added alias support and made it possible to disable fields

Author: wellguimaraes

.gitignore

@@ -3,4 +3,5 @@ lib
 *.lock
 *.log
 *.tgz
-package-lock.json
+package-lock.json
+.idea/

README.md

@@ -127,6 +127,76 @@ query {
 }
 ```
 
+### Query with disabled fields
+
+```typescript
+import { jsonToGraphQLQuery } from 'json-to-graphql-query';
+
+const query = {
+    query: {
+        Posts: {
+            id: true,
+            title: false,
+            comments: {
+                id: true,
+                comment: false,
+                user: true
+            }
+        },
+        User: false
+    }
+};
+const graphql_query = jsonToGraphQLQuery(query, { pretty: true });
+```
+
+Resulting `graphql_query`
+
+```graphql
+query {
+    Posts {
+        id
+        comments {
+            id
+            user
+        }
+    }
+}
+```
+
+### Use aliases
+
+```typescript
+import { jsonToGraphQLQuery } from 'json-to-graphql-query';
+
+const query = {
+    query: {
+        Posts: {
+            __alias: 'allPosts',
+            id: true,
+            comments: {
+                id: true,
+                comment: true
+            }
+        }
+    }
+};
+const graphql_query = jsonToGraphQLQuery(query, { pretty: true });
+```
+
+Resulting `graphql_query`
+
+```graphql
+query {
+    allPosts:Posts {
+        id
+        comments {
+            id
+            comment
+        }
+    }
+}
+```
+
 ## TO-DO List
 
  * Fragments

package.json

@@ -1,6 +1,6 @@
 {
   "name": "json-to-graphql-query",
-  "version": "1.1.3",
+  "version": "1.2.0",
   "main": "lib/index.js",
   "license": "MIT",
   "scripts": {

src/__tests__/jsonToGraphQLQuery.tests.ts

@@ -266,4 +266,42 @@ describe('jsonToGraphQL()', () => {
             'query { Posts (arg1: 20, arg2: "flibble") { id title } }'
         );
     });
+
+    it('uses aliases for fields', () => {
+      const query = {
+        query: {
+            Posts: {
+                __alias: 'lorem',
+                __args: {
+                    arg1: 20,
+                },
+                id: true
+            }
+        }
+      };
+      expect(jsonToGraphQLQuery(query)).to.equal(
+        'query { lorem:Posts (arg1: 20) { id } }'
+      );
+    });
+
+    it('does not include fields which value is false', () => {
+      const query = {
+        query: {
+            Posts: {
+                __args: {
+                  a: false
+                },
+                id: true,
+                name: false
+            },
+            Lorem: {
+              id: true
+            },
+            Ipsum: false
+        }
+      };
+      expect(jsonToGraphQLQuery(query)).to.equal(
+        'query { Posts (a: false) { id } Lorem { id } }'
+      );
+    });
 });

src/jsonToGraphQLQuery.ts

@@ -16,6 +16,7 @@ function stringify(obj_from_json: any): string {
         .keys(obj_from_json)
         .map((key) => `${key}: ${stringify(obj_from_json[key])}`)
         .join(', ');
+
     return `{${props}}`;
 }
 
@@ -33,11 +34,12 @@ function getIndent(level: number): string {
 
 function convertQuery(node: any, level: number, output: Array<[string, number]>) {
     for (const key in node) {
-        if (key != '__args') {
+        if (key != '__args' && key != '__alias') {
             if (typeof node[key] == 'object') {
                 const fieldCount = Object.keys(node[key]).length;
                 let token: string;
                 let subFields: boolean;
+
                 if (typeof node[key].__args == 'object') {
                     token = `${key} (${buildArgs(node[key].__args)})`;
                     subFields = fieldCount > 1;
@@ -46,13 +48,18 @@ function convertQuery(node: any, level: number, output: Array<[string, number]>)
                     token = `${key}`;
                     subFields = fieldCount > 0;
                 }
+
+                if (typeof node[key].__alias == 'string') {
+                    token = `${node[key].__alias}:${token}`;
+                }
+
                 output.push([token + (subFields ? ' {' : ''), level]);
                 convertQuery(node[key], level + 1, output);
                 if (subFields) {
                     output.push(['}', level]);
                 }
             }
-            else {
+            else if (node[key] !== false) {
                 output.push([`${key}`, level]);
             }
         }