[BUG] in PATCH v2/entities/<id> with new metadatas are appened instead of to replaced

[iariasleon]

in PATCH v2/entities/ with new metadatas are appened instead of to replaced.

Two metadata for create request and one metadata for PATCH request and finally there are three metadata in mongo, when there should only be one, the update metadata.

Create request

POST http://localhost:1026/v2/entities
Content-Type: application/json
Fiware-Service: test_attribute_metadata_name_update
Fiware-ServicePath: /test
{
   "type": "house", 
   "temperature": {
            "type": "celcius", 
            "value": "34", 
            "metadata": {
                        "warning_0": {"type": "alarm", "value": "hot"}, 
                        "warning_1": {"type": "alarm", "value": "hot"}}}, 
   "id": "room_1"}

Update request

PATCH http://qa-orion-fe-02:1026/v2/entities/room_1
Content-Type: application/json
Fiware-Service: test_attribute_metadata_name_update
Fiware-ServicePath: /test
{
         "temperature": {
                "value": "45", 
                "metadata": {
                       "my_meta": {"type": "nothing", "value": "5678"}}}}

Mongo doc

[{
      "modDate": 1455202600, "attrNames": ["temperature"], "_id": {"type": "house", "id": "room_1", "servicePath": "/test"}, 
      "attrs": {"temperature": {
                   "md": [
                           {"type": "nothing", "name": "my_meta", "value": "5678"}, 
                           {"type": "alarm", "name": "warning_0", "value": "hot"}, 
                           {"type": "alarm", "name": "warning_1", "value": "hot"}], 
                    "modDate": 1455202600, 
                    "type": "celcius", 
                    "value": "45", 
                    "creDate": 1455202600}}, 
     "creDate": 1455202600}]

expected in mongo (only a metadata)

      "modDate": 1455202600, "attrNames": ["temperature"], "_id": {"type": "house", "id": "room_1", "servicePath": "/test"}, 
      "attrs": {"temperature": {
                   "md": [
                            {"type": "nothing", "name": "my_meta", "value": "5678"}], 
                    "modDate": 1455202600, 
                    "type": "celcius", 
                    "value": "45", 
                    "creDate": 1455202600}}, 
     "creDate": 1455202600}]

[fgalan]

Fixed by PR #2649. @iariasleon , ready for re-test, pls.

[iariasleon]

LGTM

{ "_id" : { "id" : "room_1", "type" : "house", "servicePath" : "/test" }, "attrNames" : [ "temperature" ], "attrs" : { "temperature" : { "value" : null, "type" : "None", "md" : { "my_meta" : { "type" : "nothing", "value" : "5678" } }, "mdNames" : [ "my_meta" ], "creDate" : 1478790632, "modDate" : 1478790632 } }, "creDate" : 1478790632, "modDate" : 1478790632 }