Add ability to provide default field resolvers

apollographql · Jul 24, 2017 · 94f69d2 · 94f69d2
1 parent fa38e4d
commit 94f69d2
Show file tree

Hide file tree

Showing 2 changed files with 53 additions and 0 deletions.
diff --git a/packages/apollo-server-core/src/runQuery.test.ts b/packages/apollo-server-core/src/runQuery.test.ts
@@ -33,6 +33,21 @@ const queryType = new GraphQLObjectType({
                 return 'it works';
             },
         },
+        testObject: {
+          type: new GraphQLObjectType({
+            name: 'TestObject',
+            fields: {
+              testString: {
+                type: GraphQLString,
+              },
+            },
+          }),
+          resolve() {
+            return {
+              testString: 'a very test string',
+            };
+          },
+        },
         testRootValue: {
             type: GraphQLString,
             resolve(root) {
@@ -265,4 +280,39 @@ describe('runQuery', () => {
             expect(logs[10]).to.deep.equals({action: LogAction.request, step: LogStep.end});
         });
     });
+
+    it('uses custom field resolver', async () => {
+      const query = `
+        query Q1 {
+          testObject {
+            testString
+          }
+        }
+      `;
+
+      const result1 = await runQuery({
+          schema,
+          query: query,
+          operationName: 'Q1',
+      })
+
+      expect(result1.data).to.deep.equal({
+          testObject: {
+            testString: 'a very test string',
+          },
+      });
+
+      const result2 = await runQuery({
+          schema,
+          query: query,
+          operationName: 'Q1',
+          fieldResolver: () => 'a very testful field resolver string',
+      });
+
+      expect(result2.data).to.deep.equal({
+          testObject: {
+              testString: 'a very testful field resolver string',
+          }
+      });
+    });
 });
diff --git a/packages/apollo-server-core/src/runQuery.ts b/packages/apollo-server-core/src/runQuery.ts
@@ -1,5 +1,6 @@
 import {
     GraphQLSchema,
+    GraphQLFieldResolver,
     ExecutionResult,
     DocumentNode,
     parse,
@@ -44,6 +45,7 @@ export interface QueryOptions {
  operationName?: string;
  logFunction?: LogFunction;
  validationRules?: Array<(context: ValidationContext) => any>;
+ fieldResolver?: GraphQLFieldResolver<any, any>,
  // WARNING: these extra validation rules are only applied to queries
  // submitted as string, not those submitted as Document!
 
@@ -128,6 +130,7 @@ function doRunQuery(options: QueryOptions): Promise<ExecutionResult> {
             options.context,
             options.variables,
             options.operationName,
+            options.fieldResolver,
         ).then(gqlResponse => {
             logFunction({action: LogAction.execute, step: LogStep.end});
             logFunction({action: LogAction.request, step: LogStep.end});