如何使用 Lucid Query builder 获取相关模型结果的总和

Question

我正在使用 AdonisJs，我正在尝试获取所有项目及其任务的估计时间总和。

我的代码是这样的

const entities = await Project.query()
  .with('task', (builder) => {
    builder.select('project_id')
    builder.sum('estimate as estimateTime')
    builder.groupBy('project_id')
  })
  .where({ account_id: accountId })
  .fetch()

我希望查询看起来像这样： SELECT "project_id", SUM("estimate") AS "estimateTime" FROM "project_tasks" WHERE "project_id" IN (5,6,1,2) GROUP BY "project_id"

但实际查询是： SELECT "project_id", SUM("estimate") AS "estimateTime" FROM "project_tasks" WHERE "project_id" = 5 AND "project_id" IN (5,6 ,1,2) 分组 "project_id"

当我在查询中添加 builder.sum('estimate as estimateTime') 时，它似乎添加了这个附加子句 "project_id" = 5。

我知道我可以自己构建这个查询，但我想利用项目模型的其他关系。

有什么办法可以解决这个问题吗？

Answer 1

为了获得相关的总和，您需要数据库助手。所以你的查询应该是这样的：

const entities = await Project.query()
  .with('task', (builder) => {
    builder.select(Database.raw('sum(estimate) as estimate'))
    .select('project_id')
    .groupBy('project_id')
  })
  .where({ account_id: accountId })
  .fetch()

如何使用 Lucid Query builder 获取相关模型结果的总和

How to get the sum of related model results using Lucid Query builder

sum

relationship

node.js

adonis.js

lucid