Get only dataValues from sequelize raw query instead of Model instance - database

Question

I'm using sequelize and using raw query to get the datas from table. But I'm getting all of the model instances while I only need the dataValues.
My setup looks like this:
const sequelize = new Sequelize({
database: process.env.PGDATABASE,
username: process.env.PGUSER,
password: process.env.PGPASS,
host: process.env.PGHOST,
port: process.env.PGPORT,
dialect: "postgres"
});
getPostGres: () => {
return sequelize;
}
and the way I'm querying the database looks like this:
let messageRatingsArr = await getPostGres().query(
`SELECT mr.support_email, mr.support_name,
(select count(mrn."chatId") as total FROM message_ratings as mrn WHERE mrn."ratingType"='NEGATIVE' and mr.support_email = mrn.support_email) as negative,
(select count(mrp."chatId") as total FROM message_ratings as mrp WHERE mrp."ratingType"='POSITIVE' and mr.support_email = mrp.support_email) as positive,
(select count(mrm."chatId") as total FROM message_ratings as mrm WHERE mrm."ratingType"='MIXED' and mr.support_email = mrm.support_email) as mixed,
(select count(mru."chatId") as total FROM message_ratings as mru WHERE mru."ratingType"='NEUTRAL' and mr.support_email = mru.support_email) as neutral
FROM message_ratings mr
WHERE mr."createdAt" >= '${properFromDate}' AND mr."createdAt" <= '${properToDate}'
group by mr.support_email, mr.support_name
limit ${args.count} offset ${args.offset} `,
{
model: MessageRatingPG,
mapToModel: true
}
);
let messageRatings = messageRatingsArr.map(item=>{
return item.dataValues;
})
let result = connectionFromArray(messageRatings, args);
result.totalCount = messageRatings.length;
return result;
As you can see, since I'm mapping the data from the query which has all kinds of stuff like dataValues, _options, isNewRecord etc., looping through the array if I have a large data set isn't efficient, so what can I do to only get the dataValues?

Answer 1

From https://sequelize.org/master/manual/raw-queries.html:
In cases where you don't need to access the metadata you can pass in a query type to tell sequelize how to format the results. For example, for a simple select query you could do:
sequelize.query("SELECT * FROM `users`", { type: sequelize.QueryTypes.SELECT})
.then(users => {
// We don't need spread here, since only the results will be returned for select queries
})
Now, looking at your code, and comparing with the next paragraph in the docs:
A second option is the model. If you pass a model the returned data will be instances of that model.
// Callee is the model definition. This allows you to easily map a query to a predefined model
sequelize
.query('SELECT * FROM projects', {
model: Projects,
mapToModel: true // pass true here if you have any mapped fields
})
.then(projects => {
// Each record will now be an instance of Project
})
I'd suggest removing from your original code, the following:
{
model: MessageRatingPG,
mapToModel: true
}
and replacing it with { type: sequelize.QueryTypes.SELECT }

Answer 2

You have to add to your query the attribute raw. From the docs
Sometimes you might be expecting a massive dataset that you just want
to display, without manipulation. For each row you select, Sequelize
creates an instance with functions for update, delete, get
associations etc. If you have thousands of rows, this might take some
time. If you only need the raw data and don't want to update anything,
you can do like this to get the raw data.
Project.findAll({ where: { ... }, raw: true })