英文:
sort a map of structs in golang
问题
我有一个类似这样的地图：
Key: 9970DLXEVOQ0O Value: [{9972IOFNIDER6 0.3},{9972MFYWYJIEK 0.2},{9972QIUUINW6R 0.5}]Key: 9970DLXEVOQ01 Value: [{9972IOFNIDER6 0.3}]Key: 9970QYPOYUUIO Value: [{9972VOFA3OJLK 0.4}]
在Golang中，它被命名为product_deal，其中key是字符串，value是一个结构体：
type product_detail struct {deal_id stringrating float64}
我需要根据每个值字段中的评分（降序）对值进行排序，输出应该是：
Key: 9970DLXEVOQ0O Value: [{9972QIUUINW6R 0.5},{9972IOFNIDER6 0.3},{9972MFYWYJIEK 0.2}]Key: 9970DLXEVOQ01 Value: [{9972IOFNIDER6 0.3}]Key: 9970QYPOYUUIO Value: [{9972VOFA3OJLK 0.4}]
有什么想法如何实现这个？我看了其他帖子关于如何对地图进行排序，但是没有找到实现的方法。任何帮助将不胜感激。
英文:
I have a map which is like this
Key: 9970DLXEVOQ0O Value: [{9972IOFNIDER6 0.3},{9972MFYWYJIEK 0.2},{9972QIUUINW6R 0.5}]Key: 9970DLXEVOQ01 Value: [{9972IOFNIDER6 0.3}]Key: 9970QYPOYUUIO Value: [{9972VOFA3OJLK 0.4}]
in golang named product_deal in which key is string and value is a struct :
type product_detail struct {deal_id stringrating float64}
I need to sort the values based on ratings(descending ) in each value field the output should be i.e
Key: 9970DLXEVOQ0O Value: [{9972QIUUINW6R 0.5},{9972IOFNIDER6 0.3},{9972MFYWYJIEK 0.2}]Key: 9970DLXEVOQ01 Value: [{9972IOFNIDER6 0.3}]Key: 9970QYPOYUUIO Value: [{9972VOFA3OJLK 0.4}]
Any ideas of how this needs to be done. i did have a look at other post which sort maps but could not get the implementation.
Any help would be appreciated.
答案1
得分: 12
以下是原始问题的评论的详细说明，这是一个可以在Go playground上运行的示例。请注意，我可能对您想要的类型结构进行了错误解释，但是思路应该是清楚的。
package mainimport "fmt"import "sort"type Product struct {Id stringRating float64}type Deal struct {Id stringproducts []Product}type Deals []Deal// 确保它满足 sort.Interface 接口func (d Deals) Len() int { return len(d) }func (d Deals) Less(i, j int) bool { return d[i].Id < d[j].Id }func (d Deals) Swap(i, j int) { d[i], d[j] = d[j], d[i] }func main() {deals := Deals{{"9970DLXEVOQ0O", []Product{{"9972MFYWYJIEK", 0.2}}},{"9970DLXEVOQ01", []Product{{"9972IOFNIDER6", 0.3}}},{"9970QYPOYUUIO", []Product{{"9972VOFA3OJLK", 0.4}}},{"9970DLYKLAO8O", []Product{{"9972IOFNIDER6", 0.3}}},{"9970QYPMNAUUI", []Product{{"9972QIUUINW6R", 0.5}}},}sort.Sort(deals)for _, d := range deals {fmt.Println(d)}}
希望对您有所帮助！
英文:
To expand on my comment on the original question, here is a working example which can be run on the Go playground. Note that I may have misinterpreted the structure of the types you want to have, but the idea should be clear.
package mainimport "fmt"import "sort"type Product struct {Id stringRating float64}type Deal struct {Id stringproducts []Product}type Deals []Deal// Ensure it satisfies sort.Interfacefunc (d Deals) Len() int { return len(d) }func (d Deals) Less(i, j int) bool { return d[i].Id < d[j].Id }func (d Deals) Swap(i, j int) { d[i], d[j] = d[j], d[i] }func main() {deals := Deals{{"9970DLXEVOQ0O", []Product{{"9972MFYWYJIEK", 0.2}}},{"9970DLXEVOQ01", []Product{{"9972IOFNIDER6", 0.3}}},{"9970QYPOYUUIO", []Product{{"9972VOFA3OJLK", 0.4}}},{"9970DLYKLAO8O", []Product{{"9972IOFNIDER6", 0.3}}},{"9970QYPMNAUUI", []Product{{"9972QIUUINW6R", 0.5}}},}sort.Sort(deals)for _, d := range deals {fmt.Println(d)}}
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