如何在go列表中添加“子”结构

Question

type A struct {
  B []struct {
    C string
    D []struct {
      E string
      F []struct {
        G string
      }
    }
  }
}

Lets say I have an instance of struct A, and I want to append a struct D into it. I would try to do something like

var a A;
...
a.B.D = append(a.B.D, ???)

??? = A.B.D

--> type A has no method B

??? = D

--> undefined: D

--- Edit for more complete example ---

type A struct {
  B []struct {
    C string
    D hugeNestedElement
  }
}

var a A
// Goal is to create many B's
a = append(a, what_goes_here)
// or ...
a = append(a.B, what_goes_here)

Answer 1

Since B is a slice of structs, it has no D attribute directly. There could be a variable number of B's:

type A struct {
  B []struct {
    C string
    D []struct {
      E string
      F []struct {
        G string
      }
    }
  }
}

Since B is a slice the entry below assumes you'd like to append a new D to the first B:

A.B[0].D = append(A.B[0].D, anotherD)