在golang中对降序结构进行排序

Question

Please see this playground. What I want is quiet simple: I want to sort all "records" descending. I cannot figure out how. Reason is that my struct contains one or more records and I'm not sure how to handle that. (f.e. this works fine)

Answer 1

From your example, you are trying to sort the root element <records> instead of the sub-elements <record>.

This example works better, with:

• type ById []Record
• sort.Sort(sort.Reverse(ById(records.Records)))

Your Len(), Swap() and Less() methods remain unchanged, but use as a receiver a Record instance instead of Records.

Output:

{{ records} 
  [{{ record} 64321 http://golang.com} 
   {{ record} 3456 http://www.lommers.org/sampleurl} 
   {{ record} 4 http://www.this-is-my-url.com}]} 

---

As I mention in "How to avoid re-implementing sort.Interface for similar golang structs", this changes with Go 1.8 and commit ad26bb5:

You only define a Less() anonymous lambda

a := ById(records.Records)
sort.Slice(a, func(i, j int) bool {
    return a[i] > a[j]
})