add sort value to publishers serializer in the example

Author: barseghyanartur

docker-compose.yml

@@ -3,20 +3,24 @@ version: '3'
 services:
 
   elasticsearch:
+    container_name: django_elasticsearch_dsl_drf_elasticsearch
     build:
       context: .
       dockerfile: ./docker/elasticsearch/Dockerfile
     image: docker.elastic.co/elasticsearch/elasticsearch:6.3.2
-    container_name: django_elasticsearch_dsl_drf_elasticsearch
     volumes:
     - esdata:/usr/share/elasticsearch/data
     ports:
     - 9200:9200
     - 9300:9300
     environment:
-    - bootstrap.memory_lock=true
+#    - bootstrap.memory_lock=true
+    - discovery.type=single-node
     - xpack.security.enabled=false
     - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
+    - cluster.routing.allocation.disk.watermark.low=97%
+    - cluster.routing.allocation.disk.watermark.high=98%
+    - cluster.routing.allocation.disk.watermark.flood_stage=99%
 
   backend:
     container_name: django_elasticsearch_dsl_drf_backend

docs_src/installing_elasticsearch.rst

@@ -41,6 +41,16 @@ Docker
     docker pull docker.elastic.co/elasticsearch/elasticsearch:6.4.0
     docker run -p 9200:9200 -e "discovery.type=single-node" -e "xpack.security.enabled=false" docker.elastic.co/elasticsearch/elasticsearch:6.4.0
 
+7.x
+~~~
+**7.1.1**
+
+.. code-block:: sh
+
+    docker pull docker.elastic.co/elasticsearch/elasticsearch:7.1.1
+    docker run -p 9200:9200 -e "discovery.type=single-node" -e "xpack.security.enabled=false" docker.elastic.co/elasticsearch/elasticsearch:7.1.1
+
+
 Vagrant
 -------
 2.x

examples/simple/search_indexes/serializers/publisher.py

@@ -20,6 +20,7 @@ class PublisherDocumentSerializer(serializers.Serializer):
     country = serializers.CharField(read_only=True)
     website = serializers.CharField(read_only=True)
     location = serializers.SerializerMethodField()
+    sort_value = serializers.SerializerMethodField()
 
     class Meta(object):
         """Meta options."""
@@ -60,6 +61,13 @@ def get_location(self, obj):
         except Exception:
             return {}
 
+    def get_sort_value(self, obj):
+        """Represent sort value."""
+        try:
+            return obj.meta.sort._l_[0]
+        except Exception:
+            return None
+
 
 class PublisherDocumentSimpleSerializer(DocumentSerializer):
     """Serializer for Publisher document."""