fix(count): duplicate mapping of fields break scopes (#9821)

lib/model.js

@@ -1850,8 +1850,6 @@ class Model {
         col = this.name + '.' + (options.col || this.primaryKeyField);
       }
 
-      Utils.mapOptionFieldNames(options, this);
-
       options.plain = !options.group;
       options.dataType = new DataTypes.INTEGER();
       options.includeIgnoreAttributes = false;

test/integration/model/scope/count.test.js

@@ -16,6 +16,10 @@ describe(Support.getTestDialectTeaser('Model'), () => {
         this.ScopeMe = this.sequelize.define('ScopeMe', {
           username: Sequelize.STRING,
           email: Sequelize.STRING,
+          aliasValue: {
+            field: 'alias_value',
+            type: Sequelize.INTEGER
+          },
           access_level: Sequelize.INTEGER,
           other_value: Sequelize.INTEGER
         }, {
@@ -65,7 +69,12 @@ describe(Support.getTestDialectTeaser('Model'), () => {
                   }
                 }]
               };
-            }
+            },
+            withAliasedField: {
+              where: {
+                aliasValue: { [Sequelize.Op.ne]: 1 }
+              }
+            },
           }
         });
         this.Child.belongsTo(this.ScopeMe);
@@ -73,10 +82,10 @@ describe(Support.getTestDialectTeaser('Model'), () => {
 
         return this.sequelize.sync({force: true}).then(() => {
           const records = [
-            {username: 'tony', email: 'tony@sequelizejs.com', access_level: 3, other_value: 7},
-            {username: 'tobi', email: 'tobi@fakeemail.com', access_level: 10, other_value: 11},
-            {username: 'dan', email: 'dan@sequelizejs.com', access_level: 5, other_value: 10},
-            {username: 'fred', email: 'fred@foobar.com', access_level: 3, other_value: 7}
+            {username: 'tony', email: 'tony@sequelizejs.com', access_level: 3, other_value: 7, aliasValue: 12 },
+            {username: 'tobi', email: 'tobi@fakeemail.com', access_level: 10, other_value: 11, aliasValue: 5 },
+            {username: 'dan', email: 'dan@sequelizejs.com', access_level: 5, other_value: 10, aliasValue: 1 },
+            {username: 'fred', email: 'fred@foobar.com', access_level: 3, other_value: 7, aliasValue: 10 }
           ];
           return this.ScopeMe.bulkCreate(records);
         }).then(() => {
@@ -113,6 +122,10 @@ describe(Support.getTestDialectTeaser('Model'), () => {
         return expect(this.ScopeMe.scope('lowAccess').count({ where: { username: 'dan'}})).to.eventually.equal(1);
       });
 
+      it('should be able to merge scopes with where on aliased fields', function() {
+        return expect(this.ScopeMe.scope('withAliasedField').count({ where: { aliasValue: 5 } })).to.eventually.equal(1);
+      });
+
       it('should ignore the order option if it is found within the scope', function() {
         return expect(this.ScopeMe.scope('withOrder').count()).to.eventually.equal(4);
       });