Complex JSON marshaling to GoLang objects

Question

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?

AlexT · Accepted Answer · 2016-07-14 11:24:26Z

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 }

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