如何在golang中彼此转换相同的签名类型？

Question

I want to convert from;

type MyType map[string]interface{}

to;

logrus.Fields // map[string]interface{}

My code is;

func newAction(data interface{}) { // data comes as 'MyType'
    df := data.(logrus.Fields)
}

I take this error;

interface conversion: interface {} is MyType, not logrus.Fields

Answer 1

The question uses a type assertion. A type assertion asserts that an interface value is a specific type. It does not convert types.

Use a conversion to convert between the types:

var v1 MyType
var v2 logrus.Fields

v2 = logrus.Fields(v1)
v1 = MyType(v2)

If you have a function that can accept either type, use a type switch and then convert each specific type:

func newAction(data interface{}) {
    var df logrus.Fields
    switch v := data.(type) {
    case logur.Fields:
        df = v
    case MyType:
        df = logrus.Fields(v)
    default:
        // handle error
    }
    ... do something with df
}