"MongoDB查询多个特定文档"

Question

I would like to make a single query to my backend database to retrieve a list of results. These results will have a unique "product_id" and they will also have a "variant_id". Items may share product IDs but must have unique variant IDs. For Example

{
  product_id:"123",
  variant_id:"000"
}

{
  product_id:"123",
  variant_id:"111"
}

{
  product_id:"987",
  variant_id:"000"
}

Answer 1

Simple $or can do the job:

db.collection.find({
$or: [
 {
  "product_id": "123",
  "variant_id": "000"
 },
 {
  "product_id": "987",
  "variant_id": "000"
 }
]
})