freeCodeCamp Challenge Guide: Chain Search Query Helpers to Narrow Search Results

Guide
1

Chain Search Query Helpers to Narrow Search Results

Hints

Hint 1

To create but not execute a find query

Model.find({ name: "Leah" });

Hint 2

To store the find query into a variable for later use:

var findQuery = YourModel.find({ name: "Leah" });

Hint 3

To sort an array:

yourArray.sort({ age: 1 }); // Here: 1 for ascending	order and -1 for descending order.

Hint 4

To limit an array’s size:

yourArray.limit(5); // return array which has 5 items in it.

Hint 5

To hide certain property from the result:

yourArray.select({ name: 0, age: 1 }); // Here: 0 means false and thus hide name property; 1 means true so age property will show.

Hint 6

To execute this query, you can either:

  1. Callback:
YourQuery.exec(function(err, docs) {
  //do something here
});

Hint 7

Or

  1. Promise
YourQuery.exec.then(function(err, docs) {
  //do something here
});

Hint 8

Chain it all together:

Person.find({ age: 55 })
  .sort({ name: -1 })
  .limit(5)
  .select({ favoriteFoods: 0 })
  .exec(function(error, people) {
    //do something here
  });
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