I am having trouble with mongoosejs, I think. I am trying to keep an array of objects at a specific size of 2. When this function is called it adds an item to the array and slims it down if necessary. However when I save the array the size is not trimmed down to 2. Follow the code and comments. Thanks for any help you can provide.
user.location.push(req.body); //Add a new object to the array.
if(user.location.length > 2) //If the array is larger than 2
user.location.splice(0,1); //Remove the first item
console.log(user.location); //This outputs exactly what I would expect.
user.save(function(err, updatedUser){
if(err)
next(new Error('Could not save the updated user.'));
else {
res.send(updatedUser); //This outputs the array as if it was never spliced with a size greater than 2.
}
});
Because you're defining location: [] in your schema, Mongoose treats that field as Mixed which means you have to notify Mongoose when you've changed it. See the docs here.
Change your code that updates user.location to be:
if(user.location.length > 2) {
user.location.splice(0,1);
user.markModified('location');
}