Question

我正在尝试从多个文档中删除特定的数组项。假设我们有以下文档：

{
  _id: ...,
  email: 'person1@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleB', uuid: 'uuidB'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
},
{
  _id: ...,
  email: 'person2@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleB', uuid: 'uuidB'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
},
{
  _id: ...,
  email: 'person3@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleB', uuid: 'uuidB'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
}

然后，在给定电子邮件列表的情况下，说person1@email.com和person2@email.com从tasks匹配那些电子邮件的任何文档数组中删除，其中uuid值为{ {1}}。

结果应该是

uuidB

这是我到目前为止尝试过的：

{
  _id: ...,
  email: 'person1@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
},
{
  _id: ...,
  email: 'person2@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
},
{
  _id: ...,
  email: 'person3@email.com',
  tasks: [
     { title: 'some titleA', uuid: 'uuidA'},
     { title: 'some titleB', uuid: 'uuidB'},
     { title: 'some titleC', uuid: 'uuidC'},
  ]
}

谢谢您的帮助！

Answer 1

$elemMatch是query和projection运算符，而不是update operator。因此，您不能在这里使用它。

您需要使用“绝对”对象结构

model.updateMany(
  { "email": { "$in": emails }},
  { "$pull": { "tasks": { "uuid": uuid }}}
)

mongodb从多个文档中删除特定的数组项（nodejs）

1 个答案: