Add support for JSON arguments

Author: dupski

README.md

@@ -11,6 +11,12 @@ Mainly useful for applications that need to generate graphql queries dynamically
 npm install json-to-graphql-query
 ```
 
+## Features
+
+ * Converts a JavaScript object to a GraphQL Query
+ * Supports nested objects & arguments
+ * Supports JSON input types for arguments (see arguments example below)
+
 ## Usage
 
 **jsonToGraphQLQuery(** queryObject: object, options?: object **)**
@@ -56,8 +62,8 @@ const query = {
     query: {
         Posts: {
             __args: {
-                orderBy: 'post_date',
-                userId: 12
+                where: { id: 2 }
+                orderBy: 'post_date'
             },
             id: true,
             title: true,
@@ -72,7 +78,7 @@ Resulting `graphql_query`
 
 ```graphql
 query {
-    Posts (orderBy: "post_date", userId: 12) {
+    Posts (where: {id: 2}, orderBy: "post_date") {
         id
         title
         post_date

src/__tests__/jsonToGraphQLQuery.tests.ts

@@ -42,7 +42,7 @@ describe('jsonToGraphQL()', () => {
 }`);
     });
 
-    it('converts a query with arguments', () => {
+    it('converts a query with simple arguments', () => {
         const query = {
             query: {
                 Posts: {
@@ -66,6 +66,33 @@ describe('jsonToGraphQL()', () => {
 }`);
     });
 
+    it('converts a query with JSON arguments', () => {
+        const query = {
+            query: {
+                Posts: {
+                    __args: {
+                        where: {
+                            published: true,
+                            rating: { _gt: 3 }
+                        },
+                        orderBy: 'post_date'
+                    },
+                    id: true,
+                    title: true,
+                    post_date: true
+                }
+            }
+        };
+        expect(jsonToGraphQLQuery(query, { pretty: true })).to.equal(
+`query {
+    Posts (where: {published: true, rating: {_gt: 3}}, orderBy: "post_date") {
+        id
+        title
+        post_date
+    }
+}`);
+    });
+
     it('converts a query with nested objects', () => {
         const query = {
             query: {

src/jsonToGraphQLQuery.ts

@@ -1,8 +1,23 @@
 
+function stringify(obj_from_json: any) {
+    // Cheers to Derek: https://stackoverflow.com/questions/11233498/json-stringify-without-quotes-on-properties
+    if (typeof obj_from_json !== 'object' || Array.isArray(obj_from_json)) {
+        // not an object, stringify using native function
+        return JSON.stringify(obj_from_json);
+    }
+    // Implements recursive object serialization according to JSON spec
+    // but without quotes around the keys.
+    const props: string = Object
+        .keys(obj_from_json)
+        .map((key) => `${key}: ${stringify(obj_from_json[key])}`)
+        .join(', ');
+    return `{${props}}`;
+}
+
 function buildArgs(argsObj: any): string {
     const args = [];
     for (const argName in argsObj) {
-        args.push(`${argName}: ${JSON.stringify(argsObj[argName])}`);
+        args.push(`${argName}: ${stringify(argsObj[argName])}`);
     }
     return args.join(', ');
 }