Improved projection links with Spring Data REST

after.json

{
  "_embedded" : {
    "orders" : [ {
      "items" : [ {
        "description" : "Lakewood guitar",
        "price" : 1299.00
      } ],
      "_embedded" : {
        "customer" : {
          "address" : "4711 Some Place, 54321 Charlottesville, VA",
          "firstname" : "Dave",
          "lastname" : "Matthews",
          "_links" : {
            "self" : {
              "href" : "http://localhost:8080/customers/1{?projection}",
              "templated" : true
            }
          }
        }
      },
      "_links" : {
        "self" : {
          "href" : "http://localhost:8080/orders/1"
        },
        "customer" : {
          "href" : "http://localhost:8080/orders/1/customer"
        }
      }
    } ]
  }
}

before.json

{
  "items": [
    {
      "description": "Lakewood guitar",
      "price": 1299
    }
  ],
  "_embedded": {
    "customer": {
      "address": "4711 Some Place, 54321 Charlottesville, VA",
      "firstname": "Dave",
      "lastname": "Matthews"
    }
  },
  "_links": {
    "self": {
      "href": "http://localhost:8080/orders/1"
    },
    "customer": {
      "href": "http://localhost:8080/orders/1/customer"
    }
  }
}

What version of what exactly do we need to get this?

I think, this is just an idea, which is not impemented yet.
Related issue: https://jira.spring.io/browse/DATAREST-682