support multiple inline fragments

Author: Jeniffer Lima Graf

src/__tests__/jsonToGraphQLQuery.tests.ts

@@ -464,6 +464,27 @@ describe('jsonToGraphQL()', () => {
         );
     });
 
+    it('supports multiple inline fragments', () => {
+        const query = {
+            query: {
+                Posts: {
+                    __on: [
+                    {
+                        __fragmentName: "ConfigurablePost",
+                        id: true
+                    },
+                    {
+                        __fragmentName: "UnconfigurablePost",
+                        name: true
+                    }]
+                }
+            }
+        };
+        expect(jsonToGraphQLQuery(query)).to.equal(
+            'query { Posts { ... on ConfigurablePost { id } ... on UnconfigurablePost { name } } }'
+        );
+    });
+
     it('we can ignore apollo __typename keys', () => {
         const query = {
             query: {

src/jsonToGraphQLQuery.ts

@@ -126,12 +126,13 @@ function convertQuery(node: any, level: number, output: Array<[ string, number ]
                 convertQuery(node[key], level + 1, output, options);
 
                 if (inlineFragmentsExist) {
-                    let inlineFragment = node[key].__on;
-                    if (inlineFragment && inlineFragment.__fragmentName) {
-                        output.push([`... on ${inlineFragment.__fragmentName} {`, level + 1]);
+                    let inlineFragments: Array<{__fragmentName: string}> = node[key].__on instanceof Array ? node[key].__on : [node[key].__on];
+                    inlineFragments.forEach((inlineFragment) => {
+                        let name = inlineFragment.__fragmentName;
+                        output.push([`... on ${name} {`, level + 1]);
                         convertQuery(inlineFragment, level + 2, output, options);
                         output.push([ '}', level + 1 ]);
-                    }
+                    });
                 }
 
                 if (subFields || inlineFragmentsExist) {