Add support for "array-contains" where operator.

Author: boyko

src/firestore-query.js

@@ -126,7 +126,7 @@ MockFirestoreQuery.prototype.where = function (property, operator, value) {
   var query;
 
   // check if unsupported operator
-  if (operator !== '==') {
+  if (['==', 'array-contains'].indexOf(operator) === -1) {
     console.warn('Using unsupported where() operator for firebase-mock, returning entire dataset');
     return this;
   } else {
@@ -139,6 +139,12 @@ MockFirestoreQuery.prototype.where = function (property, operator, value) {
               results[key] = _.cloneDeep(data);
             }
             break;
+          case  'array-contains':
+            var dt = _.get(data, property);
+            if (Array.isArray(dt) && dt.indexOf(value) > -1) {
+              results[key] = _.cloneDeep(data);
+            }
+            break;
           default:
             results[key] = _.cloneDeep(data);
             break;

test/unit/data.json

@@ -85,21 +85,30 @@
       "name_type": "string",
       "complex": {
         "name": "a"
-      }
+      },
+      "array": [
+        "a", "b"
+      ]
     },
     "b": {
       "name": "b",
       "name_type": "string",
       "complex": {
         "name": "b"
-      }
+      },
+      "array": [
+        "a", "c"
+      ]
     },
     "c": {
       "name": "c",
       "name_type": "string",
       "complex": {
         "name": "c"
-      }
+      },
+      "array": [
+        "b", "c"
+      ]
     },
     "1": {
       "name": 1,

test/unit/firestore-collection.js

@@ -228,6 +228,15 @@ describe('MockFirestoreCollection', function () {
       ]);
     });
 
+    it('returns matched documents for operator "array-contains"', function() {
+      var results1 = collection.where('array', 'array-contains', 'a').get();
+      db.flush();
+
+      return Promise.all([
+        expect(results1).to.eventually.have.property('size').to.equal(2),
+      ]);
+    });
+
     it('returns all documents when using unsupported operator', function() {
       var expected = 6;