From ff4c8042d7c5bf55ab9cb2d332a1629e92cc5e03 Mon Sep 17 00:00:00 2001
From: JP Rosevear <jpr@jprosevear.org>
Date: Tue, 21 Mar 2017 10:57:59 -0400
Subject: [PATCH] Support cardinality metric aggregator (#876)

---
 lib/searchkick/query.rb |  6 ++++++
 test/aggs_test.rb       | 14 ++++++++++++++
 2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/lib/searchkick/query.rb b/lib/searchkick/query.rb
index 5debdbb..c05ab30 100644
--- a/lib/searchkick/query.rb
+++ b/lib/searchkick/query.rb
@@ -643,6 +643,12 @@ module Searchkick
               interval: interval
             }
           }
+        elsif agg_options[:cardinality]
+          payload[:aggs][field] = {
+            cardinality: {
+              field: agg_options[:cardinality][:field] || field
+            }
+          }
         else
           payload[:aggs][field] = {
             terms: {
diff --git a/test/aggs_test.rb b/test/aggs_test.rb
index f1911de..7f51347 100644
--- a/test/aggs_test.rb
+++ b/test/aggs_test.rb
@@ -116,6 +116,20 @@ class AggsTest < Minitest::Test
     assert_equal 4, products.aggs["products_per_year"]["buckets"].size
   end
 
+  def test_aggs_cardinality
+    products =
+      Product.search("*", {
+        aggs: {
+          total_stores: {
+            cardinality: {
+              field: :store_id
+            }
+          }
+        }
+      })
+    assert_equal 3, products.aggs["total_stores"]["value"]
+  end
+
   protected
 
   def buckets_as_hash(agg)
--
libgit2 0.21.0