Filtering

Question 1

How do you use the url to send queries?

Answer 1

url?attr=val&atrr=val

Question 2

How do you create a hardcopy for the req.query string obj?

Answer 2

let obj = {…req.query} ;

Question 3

How would you filter certain properties form the hardcopied obj?

Answer 3

const props = [‘fields’, ‘limit’, ‘page’, ‘sort’]; props.forEach((prop) => {delete obj[prop]});

Question 4

How would you send a query for handling greater than and less than queries?

Answer 4

URL?atrr[gt/lt/lte/gte]=val

Question 5

How would you filter the query String object so less/greater than queries are handled

Answer 5

1. obj = JSON.stringify(obj).replace(/\b(gt|gte|lt|lte)\b/g, (key) => {return $${key}}); 2. obj = JSON.parse(obj);

Question 6

How would you do a database query for your final filtered object?

Answer 6

query = ModelName.find(obj);