arangodb AQL查询以删除列表及其子项，具体取决于条件

问题描述

我有一组包含日志列表的帐户

如果日志的“ loggedAt”字段早于5天，则我需要删除帐户的“日志”列表中的每个日志，而不会留下孤立的日志或破坏“日志”列表的引用。

如何使用AQL或arangosh命令实现这一目标？

类似这样的东西

nf.loc[:,'priorBDay'] = np.busday_offset(nf.curr_date.values.astype('M8[M]') + np.timedelta64(-1,'M'),-1,roll='forward')

帐户凭证示例

datetime64[ns,UTC]

Account.class

FOR a IN account
 FOR l IN log

FILTER l._id IN a.logs
FILTER DATE_DIFF(l.loggedAt,DATE_Now(),'days',false) > 5

UPDATE a WITH { logs: REMOVE_VALUE( a.logs,l ) } IN account
REMOVE { _key: l._key } IN log

日志文档示例

_id:account/1085466856
_rev:_bIYHFNu---
_key:1085466856
{
  "_class": "com.app.Account","logs": [
    "log/1085468455","log/1085468456","log/1085468457"
  ]
}

Log.class

@Data
@Document("account")
public class Account implements Serializable {

    private static final long serialVersionUID = -1615384653229054932L;

    @Id
    private String id;

    @Ref(lazy = false)
    private Collection<Log> logs;
}

解决方法

您可以通过2个AQL查询来做到这一点：

先删除日志：

LET fiveDaysAgo = DATE_SUBTRACT(DATE_NOW(),5,'days')
FOR rec IN log
  FILTER DATE_DIFF(rec.loggedAt,fiveDaysAgo,'days') >= 0
  REMOVE rec IN log

下一步清理帐户：

FOR acc IN account
  LET validLogs = (
    FOR accLog IN acc.logs
      FOR rec IN log
        FILTER accLog == rec._id
        RETURN rec._id
  )
  FILTER LENGTH(acc.logs) != LENGTH(validLogs)
  UPDATE acc WITH {logs: validLogs} IN account

如果需要，可以将以上查询合并为一个查询：

LET fiveDaysAgo = DATE_SUBTRACT(DATE_NOW(),'days')
FOR acc IN account
  LET invalidLogs = (
    FOR accLog IN acc.logs
      FOR rec IN log
        FILTER accLog == rec._id
        FILTER DATE_DIFF(rec.loggedAt,'days') >= 0
        REMOVE rec IN log
        RETURN OLD._id
  )
  FILTER LENGTH(invalidLogs) > 0
  UPDATE acc WITH {logs: OUTERSECTION(acc.logs,invalidLogs)} IN account

但是，如果您在log集合中有僵尸记录（与account记录没有任何关联的记录），上面的查询将使它们保持不变。

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