How to unmarshal a json field if it can take a different type?

Question

go

I use structure

type CustomColumn struct {
  ColName     string          `json:"ColName"`
  Description string          `json:"Description"`
  Type        string          `json:"Type"`
  Value       interface{}     `json:"Value"`
}

This structure is normally marshaled into a json file. The Value field can be of type sql.NullFloat64 sql.NullInt64 or NullTime.
How to properly unmarshal the received json?
PS I use a json file to store settings and results of work for re-launch.

Answer 1

In the same way, unmarshalling, you just have to pull the value from interface{} into the desired type.
https://tour.golang.org/methods/16
all numbers from Json are converted to float64 when unmarshaled in interface{}. If you need an int, you will have to turn it into an int later, after pulling it out of interface{}

Answer 2

He wrote everything to you.
Run apt-get updateit and see what errors there are, or the GPG signature fails verification somewhere or the repository
returns 404