Extracting properties and meta-properties into JSON-like structure with Gremlin - gremlin

Question

My customer vertex has 4 properties and 2 meta-properties (each containing a list). The task is to return the customer data in a JSON structure. I was able to come up with this query:
g.V('customerId')
.project('customer', 'addresses', 'accounts')
.by(properties().not(hasLabel('addresses', 'accounts')).group().by(key()).by(value()))
.by(properties('addresses').valueMap().fold())
.by(properties('accounts').valueMap().fold())
which produces result
{
"customer": {
"firstName": "Carl",
"middleName": "Friedrich",
"lastName": "Gauss",
"age": 77
},
"addresses": [
{
"streetName": "View",
"streetNumber": "43",
},
{
"streetName": "Market",
"streetNumber": "11",
}
],
"accounts": [
{
"accountNumber": "1234"
},
{
"accountNumber": "4321"
}
]
}
What I actually need is a structure like this:
{
"firstName": "Carl",
"middleName": "Friedrich",
"lastName": "Gauss",
"age": 77,
"addresses": [
{
"streetName": "View",
"streetNumber": "43",
},
{
"streetName": "Market",
"streetNumber": "11",
}
],
"accounts": [
{
"accountNumber": "1234"
},
{
"accountNumber": "4321"
}
]
}
The closest I was able to get is this query:
g.V('customerId')
.properties()
.group()
.by(key)
.by(choose(hasLabel('addresses','accounts'), valueMap().fold(), value()))
which unfortunatelly groups address and account content so I can actually see only the last address/account:
{
"firstName": "Carl",
"middleName": "Friedrich",
"lastName": "Gauss",
"age": 77,
"addresses": [
{
"streetName": "Market",
"streetNumber": "11",
}
],
"accounts": [
{
"accountNumber": "4321"
}
]
}
Is there a way to list all the meta-properties elements?

Answer 1

For the example above,
If you add fold().unfold() it will take into account all the properties:
g.V('c81e3753-1eaa-453b-85bc-818174de70c1')
.properties()
.group()
.by(key)
.by(fold().unfold().choose(hasLabel('addresses','accounts'), value().fold(), value()))