Question

我试图按创建日期过滤对象并按季度对其进行排序。

我有一个这样的样本模型

psycopg2.OperationalError: server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.

然后我有另一个以这种方式与Assets模型关联的模型，

db = pg.connect(
    dbname=config.db_name,
    user=config.db_user,
    password=config.db_password,
    host=config.db_host,
    port=config.db_port
)
with db.cursor() as c:
    c.execute("""
        CREATE EXTENSION IF NOT EXISTS postgres_fdw;
        CREATE SERVER fdw FOREIGN DATA WRAPPER postgres_fdw OPTIONS (...);
        CREATE USER MAPPING FOR CURRENT_USER SERVER fdw OPTIONS (...);
        CREATE SCHEMA foreign;
        IMPORT FOREIGN SCHEMA foreign_schema FROM SERVER fdw INTO foreign;
    """)
    c.execute("""
        CREATE MATERIALIZED VIEW IF NOT EXISTS my_view AS (
            SELECT (...)
            FROM foreign.foreign_table
        );
    """)

我收到此错误

class Asset(models.Model): created_at = models.DateTimeField(auto_now_add=True)

我遵循了此处的示例，并查找了类似的问题，但没有一个解决我的问题 https://docs.djangoproject.com/en/2.2/ref/models/querysets/#quarter

Answer 1

您使用Django 1.11，但quarter仅在2.0中出现：

https://docs.djangoproject.com/en/2.2/releases/2.0/#models

因此，至少要使用Django v2.0

，请使用quarter

Answer 2

它不是与quarter一起出现，而是与您尝试执行的联接一起出现。

   def assets_total_quarterly(self):
        q1= self.objects.filter(assets__created_at__quarter=1)
        return q1

django.core.exceptions.FieldError：DateTimeField不支持的查找“季度”或不允许在字段上加入

2 个答案: