I tried to make a DB structure for voting system using sequelize like below:

```js
PollAnswer = sequelize.define('PollAnswer', {answer: DataTypes.STRING});
PollQuestion = sequelize.define('PollQuestion', {question: DataTypes.STRING});
VotingHistory = sequelize.define('VotingHistory', {});
User = sequelize.define('User', {name: DataTypes.STRING});

PollAnswer.belongsTo(PollQuestion); //every question has many answers
VotingHistory.belongsTo(PollQuestion);
VotingHistory.belongsTo(PollAnswer);
VotingHistory.belongsTo(User);

```

I want to write a query to receive the **answers of a specific question and their vote counts in VotingHistory table**, I did it using folowing sql command and response was what I expected:

```sql
select count(VotingHistory.PollAnswerId), PollAnswer.answer from PollAnswers
left join VotingHistories on PollAnswer.id = VotingHistory.PollAnswerId group by PollAnswers.id

```

expected response:

```
answer    count
------------
ans1       10
ass2       2
ans3       0

```

But when using sequelize to query the same thing like below:

```js
VotingHistory.findAll({
  where:{PollQuestionId: req.params.poll},
  attributes:[[sequelize.fn('count', sequelize.col('PollAnswerId')), 'count']],
  group:['PollAnswerId'],
  include:[{
    model:PollAnswer,
    attributes:['id','answer']
  }]
})

```

it just returns this:

```
answer    count
------------
ans1       10
ass2       2

```

my question is:
how can I get the expected response that **above sql command query** returns, using sequelize?