fix: prevents runtime error on undefined facets

It is not safe to assume that facets is going to be in the response

Author: gerardosabetta

fixtures/host-2376rb.api.swiftype.com-443/disjunctive_license_returning_no_facets

@@ -0,0 +1,29 @@
+POST /api/as/v1/engines/node-modules/search.json
+authorization: Bearer api-hean6g8dmxnm2shqqiag757a
+content-type: application/json
+x-swiftype-client: elastic-app-search-javascript
+x-swiftype-client-version: 8.7.0
+accept: */*
+accept-encoding: gzip,deflate
+body: {\"query\":\"dog\",\"page\":{\"size\":0},\"filters\":{},\"facets\":{\"license\":[{\"type\":\"value\",\"size\":3}]},\"record_analytics\":false,\"analytics\":{\"tags\":[\"Facet-Only\"]}}
+
+HTTP/1.1 200 OK
+date: Thu, 27 Sep 2018 20:36:08 GMT
+content-type: application/json; charset=utf-8
+transfer-encoding: chunked
+connection: close
+vary: Accept-Encoding, Origin
+status: 200 OK
+x-frame-options: SAMEORIGIN
+x-xss-protection: 1; mode=block
+x-content-type-options: nosniff
+etag: W/"d31aa222a68122cb8392577cf4a1a7f1"
+cache-control: max-age=0, private, must-revalidate
+x-request-id: 91197d45d104a3e2281a60eecec630ff
+x-runtime: 0.270027
+x-swiftype-frontend-datacenter: dal05
+x-swiftype-frontend-node: web01.dal05
+x-swiftype-edge-datacenter: dal05
+x-swiftype-edge-node: web01.dal05
+
+{"meta":{"warnings":[],"page":{"current":1,"total_pages":0,"total_results":0,"size":1},"request_id":"91197d45d104a3e2281a60eecec630ff"},"results":[]}

fixtures/host-2376rb.api.swiftype.com-443/search_filter_and_multi_facet_with_disjuntive_returning_no_facets

@@ -0,0 +1,29 @@
+POST /api/as/v1/engines/node-modules/search.json
+authorization: Bearer api-hean6g8dmxnm2shqqiag757a
+content-type: application/json
+x-swiftype-client: elastic-app-search-javascript
+x-swiftype-client-version: 8.7.0
+accept: */*
+accept-encoding: gzip,deflate
+body: {\"query\":\"dog\",\"page\":{\"size\":1},\"filters\":{\"license\":\"BSD\"},\"facets\":{\"license\":[{\"type\":\"value\",\"size\":3}],\"dependencies\":[{\"type\":\"value\",\"size\":3}]}}
+
+HTTP/1.1 200 OK
+date: Thu, 27 Sep 2018 20:53:56 GMT
+content-type: application/json; charset=utf-8
+transfer-encoding: chunked
+connection: close
+vary: Accept-Encoding, Origin
+status: 200 OK
+x-frame-options: SAMEORIGIN
+x-xss-protection: 1; mode=block
+x-content-type-options: nosniff
+etag: W/"5010d52221547ddec5baceeb9f8a4931"
+cache-control: max-age=0, private, must-revalidate
+x-request-id: 8369bdda4d5c018ddbd85fc2859fbadb
+x-runtime: 0.212519
+x-swiftype-frontend-datacenter: dal05
+x-swiftype-frontend-node: web01.dal05
+x-swiftype-edge-datacenter: dal05
+x-swiftype-edge-node: web01.dal05
+
+{"meta":{"warnings":[],"page":{"current":1,"total_pages":0,"total_results":0,"size":10},"request_id":"8369bdda4d5c018ddbd85fc2859fbadb"},"results":[]}

src/client.js

@@ -189,12 +189,17 @@ export default class Client {
 
     return Promise.all([baseQueryPromise, ...disjunctiveQueriesPromises]).then(
       ([baseQueryResults, ...disjunctiveQueries]) => {
-        disjunctiveQueries.forEach(disjunctiveQueryResults => {
-          const [facetName, facetValue] = Object.entries(
-            disjunctiveQueryResults.facets
-          )[0];
-          baseQueryResults.facets[facetName] = facetValue;
-        });
+        if (
+          baseQueryResults.facets &&
+          Object.keys(baseQueryResults.facets).length
+        ) {
+          disjunctiveQueries.forEach(disjunctiveQueryResults => {
+            const [facetName, facetValue] = Object.entries(
+              disjunctiveQueryResults.facets
+            )[0];
+            baseQueryResults.facets[facetName] = facetValue;
+          });
+        }
         return baseQueryResults;
       }
     );

tests/client.spec.js

@@ -248,6 +248,24 @@ describe("Client", () => {
         });
       });
 
+      // Fixture: disjunctive_license_returning_no_facets
+      // Fixture: search_filter_and_multi_facet_returning_no_facets
+      it("will handle not having `facets` in the backend response without throwing", async () => {
+        const result = await client.search("dog", {
+          ...config,
+          filters: {
+            license: "BSD"
+          },
+          facets: {
+            license: [{ type: "value", size: 3 }],
+            dependencies: [{ type: "value", size: 3 }]
+          },
+          disjunctiveFacets: ["license", "dependencies"]
+        });
+
+        expect(result.info.facets).toBeUndefined();
+      });
+
       // Fixture: disjunctive_license_with_override_tags
       // Fixture: Fixture: search_filter_and_multi_facet_with_tags
       it("will accept an alternative analytics tag for disjunctive queries", async () => {