Relationships.md

Relationships

How to show relationships between MongoDB documents.

Embedding Documents:

Embed documents inside other documents (i.e. reviews array), to establish relationship

> db.products.insert(
  {
    _id: 3,
    name: "Eraser",
    price: 1.30,
    stock: 43,
    reviews: [
      {
        authorName: "Sally",
        rating: 5,
        review: "Best eraser ever!"
      },
      {
        authorName: "John",
        rating: 5,
        review: "Awesome eraser!"
      }
    ]
  }
)

Link Documents with IDs:

{
  _id: 1,
  name: "Pen",
  price: 1.20,
  stock: 32
}

{
  _id: 2,
  name: "Pencil",
  price: 0.80,
  stock: 12
}

{
  orderNumber: 3243,
  productsOrdered: [1, 2]
}