Store slices and nested structures in MongoDB Golang

I have built a program in Go with the next structure

type A struct {
  feature []string
}
type B struct {
  title string
  other_feature []A
}

I tried to use the bson package but only the title appears on the database after execution. Does anyone have a solution?

You need to export the field names by starting the field name with an uppercase letter. Use the bson field tag to specify the named used in the database.

type A struct {
  Feature []string `bson:"feature"`
}
type B struct {
  Title string       `bson:"title"`
  Other_feature []A  `bson:"other_feature"`
}