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Chayti Saha
Chayti Saha

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Let's know about Mongoose

Mongoose:
MongoDB is a nosql, document oriented database program. It stores JSON-like documents with optional schema. But, Mongoose is an Object Data Modelling (ODM) for mongodb and nodejs. It manages relationships between data. It defines a schema for collections.

MongoDB VS Mongoose:

  1. DBMS VS Object Document Mapper
  2. Stores data VS Manages relationship between data
  3. Supports multiple languages VS Only mondoDB
  4. Aim - Storing collection in DB VS Defining schema for collections.

Mongoose defines schema and also validates it. It helps to structure the document for better presentation. It enables users to add/ edit properties easily.

To use this, at first we have to install mongoose, like,

npm install mongoose --save
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Once we define a schema, we can create a Model based on a specific schema in Mongoose. After creation of the model, a Mongoose Model is then mapped to a MongoDB Document and it is done via the Model's schema definition.

The permitted schema types are:

  1. Array
  2. Boolean
  3. Buffer
  4. Date
  5. Mixed (A generic / flexible data type)
  6. Number
  7. ObjectId
  8. String

We can create a mongoose model by following 3 steps as:

1. Referencing mongoose:

let mongoose = require('mongoose')
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2. Defining the schema

let newSchema = new mongoose.Schema({
  variable_name: variable_type
})
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3. Exporting a model

module.exports = mongoose.model(collection_name, schema_name)
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Basic operations of Mongoose are:

  1. Create record
  2. Fetch record
  3. Update record
  4. Delete record

References:

  1. Introduction to mongoose for mongodb
  2. Mongoose crash course
  3. Reasons to use mongoose
  4. Mongoose tutorial playlist for beginner

Mongoose documentation can be followed for detailed implementation.

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