Unmarshalling JSON with Duplicate Fields - json

Question

I'm still learning the go language, but I've been trying to find some practical things to work on to get a better handle on it. Currently, I'm trying to build a simple program that goes to a youtube channel and returns some information by taking the public JSON and unmarshalling it.
Thus far I've tried making a completely custom struct that only has a few fields in it, but that doesn't seem to pull in any values. I've also tried using tools like https://mholt.github.io/json-to-go/ and getting the "real" struct that way. The issue with that method is there are numerous duplicates and I don't know enough to really assess how to tackle that.
This is an example JSON (I apologize for its size) https://pastebin.com/6u0b39tU
This is the struct that I get from the above tool: https://pastebin.com/3ZCu96st
the basic pattern of code I've tried is:
jsonFile, err := os.Open("test.json")
if err != nil {
fmt.Println("Couldn't open file", err)
}
defer jsonFile.Close()
bytes, _ := ioutil.ReadAll(jsonFile)
var channel Autogenerated
json.Unmarshal(bytes, &Autogenerated)
if err != nil {
fmt.Println("Failed to Unmarshal", err)
}
fmt.Println(channel.Fieldname)
Any feedback on the correct approach for how to handle something like this would be great. I get the feeling I'm just completely missing something.

Answer 1

In your code, you are not unmarshaling into the channel variable. Furthermore, you can optimize your code to not use ReadAll. Also, don't forget to check for errors (all errors).
Here is an improvement to your code.
jsonFile, err := os.Open("test.json")
if err != nil {
log.Fatalf("could not open file: %v", err)
}
defer jsonFile.Close()
var channel Autogenerated
if err := json.NewDecoder(jsonFile).Decode(&channel); err != nil {
log.Fatalf("failed to parse json: %v", err)
}
fmt.Println(channel.Fieldname)
Notice how a reference to channel is passed to Decode.