I have a model that looks like this:
mongoose.Schema({
username: String,
posts: [{ type: Schema.Types.ObjectId, ref: 'Post' }]
});
I have an endpoint that I want to pass an ObjectID:
app.delete('/post', function(req, res) {
User.findOne({ _id: req.user._id}, function(err, result) {
result.pull({ _id: req.body.post_id });
});
});
Feels like it should work, but I'm getting this error:
CastError: Cast to ObjectId failed for value "[object Object]"
What am I doing wrong?
If you want remove one element from an array use this
User
.update(
{_id: req.user._id},
{ $pull: {posts: req.body.post_id } }
)
.then( err => {
...
});
Here the documentation
This is because when you are running user findOne query it returns an object to you.(the findOne function returns only one object)
User.findOne({ _id: req.user._id}, function(err, result) {
/// result is an object
result.pull({ _id: req.body.post_id });
});
and what is result.pull you are trying to pull an element from object this is the wrong way to do
do like this
delete result._id;
and if you want more elements from user query in from of array you can use
User.find({ _id: req.user._id}, function(err, result) {
// result.slice for slice you can see this http://stackoverflow.com/questions/3396088/how-do-i-remove-an-object-from-an-array-with-javascript
});
then you can do slice on array of object
In order to make a research with an id in a collection you need to create a new ObjectId and then pass the id into it.
app.delete('/post', function(req, res) {
User.findOne({ _id: _id: ObjectId (req.user._id)}, function(err, result) {
result.pull({ _id: ObjectId (req.body.post_id) });
});
});
