Question

我有一个表，其中有一列存储值列表。这些值基本上是另一个表的外键值。

表格是：

groups (
  id               TEXT PRIMARY KEY,
  users            TEXT [],
  name             TEXT NOT NULL,
  user_count       INT  NOT NULL,
  group_type       TEXT NOT NULL CHECK (group_type IN ('random', 'friends')) DEFAULT 'random',
  validity_period  INT  NOT NULL,
  user_add_time    INT  NOT NULL,
  winner           TEXT [],
  energy_drink_fee INT                                                       DEFAULT 0,
  energy_bar_fee   INT                                                       DEFAULT 0,
  winnings         INT                                                       DEFAULT 0, -- can be 0 (for free tournaments), 40, 150 (for paid tournaments)
  created_at       TIMESTAMP                                                 DEFAULT now(),
  updated_at       TIMESTAMP                                                 DEFAULT now()
);

在Django中，它是：

class Groups(models.Model):
    id = models.TextField(primary_key=True)
    users = ArrayField(blank=True, null=True, base_field=models.CharField)
    name = models.TextField()
    user_count = models.IntegerField()
    group_type = models.TextField()
    validity_period = models.IntegerField()
    user_add_time = models.IntegerField()
    winner = ArrayField(blank=True, null=True, base_field=models.CharField)
    energy_drink_fee = models.IntegerField(blank=True, null=True)
    energy_bar_fee = models.IntegerField(blank=True, null=True)
    winnings = models.IntegerField(blank=True, null=True)
    created_at = models.DateTimeField(blank=True, null=True)
    updated_at = models.DateTimeField(blank=True, null=True)

'users'和'winners'是存储User表的id的列（username是id）。

我没有更改数据库，表格是相同的，除了我使用Django读取此数据库（Legacy DBs）。我仍然不确定ArrayField。

这是我在SQL中编写的查询：

SELECT COUNT(g.*) AS match_count, TEXT(g.created_at::DATE) AS created_at
FROM groups g
JOIN users u ON u.username = ANY (g.winner)
WHERE g.created_at::DATE >= '2018-01-01' AND g.created_at::DATE <= '2018-01-20'
      AND g.winnings = 0 AND g.group_type = 'random' AND u.type = 'u'
      AND g.winner IS NOT NULL
GROUP BY g.created_at::DATE

我需要将此查询迁移到Django的ORM中。如何使用此数组字段（获胜者）进行连接？

Django ORM：外键值列表

0 个答案: