如何建立mongoDB查询以在文档字段中找到任何myArray id？

Question

I have on a mongoDB, a collection with the following schema:

const ReceiptSchema = new Schema(
  {
    status: String,
    active: Boolean,
    name: String,
    companies: [Schema.Types.ObjectId],
    total: Number
  },
  { toJSON: { virtuals: true }, toObject: { virtuals: true } }
)

And I have on my script the following ids Array:

myArray = ['abc', 'def', 'ghi']

How can I build a query to get all the documents fro Receipt schema that contains some of the ids on my array, inside the field companies ?

Any idea? Thanks

Answer 1

You can use $setIntersection to find any matching array element in companies array

on mongo 3.6+

find

db.recip.find({$expr : {$gt : [{$size : {$setIntersection : ["$companies", ['abc']]}}, 0] }})

aggregate

db.recip.aggregate(
    [
        {$match : {$expr : {$gt : [{$size : {$setIntersection : ["$companies", ['abc']]}}, 0] }}}
    ]
)

on mongo 3.4

db.recip.aggregate(
    [
        {$addFields : {isMatches : {$gt : [{$size : {$setIntersection : ["$companies", ['abc']]}}, 0] }}},
        {$match : {isMatches : true}}
    ]
)

change $addFields to $project in mongo version less than 3.4