doucheng1891 2018-11-09 03:46
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切片结构无法插入golang中的接口切片[重复]

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I have Tag struct and TableAbstruct interface like below example.

[Tag struct]

type Tag struct {
    Id   int    `db:"id"`
    Name string `db:"Name"`
}
func (tag Tag) Serialize() []string {
    ...
}

[TableAbstruct interface]

type TableAbstruct interface {
    Serialize() []string
}

Xxx() function returns []TableAbstruct, but actual type is []Tag. And below program will work well because Tag includes TableAbstruct interface.

func Xxx() []TableAbstruct {
    result := []TableAbstruct{}
    for i := 0; i < 10; i++ {
        table_obj := Tag{}
        result = append(result, table_obj)
    }
    return result
}

But I want to write like below and I couldn't. I think the problem is TypeError. But I couldn't understand why the error has occurred.

func Xxx() []TableAbstruct {
    result := []Tag{}
    return result
}
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  • duangai1941 2018-11-09 04:29
    关注

    Go does not have any fanciness around slices and types. Put simply, if you say you are going to return []TableAbstruct, you have to return that exactly. So if you want to return a []Tag, you have to create a slice of []TableAbstruct and then go populate it manually:

    func Xxx() []TableAbstruct {
      var returnValue []TableAbstruct
      for _, t := range result {
        returnValue = append(returnValue, t)
      }
      return returnValue
    }
    
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