fix(model): support custom fields in aggregate methods, closes #4935

changelog.md

+# Next]
+- [FIXED] Model.aggregate methods now support attributes and where conditions with fields. [#4935](https://github.com/sequelize/sequelize/issues/4935)
+
 # 3.14.1
 - [FIXED] Issue with transaction options leaking and certain queries running outside of the transaction connection.
 

lib/model.js

@@ -1504,20 +1504,23 @@ Model.prototype.find = Model.prototype.findOne;
  *
  * @return {Promise<options.dataType|object>}                Returns the aggregate result cast to `options.dataType`, unless `options.plain` is false, in which case the complete data result is returned.
  */
-Model.prototype.aggregate = function(field, aggregateFunction, options) {
+Model.prototype.aggregate = function(attribute, aggregateFunction, options) {
   options = Utils._.extend({ attributes: [] }, options || {});
   conformOptions(options, this);
   Model.$injectScope(this.$scope, options);
 
-  var aggregateColumn = this.sequelize.col(field);
+  var attrOptions = this.rawAttributes[attribute]
+    , field = attrOptions && attrOptions.field || attribute
+    , aggregateColumn = this.sequelize.col(field);
+
   if (options.distinct) {
     aggregateColumn = this.sequelize.fn('DISTINCT', aggregateColumn);
   }
   options.attributes.push([this.sequelize.fn(aggregateFunction, aggregateColumn), aggregateFunction]);
 
   if (!options.dataType) {
-    if (this.rawAttributes[field]) {
-      options.dataType = this.rawAttributes[field].type;
+    if (attrOptions) {
+      options.dataType = attrOptions.type;
     } else {
       // Use FLOAT as fallback
       options.dataType = new DataTypes.FLOAT();
@@ -1526,6 +1529,7 @@ Model.prototype.aggregate = function(field, aggregateFunction, options) {
     options.dataType = this.sequelize.normalizeDataType(options.dataType);
   }
 
+  Utils.mapOptionFieldNames(options, this);
   options = paranoidClause(this, options);
 
   return this.QueryInterface.rawSelect(this.getTableName(options), options, aggregateFunction, this);

test/integration/model.test.js

@@ -11,6 +11,7 @@ var chai = require('chai')
   , sinon = require('sinon')
   , _ = require('lodash')
   , moment = require('moment')
+  , Promise = require('bluebird')
   , current = Support.sequelize;
 
 describe(Support.getTestDialectTeaser('Model'), function() {
@@ -1997,9 +1998,23 @@ describe(Support.getTestDialectTeaser('Model'), function() {
         value: Sequelize.DECIMAL(10, 3)
       });
 
-      return this.UserWithAge.sync({ force: true }).then(function() {
-        return self.UserWithDec.sync({ force: true });
+      this.UserWithFields = this.sequelize.define('UserWithFields', {
+        age: {
+          type: Sequelize.INTEGER,
+          field: 'user_age'
+        },
+        order: Sequelize.INTEGER,
+        gender: {
+          type: Sequelize.ENUM('male', 'female'),
+          field: 'male_female'
+        }
       });
+
+      return Promise.join(
+        this.UserWithAge.sync({ force: true }),
+        this.UserWithDec.sync({ force: true }),
+        this.UserWithFields.sync({ force: true })
+      );
     });
 
     it('should return the sum of the values for a field named the same as an SQL reserved keyword', function() {
@@ -2040,6 +2055,19 @@ describe(Support.getTestDialectTeaser('Model'), function() {
       });
     });
 
+    it('should accept a where clause with custom fields', function() {
+      return this.UserWithFields.bulkCreate([
+        {age: 2, gender: 'male'},
+        {age: 3, gender: 'female'}
+      ], {
+        logging: console.log
+      }).bind(this).then(function() {
+        return expect(this.UserWithFields.sum('age', {
+          where: { 'gender': 'male' }
+        })).to.eventually.equal(2);
+      });
+    });
+
     it('allows sql logging', function() {
       var logged = false;
       return this.UserWithAge.sum('age', {