CODEWITHSUNDEEP
jsongo
Luman75
Luman75

Reputation: 918

Complex JSON marshaling to GoLang objects

I need to marshal complex JSON object to GO structure.

So I have source:

"NetworkSettings": {
        "Bridge": "",
        "SandboxID": "e9736755bc41db307019fde3be0feed51086e6d3e23b0213c59bb5e43f7af214",
        "HairpinMode": false,
        "SecondaryIPAddresses": null,
        "SecondaryIPv6Addresses": null,
        "EndpointID": "2ee283787f45894c3383229d29ada1ccbb7f34b1c1e143e417e7ba75b7f5ebce",
        "Gateway": "172.17.0.1",
        "IPAddress": "172.17.0.2",
        "IPPrefixLen": 16,
        "IPv6Gateway": "",
        "MacAddress": "02:42:ac:11:00:02",
        "Networks": {
            "bridge": {
                "IPAMConfig": null,
                "Links": null,
                "Aliases": null,
                "NetworkID": "1c4788fac19973ddc73975613a2aef5a4cc2be446af458c06fa5fa162e8126ff",
                "EndpointID": "2ee283787f45894c3383229d29ada1ccbb7f34b1c1e143e417e7ba75b7f5ebce",
                "Gateway": "172.17.0.1",
                "IPAddress": "172.17.0.2",
                "IPPrefixLen": 16,
                "IPv6Gateway": "",
                "GlobalIPv6Address": "",
                "GlobalIPv6PrefixLen": 0,
                "MacAddress": "02:42:ac:11:00:02"
            }
        }

and I need to map it into object like this:

NetworkSettings struct {
    IpAddress string
    SandboxID string
    Gateway string
    Ports     map[string][]Binding
    Networks map[string]map[string]string
}

However because of Networks map[string]map[string]string I'm getting error 

json: cannot unmarshal object into Go value of type string
error restoring containers: json: cannot unmarshal object into Go value of type string

But this is what I need to have a complex map of map structure.

Any idea how to do that?

Upvotes: 1

Views: 553

Answers (1)

AlexT
AlexT

Reputation: 696

That error happens because some of the values in the JSON aren't strings, but are integers (IPPrefixLen for example), and therefore can't be assigned to a string variable.

There are 2 ways to address this. You could use the interface{} type, so your type definition would become:

NetworkSettings struct {
    IpAddress string
    SandboxID string
    Gateway   string
    Ports     map[string][]Binding
    Networks  map[string]map[string]interface{}
}

A better solution would probably be to define a type for the Network block:

type Network struct {
    NetworkID   string 
    EndpointID  string
    Gateway     string
    IPAddress   string
    IPPrefixLen int
    //etc...
}
type NetworkSettings struct {
    IpAddress string
    SandboxID string
    Gateway   string
    Ports     map[string][]Binding
    Networks  map[string]Network
}

Upvotes: 9

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