I'm trying to figure out how to create a slice I can more easily manipulate and use JUST the values from to later iterate over to make a number of API requests. The slice of integers are API IDs. I am successfully making a struct with custom types after making a GET to retrieve the JSON Array of IDs, but I now need to pull only the values from that JSON array and dump them into a slice without the key "id" (which will likely need to change over time in size).
This is my JSON:
{
"data": [
{
"id": 38926
},
{
"id": 38927
}
],
"meta": {
"pagination": {
"total": 163795,
"current_page": 3,
"total_pages": 81898
}
}
}
And I would like this from it:
{38926, 38927}
CodePudding user response:
If you want custom Unmarshaling behavior, you need a custom type with its own json.Unmarshaler
e.g.
type ID int
func (i *ID) UnmarshalJSON(data []byte) error {
id := struct {
ID int `json:"id"`
}{}
err := json.Unmarshal(data, &id)
if err != nil {
return err
}
*i = ID(id.ID)
return nil
}
To use this, reference this type in your struct e.g.
type data struct {
IDs []ID `json:"data"`
}
var d data
working example: https://go.dev/play/p/i3MAy85nr4X