I am new to backend dev. I am trying to check if there is already an existing user in the collection and console log 'no' if there is none. I do not have the indicated data in 'const b' but instead of 'no' I keep getting empty array in terminal.
const b = {email: "[email protected]", password: "wwww"}
MyModel.find(b)
.then(exUs =>{
if(exUs){
console.log(exUs)
} else {
console.log("no")
}
})
find always returns an cursor(which can be empty [] if no docs) ,so your if condition will always true ,and if there are zero docs it will print empty array [] (returns cursor never null).
const b = {email: "[email protected]", password: "wwww"}
MyModel.find(b)
.then(exUs =>{
if(exUs){ // this always returns true even if there are no docs as empty array[]
console.log(exUs)
} else {
console.log("no")
}
})
What you should do rather ?
This
const b = {email: "[email protected]", password: "wwww"}
MyModel.find(b)
.then(exUs =>{
if(exUs.length>0){
console.log(exUs)
} else {
console.log("no")
}
})
Or You can use findOne,it will return null if no doc is found and the very first doc if exists ,so your code will become
const b = {email: "[email protected]", password: "wwww"}
MyModel.findOne(b)
.then(exUs =>{
if(exUs){// checks for null here now
console.log(exUs)
} else {
console.log("no")
}
})
