What are the different Mongoose query methods?
Each of these functions returns a Mongoose Query object.
- Model.removeMany()
- Model.deleteOne()
- Model.find()
- Model.findById()
- Model.findByIdAndDelete()
- Model.findByIdAndRemove()
- Model.findByIdAndUpdate()
- Model.findOne()
Table of Contents
What does a mongoose query return?
Mongoose allows you to structure queries using chaining or, equivalently, using POJOs in a single function call. Model. find() returns a query, which has a separate find() method that allows you to attach additional filters. The queries are not promises, but they are close enough for most practical uses.
What is a mongoose query?
The Mongoose Query class provides a chaining interface to find, update, and delete documents.
Are Mongoose methods asynchronous?
Promises Mongoose’s built-in asynchronous operations, such as . save() and queries, they return the values. This means you can do things like MyModel. You can find the return type of specific operations in the API docs. You can also read more about promises in Mongoose.
How can we save the mongoose?
Mongoose | save() function The save() function is used to save the document to the database. Using this function, new documents can be added to the database.
What is the pre method in mongoose?
pre(‘remove’), Mongoose registers the updateOne and deleteOne middleware in Query#updateOne() and Query#deleteOne() by default. This means that both doc. updateOne() and Model. updateOne() triggers updateOne hooks, but this refers to a query, not a document.
What are pre and post hooks?
Prebindings allow you to preprocess data before it is sent to the API method. You can even change the parameters that are sent or cancel the API call altogether. Post hooks allow you to manipulate the data that is returned after an API method executes.
What is this in the mongoose?
Mongoose is an object data modeling (ODM) library for MongoDB and Node. js. It manages relationships between data, provides schema validation, and is used to translate between objects in code and the representation of those objects in MongoDB.
What is the Mongoose plugin?
Plugins are a tool for reusing logic across multiple schemas. Suppose you have several models in your database and you want to add a loadedAt property to each one. Simply create a plugin once and apply it to each schema: exports = function loaded into plugin(schema, options) { schema. virtual(‘loaded into’).
What did the mongoose evolve from?
Mongooses belong to one of the four families of terrestrial cat-like mammals descended from the Viverraines, which were civet/genet-like mammals. The mongoose family is a close evolutionary relation of the Viverridae family and mongooses are sometimes classified as members of this family.
How do you remove node JS?
findByIdAndRemove({_id:body. _id},(error,newblog)=>{if(error){ console.log(error); } else{ return res.json({message:’deleted’,data:newblog}) ; } }); });
How is soft delete implemented in Mongodb?
@Override public void insert(Session session) { saveRoom(session); getTemplate(). insert(session); } @Override public void delete(Session session) { getTemplate(). delete(session); } }
Is mongoose an ORM?
Mongoose is similar to an ORM (Object-Relational Mapper) that you would use with a relational database. Mongoose is an ODM that provides a simple, schema-based solution for modeling your application’s data on top of native MongoDB drivers.
What is the latest version of Mongoose?
Below are the semver ranges that represent which versions of mongoose are compatible with the listed versions of the MongoDB server.
- MongoDB 3.4.x server: Mongoose ^4.7.3 or 5.x.
- MongoDB 3.6.x server: Mongoose 5.x.
- MongoDB 4.0.x server: mongoose ^5.2.0.
- MongoDB 4.2.x server: mongoose ^5.7.0.
- MongoDB 4.4.x server: mongoose ^5.10.0.
Why does Mongoose need a schema?
Mongoose models and their schemas allow you to perform validation on fields that you expect or are required. But if you stop there, you’ve just got the equivalent of a relational schema.
Can we use mongoose without schema?
Since it’s a schema-less type, you can change the value to anything else you want, but Mongoose loses the ability to automatically detect and save those changes.