{
  "id": "/cart-item",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "title": "Cart Item",
  "description": "Items in a user's cart",
  "type": "object",
  "definitions": {
    "identifier": {
      "type": "integer",
      "description": "The identifier of where the item is in the cart",
      "example": 1
    },
    "quantity": {
      "type": "number",
      "description": "The amount of product that is desired",
      "example": 2
    }
  },
  "properties": {
    "ID": {
      "$ref": "#/definitions/identifier"
    },
    "product": {
      "$ref": "./product.json"
    },
    "quantity": {
      "$ref": "#/definitions/quantity"
    }
  },
  "links": [
    {
      "title": "Add product to cart",
      "description": "Add a product to your cart",
      "rel": "self",
      "href": "/cart/{#/definitions/identifier}",
      "method": "POST",
      "authentication_needed": true,
      "required": ["product", "quantity"],
      "schema": {
        "type": "object",
        "properties": {
          "product": {
            "$ref": "./product.json"
          },
          "quantity": {
            "$ref": "#/definitions/quantity"
          }
        }
      },
      "targetSchema": {"rel": "self"}
    },
    {
      "title": "All items in cart",
      "description": "All items a user has added to their cart",
      "rel": "instances",
      "href": "/cart",
      "method": "GET",
      "authentication_needed": true,
      "targetSchema": {
        "type": "object",
        "properties": {
          "items": {
            "type": "array",
            "items": {"rel": "self"}
          }
        }
      }
    },
    {
      "title": "Cart item info",
      "description": "Info about a specific item in the cart",
      "rel": "self",
      "href": "/cart/{#/definitions/identifier}",
      "method": "GET",
      "authentication_needed": "yes",
      "targetSchema": {"rel": "self"}
    },
    {
      "title": "Update an item",
      "description": "Update information about the item in your cart",
      "rel": "self",
      "href": "/cart/{#/definitions/identifier}",
      "method": "PUT",
      "authentication_needed": true,
      "required": ["quantity"],
      "schema": {
        "type": "object",
        "properties": {
          "quantity": {
            "$ref": "#/definitions/quantity"
          }
        }
      },
      "targetSchema": {"rel": "self"}
    },
    {
      "title": "Remove a cart item",
      "description": "Remove an item from your cart",
      "rel": "self",
      "href": "/cart/{#/definitions/identifier}",
      "method": "DELETE",
      "targetSchema": {
        "type": "object",
        "properties": {
          "ID": {"$ref": "#/definitions/identifier"}
        }
      }
    }
  ]
}