检查mongoDb集合中是否存在特定字段，但不包括一条记录

Question

I have collection, as shown below

  { 
        "_id" : ObjectId("58fe3768f997ca09d551c34e"), 
        "firstName" : "arbar", 
        "lastName" : "ame", 
        "email" : "test41@gmail.com", 
        "phone" : "9966589965", 
        "password" : "$2a$10$pgRWb8Db385A5BbicEDJ2erHuUQsAIVmjqVuccXj7x.1iptdY/z7a", 
        "team_id" : ObjectId("58ef6d0a11c37915acaf7c9b"), 
        "activated" : false, 
        "accessLevel" : NumberInt(6)
    }
    { 
        "_id" : ObjectId("58fe37c2f997ca09d551c350"), 
        "firstName" : "Abrar Ahmed", 
        "lastName" : "asdf", 
        "email" : "test42@gmail.com", 
        "phone" : "9966158845", 
        "password" : "$2a$10$y3hPjuHeq0HVyukTnGCRT.k5xfSUH0z/mdGR8n7Gu09f7A7Z20bV6", 
        "team_id" : ObjectId("58ef6d0a11c37915acaf7c9b"), 
        "activated" : false, 
        "accessLevel" : NumberInt(6)
}
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I am trying to check if email test41@gmail.com exists in this collection, if I use this.collection.findOne({ email: 'test41@gmail.com' }); will look for all the records in a collection but how would I exclude one record in a collection by using _id field as reference to exclude.

Here the email is exists in one record of the collection with "_id" : ObjectId("58fe3768f997ca09d551c34e"), , but I want to exclude this record and search in rest of the records in a Collection.

Answer 1

Don't use findOne , use find to find all occurrences. Now if you want to exclude some document you can do by following

db.collection.find({$and: [{"email": "test41@gmail.com"}}, {"_id": {$ne: ObjectId("58fe3768f997ca09d551c34e")}}]})