feat(GeoFirestore): add method for collectionGroup, fixes #187

src/GeoFirestore.ts

@@ -1,6 +1,7 @@
 import {GeoFirestoreTypes} from 'geofirestore-core';
 
 import {GeoCollectionReference} from './GeoCollectionReference';
+import {GeoQuery} from './GeoQuery';
 import {GeoWriteBatch} from './GeoWriteBatch';
 
 /**
@@ -54,6 +55,20 @@ export class GeoFirestore {
     );
   }
 
+  /**
+   * Creates and returns a new GeoQuery that includes all documents in the
+   * database that are contained in a collection or subcollection with the
+   * given collectionId.
+   *
+   * @param collectionId Identifies the collections to query over. Every
+   * collection or subcollection with this ID as the last segment of its path
+   * will be included. Cannot contain a slash.
+   * @return The created GeoQuery.
+   */
+  collectionGroup(collectionId: string): GeoQuery {
+    return new GeoQuery(this._firestore.collectionGroup(collectionId));
+  }
+
   /**
    * Executes the given updateFunction and then attempts to commit the changes applied within the transaction. If any document read within
    * the transaction has changed, the updateFunction will be retried. If it fails to commit after 5 attempts, the transaction will fail.

test/GeoFirestore.test.ts

@@ -46,7 +46,7 @@ describe('GeoFirestore Tests:', () => {
 
   describe('batch():', () => {
     it('batch() returns a new GeoWriteBatch based on a Firestore WriteBatch', () => {
-      expect(new GeoFirestore(firestore).batch()['_writeBatch']).to.deep.equal(
+      expect(new GeoFirestore(firestore).batch().native).to.deep.equal(
         firestore.batch()
       );
     });
@@ -55,13 +55,19 @@ describe('GeoFirestore Tests:', () => {
   describe('collection():', () => {
     it('collection() returns a new GeoCollectionReference based on a Firestore CollectionReference', () => {
       expect(
-        new GeoFirestore(firestore).collection(testCollectionName)[
-          '_collection'
-        ]
+        new GeoFirestore(firestore).collection(testCollectionName).native
       ).to.deep.equal(firestore.collection(testCollectionName));
     });
   });
 
+  describe('collectionGroup():', () => {
+    it('collectionGroup() returns a new GeoQuery based on a Firestore Query', () => {
+      expect(
+        new GeoFirestore(firestore).collectionGroup(testCollectionName).native
+      ).to.deep.equal(firestore.collectionGroup(testCollectionName));
+    });
+  });
+
   describe('runTransaction():', () => {
     it("runTransaction() doesn't throw an error when a valid `updateFunction` is passed in", () => {
       expect(() =>