PG: Add dates to group aggregate

spec/ParseQuery.Aggregate.spec.js

@@ -96,6 +96,89 @@ describe('Parse.Query Aggregate testing', () => {
       }).catch(done.fail);
   });
 
+  it('group by empty object', (done) => {
+    const obj = new TestObject();
+    const pipeline = [{
+      group: { objectId: {} }
+    }];
+    obj.save().then(() => {
+      const query = new Parse.Query(TestObject);
+      return query.aggregate(pipeline);
+    }).then((results) => {
+      expect(results[0].objectId).toEqual(null);
+      done();
+    });
+  });
+
+  it('group by empty string', (done) => {
+    const obj = new TestObject();
+    const pipeline = [{
+      group: { objectId: '' }
+    }];
+    obj.save().then(() => {
+      const query = new Parse.Query(TestObject);
+      return query.aggregate(pipeline);
+    }).then((results) => {
+      expect(results[0].objectId).toEqual(null);
+      done();
+    });
+  });
+
+  it('group by empty array', (done) => {
+    const obj = new TestObject();
+    const pipeline = [{
+      group: { objectId: [] }
+    }];
+    obj.save().then(() => {
+      const query = new Parse.Query(TestObject);
+      return query.aggregate(pipeline);
+    }).then((results) => {
+      expect(results[0].objectId).toEqual(null);
+      done();
+    });
+  });
+
+  it('group by date object', (done) => {
+    const obj1 = new TestObject();
+    const obj2 = new TestObject();
+    const obj3 = new TestObject();
+    const pipeline = [{
+      group: {
+        objectId: { day: { $dayOfMonth: "$_updated_at" }, month: { $month: "$_created_at" }, year: { $year: "$_created_at" } },
+        count: { $sum: 1 }
+      }
+    }];
+    Parse.Object.saveAll([obj1, obj2, obj3]).then(() => {
+      const query = new Parse.Query(TestObject);
+      return query.aggregate(pipeline);
+    }).then((results) => {
+      const createdAt = new Date(obj1.createdAt);
+      expect(results[0].objectId.day).toEqual(createdAt.getUTCDate());
+      expect(results[0].objectId.month).toEqual(createdAt.getMonth() + 1);
+      expect(results[0].objectId.year).toEqual(createdAt.getUTCFullYear());
+      done();
+    });
+  });
+
+  it_exclude_dbs(['postgres'])('cannot group by date field (excluding createdAt and updatedAt)', (done) => {
+    const obj1 = new TestObject({ dateField: new Date(1990, 11, 1) });
+    const obj2 = new TestObject({ dateField: new Date(1990, 5, 1) });
+    const obj3 = new TestObject({ dateField: new Date(1990, 11, 1) });
+    const pipeline = [{
+      group: {
+        objectId: { day: { $dayOfMonth: "$dateField" }, month: { $month: "$dateField" }, year: { $year: "$dateField" } },
+        count: { $sum: 1 }
+      }
+    }];
+    Parse.Object.saveAll([obj1, obj2, obj3]).then(() => {
+      const query = new Parse.Query(TestObject);
+      return query.aggregate(pipeline);
+    }).then(done.fail).catch((error) => {
+      expect(error.code).toEqual(Parse.Error.INVALID_QUERY);
+      done();
+    });
+  });
+
   it('group by pointer', (done) => {
     const pointer1 = new TestObject();
     const pointer2 = new TestObject();

src/Adapters/Storage/Mongo/MongoStorageAdapter.js

@@ -526,7 +526,7 @@ export class MongoStorageAdapter implements StorageAdapter {
   aggregate(className: string, schema: any, pipeline: any, readPreference: ?string) {
     let isPointerField = false;
     pipeline = pipeline.map((stage) => {
-      if (stage.$group && stage.$group._id) {
+      if (stage.$group && stage.$group._id && (typeof stage.$group._id === 'string')) {
         const field = stage.$group._id.substring(1);
         if (schema.fields[field] && schema.fields[field].type === 'Pointer') {
           isPointerField = true;
@@ -552,12 +552,21 @@ export class MongoStorageAdapter implements StorageAdapter {
     readPreference = this._parseReadPreference(readPreference);
     return this._adaptiveCollection(className)
       .then(collection => collection.aggregate(pipeline, { readPreference, maxTimeMS: this._maxTimeMS }))
+      .catch(error => {
+        if (error.code === 16006) {
+          throw new Parse.Error(Parse.Error.INVALID_QUERY, error.message);
+        }
+        throw error;
+      })
       .then(results => {
         results.forEach(result => {
           if (result.hasOwnProperty('_id')) {
             if (isPointerField && result._id) {
               result._id = result._id.split('$')[1];
             }
+            if (result._id == null || _.isEmpty(result._id)) {
+              result._id = null;
+            }
             result.objectId = result._id;
             delete result._id;
           }

src/Adapters/Storage/Postgres/PostgresStorageAdapter.js

@@ -55,6 +55,21 @@ const ParseToPosgresComparator = {
   '$lte': '<='
 }
 
+const mongoAggregateToPostgres = {
+  $dayOfMonth: 'DAY',
+  $dayOfWeek: 'DOW',
+  $dayOfYear: 'DOY',
+  $isoDayOfWeek: 'ISODOW',
+  $isoWeekYear:'ISOYEAR',
+  $hour: 'HOUR',
+  $minute: 'MINUTE',
+  $second: 'SECOND',
+  $millisecond: 'MILLISECONDS',
+  $month: 'MONTH',
+  $week: 'WEEK',
+  $year: 'YEAR',
+};
+
 const toPostgresValue = value => {
   if (typeof value === 'object') {
     if (value.__type === 'Date') {
@@ -179,6 +194,15 @@ const transformDotField = (fieldName) => {
 }
 
 const transformAggregateField = (fieldName) => {
+  if (typeof fieldName !== 'string') {
+    return fieldName;
+  }
+  if (fieldName === '$_created_at') {
+    return 'createdAt';
+  }
+  if (fieldName === '$_updated_at') {
+    return 'updatedAt';
+  }
   return fieldName.substr(1);
 }
 
@@ -1519,6 +1543,7 @@ export class PostgresStorageAdapter implements StorageAdapter {
     let index = 2;
     let columns: string[] = [];
     let countField = null;
+    let groupValues = null;
     let wherePattern = '';
     let limitPattern = '';
     let skipPattern = '';
@@ -1532,13 +1557,33 @@ export class PostgresStorageAdapter implements StorageAdapter {
           if (value === null || value === undefined) {
             continue;
           }
-          if (field === '_id') {
+          if (field === '_id' && (typeof value === 'string') && value !== '') {
             columns.push(`$${index}:name AS "objectId"`);
             groupPattern = `GROUP BY $${index}:name`;
             values.push(transformAggregateField(value));
             index += 1;
             continue;
           }
+          if (field === '_id' && (typeof value === 'object') && Object.keys(value).length !== 0) {
+            groupValues = value;
+            const groupByFields = [];
+            for (const alias in value) {
+              const operation = Object.keys(value[alias])[0];
+              const source = transformAggregateField(value[alias][operation]);
+              if (mongoAggregateToPostgres[operation]) {
+                if (!groupByFields.includes(`"${source}"`)) {
+                  groupByFields.push(`"${source}"`);
+                }
+                columns.push(`EXTRACT(${mongoAggregateToPostgres[operation]} FROM $${index}:name AT TIME ZONE 'UTC') AS $${index + 1}:name`);
+                values.push(source, alias);
+                index += 2;
+              }
+            }
+            groupPattern = `GROUP BY $${index}:raw`;
+            values.push(groupByFields.join());
+            index += 1;
+            continue;
+          }
           if (value.$sum) {
             if (typeof value.$sum === 'string') {
               columns.push(`SUM($${index}:name) AS $${index + 1}:name`);
@@ -1646,13 +1691,20 @@ export class PostgresStorageAdapter implements StorageAdapter {
     debug(qs, values);
     return this._client.map(qs, values, a => this.postgresObjectToParseObject(className, a, schema))
       .then(results => {
-        if (countField) {
-          results[0][countField] = parseInt(results[0][countField], 10);
-        }
         results.forEach(result => {
           if (!result.hasOwnProperty('objectId')) {
             result.objectId = null;
           }
+          if (groupValues) {
+            result.objectId = {};
+            for (const key in groupValues) {
+              result.objectId[key] = result[key];
+              delete result[key];
+            }
+          }
+          if (countField) {
+            result[countField] = parseInt(result[countField], 10);
+          }
         });
         return results;
       });