django1.8中不支持month__gte

因为需要再数据库里查找指定大于某个月的记录，发现可以使用model中month__gte，很方便，可惜djanogo1.9中才有，做个记录。

Entry.objects.filter(pub_date__month__gte=6)

改成下面的代码之后发现因为自己的是django1.8，报错无此方式，查文档发现该方式是django1.9中才新增的

year = 2012
month = 09
Departure_Date.objects.filter(date_from__year__gte=year,
                              date_from__month__gte=month,
                              date_to__year__lte=year,
                              date_to__month__lte=month)

• 1.8文档

# month¶

#  For date and datetime fields, an exact month match. Takes an integer 1 (January) through 12 (December).

Entry.objects.filter(pub_date__month=12)

• 1.9文档

#  For date and datetime fields, an exact month match. Allows chaining additional field lookups. Takes an integer 1 (January) through 12 (December).

Entry.objects.filter(pub_date__month=12)
Entry.objects.filter(pub_date__month__gte=6)

# 相当于如下SQL
SQL equivalent:

SELECT ... WHERE EXTRACT('month' FROM pub_date) = '12';
SELECT ... WHERE EXTRACT('month' FROM pub_date) >= '6';