PetTable {
_id: ObjectId,
bdTable: string,
status: ObjectId(ref=Status)
}
Status {
_id : ObjectId,
statusCode : number, --> exple: (1, 2, ...7)
petId : ObjectId(ref=PetTable),
}
i want to find all objects of PetTable with bdTable = "zzzz" and status =5;
I have no idea how to go about it?
Run an aggregate operation with $lookup pipeline stage as follows:
db.PetTable.aggregate([
{ $match: { bdTable: 'zzzz' } },
{ $lookup: {
from: 'Status',
let: { status_id: '$status' },
pipeline: [
{ $match: {
$expr: {
$and: [
{ $eq: [ 5, '$statusCode' ] },
{ $eq: [ '$_id', '$$status_id' ] }
]
}
} }
],
as: 'status'
} },
{ $match: {
$expr: { $gt: [ { $size: '$status' }, 0] }
} },
]);