How to merge 2 structs

I am trying to modify some stuff in Go. I have the following struct I created

I have an API call returning something like this

MyStruct struct {
	DID              string `bson:"d_id" json:"d_id"`
	PID              string `bson:"p_id" json:"p_id"`
    ...
}

in one call in the code, I want to append a new key to that struct

like

myNewStruct {
		DID              string `bson:"d_id" json:"d_id"`
		PID              string `bson:"p_id" json:"p_id"`
        ...
        MyNewKey         string `bson:"new_key" json:"new_key"`
}

The thing is, I want to add a new key, and keep the rest at the root of the object, like the object above. without having to rewrite the full object structure, or doing a for loop of each key.

type MyNewStruct struct {
	*MyStruct
	MyNewKey MyValueType
}

I have, two variable with the data,

MyStructData and MyNewKeyData

I want to, but don t know how to merge those two data inside MyNewStruct so that everything in MyStructData will be at the root of the key, and everything in MyNewKeyData will be indise the key MyNewKey

I am trying stuff like

	theObjectIWant := MyNewStruct {
		MyStructData,
		"MyNewKey" : MyNewKeyData 
	}

but doesn't work

When you create an anonymous member in a struct, the compiler generates a name for the member that is named the same as the type. You can use this name when initializing the containing struct.

Here is a simplified example

type MyStruct struct {
	DID string
	PID string
}

type MyNewStruct struct {
	MyStruct
    MyNewKey string
}

ms := MyStruct{
    DID: "did",
    PID: "pid",
}

m := MyNewStruct{
    MyStruct: ms,
    MyNewKey: "test",
}

I'm not sure I fully understand what your looking for, but this may help.

type MyStruct struct {
   DID string
   PID string
}

type myNewStruct struct {
   MyStruct
   newKey string
}

func main() {
   s1 := MyStruct{DID: `bson:"d_id" json:"d_id"`}
   s2 := myNewStruct{MyStruct: s1, newKey: `bson:"new_key" json:"new_key"`}
   fmt.Println(s2.DID)
   fmt.Println(s2.newKey)
}