Get a flatten JSON from an various Sails.js models associations - sails.js

Question

I have this hierarchy structure: Person < has a > Team < has a > Department
and I want to extract the flatten record from a person like this:
{
"name": "Foo",
"id": 1,
...
"team": {
"name": "MGMT",
"id": 1,
"department": 1
...
},
"department": {
"name": "Top",
"id": 1,
"office": 1
...
}
}
These are the models:
PERSON
// A person that belongs to a team
module.exports = {
attributes: {
name: {
type: 'string',
required: true
},
//Assosiations
team: {
model: 'team'
},
department: {
model: 'department',
via: 'team.department'
},
}
};
TEAM
// A team with many persons and belongs to one department
module.exports = {
attributes: {
name: {
type: 'string',
required: true
},
//Associations
department: {
model: 'department'
},
members: {
collection: 'person',
via: 'team'
}
}
};
DEPARTMENT
// A department that has many teams
module.exports = {
attributes: {
name: {
type: 'string',
required: true
},
teams: {
collection: 'team',
via: 'department'
}
}
};
I'm can't do it like this (yes, it has more levels):
function (req, res) {
Person.findById(1).exec(function (err, people) {
Team.findById(people[0].team).exec(function (err, teams) {
Department.findById(teams[0].department).exec(function (err, departments) {
Office.findById(departments[0].office).exec(function (err, offices) {
Company.findById(offices[0].company).exec(function (err, companies) {
var composeRecord = Object.assign(
people[0], {
team: teams[0],
department: departments[0],
office: offices[0],
company: companies[0],
});
res.send(composeRecord);
})
})
})
})
})
}
Any ideas how to do it better?

Answer 1

If you are using Mongo, you can do it using promises. It will look much better
var composeRecord
Person.findById(1).then(function(people){
composeRecord = people[0]
return Team.findById(people[0].team)
}).then(function (teams) {
composeRecord.team = teams[0]
return Department.findById(teams[0].department)
}).then(function(departments){
composeRecord.department = departments[0]
return Office.findById(departments[0].office)
}).then(function(offices){
composeRecord.office = offices[0]
return Company.findById(offices[0].company)
}).then(function(companies){
composeRecord.company = companies[0]
res.json(composeRecord)
}).catch(function (err) {
console.log(err)
})
If you are using reletional db like MySQL o PG you should write a query