Display the comments count in the feed

[Abbe98]

@bjornhjelle this requires that the comment count is returned by observations/<id>.

[bjornhjelle]

Fixed in back end. Now returns: "comments_count": 3,

In both GET /observations/ and GET /observations

[Abbe98]

Amazing @bjornhjelle I have now implemented this and moved in to "Shipping" on the project board: https://github.com/Biocaching/issues/projects/1?fullscreen=true

[Abbe98]

@bjornhjelle the following observation has 3 comments but still comments_count is set to 1:

   {
      "_index": "observations",
      "_type": "observation",
      "_id": "130",
      "_score": null,
      "_source": {
        "id": 130,
        "observed_at": "2016-08-08T12:14:00.000+02:00",
        "user_id": 3,
        "comment": "",
        "created_at": "2016-08-08T12:21:53.000+02:00",
        "updated_at": "2016-08-08T12:21:53.000+02:00",
        "what3words": "animal.brush.routines",
        "individual_count": 1,
        "sex": "",
        "life_stage": "",
        "country": "Norway",
        "county": "Oslo",
        "municipality": "Oslo",
        "locality": "Brekke",
        "geonames_id": "9404473",
        "coordinate_uncertainty_in_meters": null,
        "is_public": true,
        "location_id": "http://sws.geonames.org/9404473",
        "location": {
          "lat": "59.96279",
          "lon": "10.755615"
        },
        "tags": [

        ],
        "tags_suggest": {
          "input": [

          ]
        },
        "verified_by": null,
        "points": 1,
        "comments_count": 1,
        "taxon": {
          "id": 70852,
          "scientific_name": "pica pica",
          "all_common_names": {
            "eng": [
              "Black-billed Magpie"
            ],
            "fra": [
              "pie bavarde"
            ],
            "nob": [
              "skjære"
            ],
            "nno": [
              "skjor"
            ],
            "ces": [
              "straka obecná"
            ]
          }
        },
        "likes": [

        ],
        "other_pictures": [

        ]
      },
      "sort": [
        1470651713000
      ]
    },

[bjornhjelle]

Should now be fixed so that adding or removing comments triggers a re-indexing of the observation in Elasticsearch. When getting a single observation the count is correct, since the observation is then fetched from the database, not from Elasticsearch.