I’ve searched quite a bit for my specific use case but haven’t a solution, so I thought I’d ask. I’m learning Go at the moment, creating a module. But having trouble unmarshaling a json file into a struct. The contents of the json file are to be used as settings for the Asynq server since they might change and I don’t want to hardcode them.

The specific issue is that after reading the file and unmarshaling it, the content returns empty, or zero for int fields. Seems like I’m missing a step, perhaps, do a range through, but I can’t pinpoint it. Below is what I’m doing:

The struct:

type AsynqQueues struct {
Name        string `json:"name"`
Priority    int    `json:"priority"`
Concurrency int    `json:"concurrency"`

}

The contents of the json file, which I got from filePath:

{
“queues”: [
{
“name”: “critical”,
“priority”: 6
},
{
“name”: “default”,
“priority”: 3
},
{
“name”: “low”,
“priority”: 1
},
{
“concurrency”: 10
}
]
}

The function (I’m returning nil for now to be able to test that part of the code):

func MyAsynqServer(filePath string) *asynq.Server {
var settings AsynqQueues

file, err := os.ReadFile(filePath)
if err != nil {
    fmt.Println("Error reading file:", err)
    return nil
}

err = json.Unmarshal(file, &settings)
if err != nil {
    fmt.Println("Error unmarshalling JSON:", err)
    return nil
}

fmt.Printf("Name: %s, Priority: %d, Concurrency: %dn", settings.Name, settings.Priority, settings.Concurrency)
return nil

Since the json is an array of objects, I also tried creating another struct as below then calling the AsynqQueues struct from it. But in either case I get empty back:

type Queues struct {
AQueues AsynqQueues

}