MongoDB

Question 1

In MongoDB, how do you create a collection and add an item to that collection at the same time?

Answer 1

db.db_name.insertOne( {“test”: “test”} )

Question 2

In MongoDB, how do you switch between DBs?

Answer 2

use db_name

Question 3

In MongoDB, how do you delete a collection?

Answer 3

db.db_name.drop()

Question 4

What is the difference between the native MongoDB driver for node and Mongoose?

Answer 4

mongoose holds the schemas within the application code, whereas the mongodb driver relies on the schemas set within the database

Question 5

What is the syntax for creating a Mongoose item Schema?

Answer 5

const ItemSchema = new Schema({
    field_name: field_type,
    required: true
})

Question 6

In Mongoose, how do you create a model?

Answer 6

Define the structure of the model and then export it to be received by other local files using:

module.exports = Item = mongoose.model(‘model_name’, ModelSchema)

Question 7

In Mongoose, what is the syntax for posting a new item to MongoDB?

Answer 7

router.post('/path/to/api', (req, res) => {
    const newItem = new Item({
        name: req.body.name
    });

newItem.save()
    .then(item => res.json(item)
    .catch(err => res.json({ message: err }); });

Question 8

In Mongoose, what is the syntax for deleting an item from MongoDB?

Answer 8

router.delete(‘/path/to/api/:id’, (req, res) => {
const itemId = req.params.id;
Item.findById(itemId)
.then(item =>
item
.remove()
.then(() => res.json({ message: itemId }))
.catch(err =>
res.status(404).json({ message: err }));
});