在golang中将数组值设置为结构

Question

The structure is

type TopicModels struct {
    Topics []string
}

And I want to set the value into this structure like following approach

var topics [2]string
topics[0] = "Sport Nice"
topics[1] = "Nice Sport"
return &TopicModels{Topics: topics}, nil

However, it tells me that

 cannot use topics (type [2]string) as type []string in field value

How can I change the code to make it correct?

Answer 1

As the error message says, the Topics field has type []string (an arbitrary length slice of strings), and the topics variable has type [2]string (an string array of length 2). These are not the same type, so you get the error.

There are two ways you could go about solving this:

1. make topics a slice:

   topics = make([]string, 2)
   topics[0] = "Sport Nice"
   ...
   

2. Use a slice expression to create a slice representing your array:

   ...
   return &TopicModels{Topics: topics[:]}, nil