Including associations

How to include a resource and its associations in the same request
When you fetch a resource or a collection, you can include its associations in the same request, using the include query parameter. This reduces the number of roundtrips, optimizing the performances. 
The value of the include parameter must be a comma-separated list of relationship paths (see example). Pay attention to avoid whitespaces before or after each comma. 
A relationship path is a dot-separated list of relationship names (see example).
Examples
Fetching an SKU and some of its associations
Request
Response
The following request fetches the SKU identified by the ID "xYZkjABcde" and the related prices and stock items:
curl -X GET \
  https://yourdomain.commercelayer.io/api/skus/xYZkjABcde?include=prices,stock_items \
  -H 'Accept: application/vnd.api+json' \
  -H 'Authorization: your-access-token' 
On success, the API responds with a 200 OK status code, returning the resource object and the included associations:
{
  "data": {
    "id": "xYZkjABcde",
    "type": "skus",
    "links": {...},
    "attributes": {...},
    "relationships": {
      "shipping_category": {
        "links": {...}
      },
      "prices": {
        "links": {...},
        "data": [
          {
            "type": "prices",
            "id": "yzkWXfgHQS"
          }
        ]
      },
      "stock_items": {
        "links": {...},
        "data": [
          {
            "type": "stock_items",
            "id": "aBmNkPQRst"
          }
        ]
      },
      "delivery_lead_times": {
        "links": {...}
      }
    },
    "meta": {
      "mode": "test"
    }
  },
  "included": [
    {
      "data": {
        "id": "yzkWXfgHQS",
        "type": "prices",
        "links": {...},
        "attributes": {
          "currency_code": "EUR",
          "sku_code": "TSHIRTMM000000FFFFFFXLXX",
          "amount_cents": "10000",
          "amount_float": "100.0",
          "formatted_amount": "€100,00",
          "compare_at_amount_cents": "13000",
          "compare_at_amount_float": "130.00",
          "formatted_compare_at_amount": "€130,00",
          "created_at": "2018-01-01T12:00:00.000Z",
          "updated_at": "2018-01-01T12:00:00.000Z",
          "reference": "ANYREFEFERNCE",
          "metadata": {
            "foo": "bar"
          }
        },
        "relationships": {
          "price_list": {
            "links": {...}
          },
          "sku": {
            "links": {...}
          }
        },
        "meta": {
          "mode": "test"
        }
      }
    },
    {
      "data": {
        "id": "aBmNkPQRst",
        "type": "stock_items",
        "links": {...},
        "attributes": {
          "sku_code": "TSHIRTMM000000FFFFFFXLXX",
          "quantity": "100",
          "created_at": "2018-01-01T12:00:00.000Z",
          "updated_at": "2018-01-01T12:00:00.000Z",
          "reference": "ANYREFEFERNCE",
          "metadata": {
            "foo": "bar"
          }
        },
        "relationships": {
          "stock_location": {
            "links": {...}
          },
          "sku": {
            "links": {...}
          }
        },
        "meta": {
          "mode": "test"
        }
      }
    }
  ]
}
Using relationship paths
Request
Response
The following request features the relationship path prices.price_list as the value of the include parameter, where prices is a relationship listed under an SKU resource object, and price_list is a relationship listed under a price resource object:
curl -X GET \
  http://yourdomain.commercelayer.io/api/skus/xYZkjABcde?include=prices.price_list \
  -H 'Accept: application/vnd.api+json' \
  -H 'Authorization: Bearer your-access-token'
On success, the API responds with a 200 OK status code, returning the resource object and the included associations:
{
  "data": {
    "id": "xYZkjABcde",
    "type": "skus",
    "links": {...},
    "attributes": {
      "code": "TSHIRTMM000000FFFFFFMXXX",
      "name": "Black Men T-shirt with White Logo (M)",
      "description": "Diam phasellus vestibulum lorem sed risus ultricies tristique nulla. Suspendisse ultrices gravida dictum fusce ut placerat orci nulla pellentesque.",
      "image_url": "https://img.yourdomain.com/skus/xYZkjABcde.png",
      "tag_names": "",
      "pieces_per_pack": null,
      "weight": null,
      "unit_of_weight": null,
      "inventory": null,
      "created_at": "2018-01-01T12:00:00.000Z",
      "updated_at": "2018-01-01T12:00:00.000Z",
      "reference": "ANYREFEFERNCE",
      "metadata": {}
    },
    "relationships": {
      "shipping_category": {
        "links": {...}
      },
      "prices": {
        "links": {...},
        "data": [
          {
            "type": "prices",
            "id": "yzkWXfgHQS"
          },
          {
            "type": "prices",
            "id": "WAspXYhfCV"
          },
        ]
      },
      "stock_items": {
        "links": {...}
      },
      "delivery_lead_times": {
        "links": {...}
      },
      "sku_options": {
        "links": {...}
      }
    },
    "meta": {
      "mode": "test"
    }
  },
  "included": [
    {
      "id": "yzkWXfgHQS",
      "type": "prices",
      "links": {...},
      "attributes": {
        "currency_code": "USD",
        "sku_code": "TSHIRTMM000000FFFFFFMXXX",
        "amount_cents": 3480,
        "amount_float": 34.8,
        "formatted_amount": "$34.80",
        "compare_at_amount_cents": 4524,
        "compare_at_amount_float": 45.24,
        "formatted_compare_at_amount": "$45.24",
        "created_at": "2018-01-01T12:00:00.000Z",
        "updated_at": "2018-01-01T12:00:00.000Z",
        "reference": null,
        "metadata": {}
      },
      "relationships": {
        "price_list": {
          "links": {...},
          "data": {
            "type": "price_lists",
            "id": "QWERtyUpBa"
          }
        },
        "sku": {
          "links": {...}
        }
      },
      "meta": {
        "mode": "test"
      }
    },
    {
      "id": "WAspXYhfCV",
      "type": "prices",
      "links": {...},
      "attributes": {
        "currency_code": "EUR",
        "sku_code": "TSHIRTMM000000FFFFFFMXXX",
        "amount_cents": 4900,
        "amount_float": 49,
        "formatted_amount": "€49,00",
        "compare_at_amount_cents": 4900,
        "compare_at_amount_float": 49,
        "formatted_compare_at_amount": "€49,00",
        "created_at": "2018-01-01T12:00:00.000Z",
        "updated_at": "2018-01-01T12:00:00.000Z",
        "reference": null,
        "metadata": {}
      },
      "relationships": {
        "price_list": {
          "links": {...},
          "data": {
            "type": "price_lists",
            "id": "saDFGhjkLZ"
          }
        },
        "sku": {
          "links": {...}
        }
      },
      "meta": {
        "mode": "test"
      }
    },
    {
      "id": "QWERtyUpBa",
      "type": "price_lists",
      "links": {...},
      "attributes": {
        "name": "USD Price List",
        "currency_code": "USD",
        "tax_included": false,
        "created_at": "2018-01-01T12:00:00.000Z",
        "updated_at": "2018-01-01T12:00:00.000Z",
        "reference": null,
        "metadata": {}
      },
      "relationships": {
        "prices": {
          "links": {...}
        }
      },
      "meta": {
        "mode": "test"
      }
    },
    {
      "id": "saDFGhjkLZ",
      "type": "price_lists",
      "links": {...},
      "attributes": {
        "name": "EUR Price List",
        "currency_code": "EUR",
        "tax_included": true,
        "created_at": "2018-01-01T12:00:00.000Z",
        "updated_at": "2018-01-01T12:00:00.000Z",
        "reference": null,
        "metadata": {}
      },
      "relationships": {
        "prices": {
          "links": {...}
        }
      },
      "meta": {
        "mode": "test"
      }
    }
  ]
}
You can request to include associations also when creating or updating resources.
Fetching resources
Sparse fieldsets
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