我有两个mongo集合,一个包含约会提醒,另一个包含通知。我正在尝试返回所有存档的结果:给定branchId / climate_id中的虚假提醒,并包括其已确认:虚假通知。另外,无论是否有通知,我都希望确保约会显示在结果中。
我需要通过branchId aka clinic_id“加入”集合,然后为每个结果约会提醒创建一个未确认通知的数组。
我返回正确的约会,但notif数组未通过匹配PatientId / Patient_id进行过滤。每个提醒似乎都包含完全相同的notif数组。除此之外,其他一切似乎都是正确的。因此,我的问题是如何确保notif数组仅包含与提醒的Patient_id值匹配的PatientId?
截断的约会提醒架构:
{
time: {
type: Date,
required: true
},
patient_id: {
type: String,
required: true
},
status: {
type: String,
default: 'unconfirmed'
},
archive: {
type: Boolean,
default: false
},
branch: [
// Incorrectly setup as an array rather than an object.
// Can $unwind as there is only ever one item in the array
{
name: {
type: String,
required: true
},
clinic_id: { // aka branchId
type: String,
required: true
}
}
]
}
通知架构:
{
branchId: { type: String, required: true }, // aka clinic_id
patientId: { type: String, required: true },
acknowledged: { type: Boolean, default: false },
date: { type: Date, default: Date.now }
}
汇总查询:
[
{ $match: { 'branch.0.clinic_id': '1', archive: false } },
{ $unwind: '$branch' },
{
$lookup: {
from: 'notifications',
let: { clinic_id: '1', patient_id: '$patientId' }, //<-- issue with patient_id?
pipeline: [
{
$match: {
$expr: {
$and: [
{ $eq: ["$patientId", "$$patientId"] }, <-- errors $$patientId unknown value. $$patient_id returns 0 results.
{ $eq: ['$branchId', '$$clinic_id'] },
{ $eq: ['$acknowledged', false] }
]
}
}
}
],
as: 'notif'
}
}
]
示例输出,其中包含有关我期望的输出和不正确输出的注释:
{
patient_id: '1',
time: '2019-05-29T11:00:00.000Z',
status: 'unconfirmed',
archive: false,
branch: [
{
name: 'Example location',
clinic_id: '100',
}
],
notif: [
{
// This is correct
branchId: '100', // branchId matches clinic_id
patientId: '1', // patientId matches contacts patient_id
acknowledged: false, // notification is unacknowledged
date: '2019-05-18T16:18:05.480Z'
},
{
// This is not correct
branchId: '100',
patientId: '2', // PatientId does not match patient_id of reminder
acknowledged: false,
date: '2019-05-20T16:18:05.480Z'
}
]
}
借助tom slabbaert,此问题得以解决:
[
{ $match: { 'branch.clinic_id': '1', archive: false } },
{ $unwind: '$branch' },
{
$lookup: {
from: 'notifications',
let: { clinic_id: '1', patient_id: '$patient_id' }, // <-- changed here
pipeline: [
{
$match: {
$expr: {
$and: [
{ $eq: ["$$patient_id", "$patientId"]}, // <-- changed here
{ $eq: ['$branchId', '$$clinic_id'] },
{ $eq: ['$acknowledged', false] }
]
}
}
}
],
as: 'notif'
}
}
]
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