Added rest option: excludeKeys (#5737)

* Added restOption: excludeKeys

* improve tests

src/RestQuery.js

@@ -13,6 +13,7 @@ const AlwaysSelectedKeys = ['objectId', 'createdAt', 'updatedAt', 'ACL'];
 //   count
 //   include
 //   keys
+//   excludeKeys
 //   redirectClassNameForKey
 //   readPreference
 //   includeReadPreference
@@ -102,6 +103,13 @@ function RestQuery(
         this.keys = Array.from(new Set(keys));
         break;
       }
+      case 'excludeKeys': {
+        const exclude = restOptions.excludeKeys
+          .split(',')
+          .filter(k => AlwaysSelectedKeys.indexOf(k) < 0);
+        this.excludeKeys = Array.from(new Set(exclude));
+        break;
+      }
       case 'count':
         this.doCount = true;
         break;
@@ -184,6 +192,9 @@ RestQuery.prototype.execute = function(executeOptions) {
     .then(() => {
       return this.handleIncludeAll();
     })
+    .then(() => {
+      return this.handleExcludeKeys();
+    })
     .then(() => {
       return this.runFind(executeOptions);
     })
@@ -705,6 +716,24 @@ RestQuery.prototype.handleIncludeAll = function() {
     });
 };
 
+// Updates property `this.keys` to contain all keys but the ones unselected.
+RestQuery.prototype.handleExcludeKeys = function() {
+  if (!this.excludeKeys) {
+    return;
+  }
+  if (this.keys) {
+    this.keys = this.keys.filter(k => !this.excludeKeys.includes(k));
+    return;
+  }
+  return this.config.database
+    .loadSchema()
+    .then(schemaController => schemaController.getOneSchema(this.className))
+    .then(schema => {
+      const fields = Object.keys(schema.fields);
+      this.keys = fields.filter(k => !this.excludeKeys.includes(k));
+    });
+};
+
 // Augments this.response with data at the paths provided in this.include.
 RestQuery.prototype.handleInclude = function() {
   if (this.include.length == 0) {