Grouping Response Data - api

Question

I am trying to get data from my database but when I show and make it become api response, I have some problem for grouping it based on productid.
I have response data that created based on golang like this:
[
{
"product_id": "1",
"product_name": "Cardigan",
"pitems": [
{
"id": "625ad1bc-66c5-440e-a527-d029d401ec2b",
"name": "Box",
"qty": 1
},
{
"id": "625ad1bc-66c6-440e-a527-d029d401ec2b",
"name": "test items1",
"qty": 1
},
{
"id": "625ad1bc-66c7-440e-a527-d029d401ec2b",
"name": "test items2",
"qty": 1
},
{
"id": "625ad1bc-66c8-440e-a527-d029d401ec2b",
"name": "test items3",
"qty": 1
}
]
},
{
"product_id": "2",
"product_name": "Polo",
"product_sku": "P01",
"items": [
{
"id": "625ad1bc-66c5-440e-a527-d029d401ec2b",
"name": "Box",
"qty": 1
},
{
"id": "625ad1bc-66c6-440e-a527-d029d401ec2b",
"name": "test items1",
"qty": 1
},
{
"id": "625ad1bc-66c7-440e-a527-d029d401ec2b",
"name": "test items2",
"qty": 1
},
{
"id": "625ad1bc-66c8-440e-a527-d029d401ec2b",
"name": "test items3",
"qty": 1
}
]
}
]
But This response is not my expected result, my expected result is like:
[
{
"product_id": "1",
"product_name": "Cardigan",
"pitems": [
{
"id": "625ad1bc-66c5-440e-a527-d029d401ec2b",
"name": "Box",
"qty": 1
},
{
"id": "625ad1bc-66c6-440e-a527-d029d401ec2b",
"name": "test items1",
"qty": 1
},
{
"id": "625ad1bc-66c7-440e-a527-d029d401ec2b",
"name": "test items2",
"qty": 1
}
]
},
{
"product_id": "2",
"product_name": "Polo",
"product_sku": "P01",
"items": [
{
"id": "625ad1bc-66c8-440e-a527-d029d401ec2b",
"name": "test items3",
"qty": 1
}
]
}
]
Can Anyone help me to solve my problem?

Answer 1

What does it mean to show detailed data?
the easy way is:
create 2 func like this:
func detail(id int)(result model.Struct)
{ return result }
func product()(result model.Struct_Result) {
for data.Next() {
// call func detail
data.Scan(&id, &product)
detailResult := detail(id)
// then put together with struct and mix append ()
outputLoop := model.Result{
"product_id": id,
"pitems": [
{
"id": detailResult.id,
"name": detailResult.name,
"qty": detailResult.qty
},
]
}
result = append(result,outputLoop)
}
return result
}