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mongoose

Mongoose MongoDB ODM


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2.6M
increased by0.46%
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4
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What is 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 are mongoose's main functionalities?

Schema Definition

Defines a schema for a collection with various field types, validation, and defaults.

{"const mongoose = require('mongoose');\nconst Schema = mongoose.Schema;\nconst blogSchema = new Schema({\n  title: String,\n  author: String,\n  body: String,\n  comments: [{ body: String, date: Date }],\n  date: { type: Date, default: Date.now },\n  hidden: Boolean,\n  meta: {\n    votes: Number,\n    favs: Number\n  }\n});"}

Model Creation

Creates a model based on a defined schema, which can then be used to create, read, update, and delete documents of that schema type.

{"const mongoose = require('mongoose');\nconst Blog = mongoose.model('Blog', blogSchema);"}

Connection to MongoDB

Establishes a connection to a MongoDB database.

{"const mongoose = require('mongoose');\nmongoose.connect('mongodb://localhost/my_database', {useNewUrlParser: true, useUnifiedTopology: true});"}

Querying

Queries the database for documents matching certain criteria.

{"Blog.find({ author: 'John Doe' }).exec((err, blogs) => {\n  if (err) return handleError(err);\n  console.log('The blogs are', blogs);\n});"}

Data Validation

Ensures that the data being saved to the database meets certain criteria defined in the schema.

{"const personSchema = new Schema({\n  name: {\n    type: String,\n    required: true\n  },\n  age: {\n    type: Number,\n    min: 18,\n    max: 65\n  }\n});"}

Middleware (Hooks)

Allows execution of code before or after certain actions, such as saving a document.

{"blogSchema.pre('save', function(next) {\n  if (!this.isModified('title')) {\n    return next();\n  }\n  this.modifiedAt = Date.now();\n  next();\n});"}

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Package last updated on 09 Oct 2024

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