
所以当我通过注释过滤查询时,我想要这个:
1 - StackExchange ( 30 votes - 19 days ago = 11 points)
2 - Hello World ( 10 votes - 0 days ago = 10 points)
3 - Stackoverflow ( 12 votes - 2 days ago = 10 points)
我尝试:
class DiffDays(Func):
function = 'DATEDIFF'
template = "%(function)s(%(expressions)s)"
class CastDate(Func):
function = 'DATE_FORMAT'
template = "%(function)s(%(expressions)s, '%%%%Y-%%%%m-%%%%d')"
list_posts = posts.extra(
select={'pub_date': "DATE_FORMAT(pub_date,'%%%%Y-%%%%m-%%%%d')"}
).annotate(
diff_days=DiffDays(
CastDate(today), F('pub_date')), output_field = DecimalField()
).annotate(
days_votes=ExpressionWrapper(
F('n_votes') - F('diff_days'), output_field=IntegerField())
).order_by('days_votes')
但我得到:'IntegerField'对象没有属性'resolve_expression'
最佳答案
现在 diff_days
注释中的 output_field
是注释的参数,但它必须是 DiffDays
的参数,所以你需要添加括号将其放入 func DiffDays
today = today.strftime('%Y-%m-%d')
annotate(
diff_days=DiffDays(
(today, F('pub_date')), output_field=DecimalField())
#^^^ ^^^
)
关于mysql - Django 搜索查询与 Annotate 比较投票和帖子年龄,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46206540/