React final forms how to add child forms - reactjs

Question

Have the sandbox with working React forms array
https://codesandbox.io/s/react-final-form-field-arrays-react-beatiful-dnd-as-drag-drop-forked-uz24z?file=/index.js:5933-6061
Which in result of click on the add hotspots and generate the data tree as
{
"toppings":[
],
"customers":[
{
"id":4,
"firstName":"name",
"lastName":"lastname"
},
{
"id":5,
"firstName":"Clark",
"lastName":"kent"
}
],
"hotspots":[
{
"hotspotId":6,
"positionY":"Xhostspotforcustomer1",
"positionX":"Yhostspotforcustomer1"
}
]
}
But I need hotspots to be added as children of customer when click on the Add Hotspot button (to same index of the values.customers array) like
{
"toppings":[
],
"customers":[
{
"id":4,
"firstName":"name",
"lastName":"lastname",
"hotspots":[
{
"hotspotId":6,
"positionY":"XhostspotforcustomerID4",
"positionX":"YhostspotforcustomerID4"
},
{
"hotspotId":7,
"positionY":"more XhostspotforcustomerID4",
"positionX":"new YhostspotforcustomerID4"
}
]
},
{
"id":5,
"firstName":"Clark",
"lastName":"kent",
"hotspots":[
{
"hotspotId":8,
"positionY":"XhostspotforcustomerID5",
"positionX":"YhostspotforcustomerID5"
}
]
}
],
}
The Add hotspot is added on line 174 of index.js
How to modify the code to add hotspots per customer separately ?

Answer 1

you need to combine customer field name with hotspot name:
when you do push/pop:
push(`${name}.hotspots`, /*...*/)
//...
pop(`${name}.hotspots`)
also in FieldArray field name:
<FieldArray name={`${name}.hotspots`}>
Demo: https://codesandbox.io/s/react-final-form-field-arrays-react-beatiful-dnd-as-drag-drop-forked-wivwu?file=/index.js
Result:
{
"toppings": [],
"customers": [
{
"id": 4,
"firstName": "name",
"lastName": "lastname",
"hotspots": [
{
"hotspotId": 6,
"positionY": "Customer4-Y1",
"positionX": "Customer4-X1"
},
{
"hotspotId": 7,
"positionY": "Customer4-Y2",
"positionX": "Customer4-X2"
}
]
},
{
"id": 5,
"firstName": "Clark",
"lastName": "kent",
"hotspots": [
{
"hotspotId": 8,
"positionY": "Customer5-Y1",
"positionX": "Customer5-X1"
}
]
}
]
}