Relationships: روابط در دیتابیس 🔗

Relationships برای ارتباط بین tables/collections استفاده میشن!

Mongoose Relationships:

// User Schema
const userSchema = new mongoose.Schema({
    name: String,
    email: String
});

// Post Schema با reference به User
const postSchema = new mongoose.Schema({
    title: String,
    content: String,
    author: {
        type: mongoose.Schema.Types.ObjectId,
        ref: 'User'
    }
});

const User = mongoose.model('User', userSchema);
const Post = mongoose.model('Post', postSchema);

// استفاده با populate
const post = await Post.findById(postId).populate('author');
console.log(post.author.name);

Sequelize Relationships:

// User Model
const User = sequelize.define('User', {
    name: DataTypes.STRING,
    email: DataTypes.STRING
});

// Post Model
const Post = sequelize.define('Post', {
    title: DataTypes.STRING,
    content: DataTypes.TEXT
});

// Relationship
User.hasMany(Post);
Post.belongsTo(User);

// استفاده
const user = await User.findByPk(userId, {
    include: Post
});