Calculated Fields with nestTables Option for MySQL Query in NodeJS - json

Question

I'm using the 'nestTables' option in the code below to separate the data returned from an SQL query into their respective tables. I am also including a calculated field in my query that I would like to include in the primary table.
As an example, I am executing the following route:
router.route('/person/:personId').get(function(req,res){
var person_id = req.params.personId;
db.getConnection(function(err, connection) {
if (err) {
return res.status(503).send({ result: false, error: 'CONNECTION error: ' + err.code});
} else {
var sqlString='SELECT *, someField - 1 as calculated FROM person LEFT JOIN person_status ON person.id = person_status.person_id WHERE person.id = ' + person_id;
var options={sql:sqlString,nestTables:true};
connection.query(options, function(error, rows, fields) {
connection.release();
var nestingOptions = [
{tableName: 'person', pkey:'id'},
{tableName: 'person_status', pkey:'id', fkeys:[{table:'person',col:'person_id'}]}
];
if (error) {
return res.status(500).send({ result: false, error: 'QUERY ERROR: ' + error.code});
} else {
return res.status(200).send(rows);
}
});
}
});
});
and I am receiving the following JSON Response:
[
{
"person": {
"id": 1,
other person data . . .
"person_status": [
{
"id": 3,
other data . . .
}
]
},
"person_status": {
"id": 3,
other data . . .
},
"": {
"calculated": 0
}
}
]
Ideally, I would like to include the calculated field into the person subgroup as shown below:
[
{
"person": {
"id": 1,
"calculated": 0
other person data . . .
"person_status": [
{
"id": 3,
other data . . .
}
]
},
"person_status": {
"id": 3,
other data . . .
}
}
]
Is there any way that I can include the calculated field into the person table, or is there a better solution that fits this problem?
Thanks in advance!

Answer 1

I see two options to solve this, one dirty way using SQL:
var sqlString = 'SELECT *, someField - 1 as calculated FROM person WHERE person.id=?';
sqlString = 'SELECT * FROM (' + sqlString + ') as person';
sqlString += ' LEFT JOIN person_status ON person.id = person_status.person_id';
var options={sql:sqlString, nestTables:true};
connection.query(options, [person_id], function(error, rows, fields) {
and the obvious solution using js:
var sqlString = 'SELECT *, someField - 1 as calculated FROM person LEFT JOIN person_status ON person.id = person_status.person_id WHERE person.id=?';
var options = {sql:sqlString, nestTables:true};
connection.query(options, [person_id], function(error, rows, fields) {
rows.forEach(function(row) {
row.person.calculated = row[''].calculated;
delete row[''];
});
I don't think there is a more pleasant solution for this. I even checked if there is a possibility to trick the FieldPacket or RowDataPacket parser but didn't see a way to fake a table name (without monkey patching the mysql driver).