$and$not$nor

Operators: $not

Performing logical negation on a query expression.

🪶 The $not operator is used to perform logical negation on a query expression.


Database: Client > model: Users

Here we will simulate a database with the Users collection:
1
  • COLLECTION:
    • Users > [
    2  
  • {
  • name:
    • "Chris Axxwell",
  • nick:
    • "Chris",
  • age:
  • 27
  • }
    • ,
    3  
  • {
  • name:
    • "Chris Buckman",
  • nick:
    • "Chris",
  • age:
  • 28
  • }
    • ,
    4  
  • {
  • name:
    • "Santiago Smith",
  • nick:
    • "Lollipop",
  • age:
  • 24
  • }
    • ,
    5  
  • {
  • name:
    • "Justin Dacker",
  • nick:
    • "Justin",
  • age:
  • 22
  • }
    • ,
    6  
  • {
  • name:
    • "Chris Morgan",
  • nick:
    • "Mor",
  • age:
  • 25
  • }
    • ,
    7   ...
    8]

    Query the above database:

    1
  • import
    • MerlinDB,
  • {
    • Schema
  • }
  • from
    • "@chrisaxxwell/merlin-db";
    2
  • //Or if you are using 'merlindb.max.js' just call 'new MerlinDB()';
    • 3
    4
  • const
    • merlin =
  • new
  • MerlinDB(
  • )
    • ;
    5merlin
  • .connect(
    • "Client"
  • )
    • ;
    6
  • var
    • clientModel = merlin
  • .model(
    • "Users", <userSchema>
  • )
    • ;
    7
    8
  • //$not: <value>;
    • 9clientModel
  • .find(
  • {
    • 10
    11  
  • name:
  • {
  • $not:
  • {
  • $eq:
    • "Chris Axxwell"
  • }
  • }
    • 12  
  • //Name is not the same as Chris Axxxell
    • 13
  • }
  • )
  • .then(
    • e =>
  • {
    • 14   console
  • .log(
    • e
  • )
    • ;
    15  
  • //returns:
    • 16   [  
    17      
  • {
  • name:
    • "Chris Buckman",
  • nick:
    • "Chris",
  • age:
  • 28
  • }
    • ,
    18      
  • {
  • name:
    • "Santiago Smith",
  • nick:
    • "Lollipop",
  • age:
  • 24
  • }
    • ,
    19      
  • {
  • name:
    • "Justin Dacker",
  • nick:
    • "Justin",
  • age:
  • 22
  • }
    • ,
    20      
  • {
  • name:
    • "Chris Morgan",
  • nick:
    • "Mor",
  • age:
  • 25
  • }
    • ,
    21      ...
    22   ]
    23
  • }
  • )
    • $and$not$nor