Schema format cleanup

src/Adapters/Storage/Mongo/MongoSchemaCollection.js

@@ -115,9 +115,20 @@ class MongoSchemaCollection {
     });
   }
 
+  // Add a collection. Currently the input is in mongo format, but that will change to Parse format in a
+  // later PR. Returns a promise that is expected to resolve with the newly created schema, in Parse format.
+  // If the class already exists, returns a promise that rejects with undefined as the reason. If the collection
+  // can't be added for a reason other than it already existing, requirements for rejection reason are TBD.
   addSchema(name: string, fields) {
     let mongoObject = _mongoSchemaObjectFromNameFields(name, fields);
-    return this._collection.insertOne(mongoObject);
+    return this._collection.insertOne(mongoObject)
+    .then(result => mongoSchemaToParseSchema(result.ops[0]))
+    .catch(error => {
+      if (error.code === 11000) { //Mongo's duplicate key error
+        return Promise.reject();
+      }
+      return Promise.reject(error);
+    });
   }
 
   updateSchema(name: string, update) {

src/Schema.js

@@ -132,17 +132,16 @@ function validateCLP(perms) {
     });
   });
 }
-// Valid classes must:
-// Be one of _User, _Installation, _Role, _Session OR
-// Be a join table OR
-// Include only alpha-numeric and underscores, and not start with an underscore or number
 var joinClassRegex = /^_Join:[A-Za-z0-9_]+:[A-Za-z0-9_]+/;
 var classAndFieldRegex = /^[A-Za-z][A-Za-z0-9_]*$/;
 function classNameIsValid(className) {
-  return (systemClasses.indexOf(className) > -1 ||
-    className === '_SCHEMA' || //TODO: remove this, as _SCHEMA is not a valid class name for storing Parse Objects.
+  // Valid classes must:
+  return (
+    // Be one of _User, _Installation, _Role, _Session OR
+    systemClasses.indexOf(className) > -1 ||
+    // Be a join table OR
     joinClassRegex.test(className) ||
-    //Class names have the same constraints as field names, but also allow the previous additional names.
+    // Include only alpha-numeric and underscores, and not start with an underscore or number
     fieldNameIsValid(className)
   );
 }
@@ -272,14 +271,13 @@ class Schema {
     }
 
     return this._collection.addSchema(className, mongoObject.result)
-      //TODO: Move this logic into the database adapter
-      .then(result => MongoSchemaCollection._TESTmongoSchemaToParseSchema(result.ops[0]))
-      .catch(error => {
-        if (error.code === 11000) { //Mongo's duplicate key error
-          throw new Parse.Error(Parse.Error.INVALID_CLASS_NAME, `Class ${className} already exists.`);
-        }
-        return Promise.reject(error);
-      });
+    .catch(error => {
+      if (error === undefined) {
+        throw new Parse.Error(Parse.Error.INVALID_CLASS_NAME, `Class ${className} already exists.`);
+      } else {
+        throw new Parse.Error(Parse.Error.INTERNAL_SERVER_ERROR, 'Database adapter error.');
+      }
+    });
   }
 
   updateClass(className, submittedFields, classLevelPermissions, database) {