我有两个结构定义如下:
// DuplicatedAd format
type DuplicatedAd struct {
// Ad Identifier
AdID int `form:"ad_id" json:"ad_id,omitempty" xml:"ad_id"`
// Parameters of an Ad, can be empty
AdParams string `form:"ad_params" json:"ad_params,omitempty" xml:"ad_params"`
// Body of the Ad
Body string `form:"body" json:"body,omitempty" xml:"body"`
// Body Duplicate Percentage
BodyScore float64 `form:"body_score" json:"body_score,omitempty" xml:"body_score"`
// Category of the Ad
Category int `form:"category" json:"category,omitempty" xml:"category"`
// The ad uploaded main image
Image string `form:"image,omitempty" json:"image,omitempty" xml:"image,omitempty"`
// Ad Listing ID
ListID int `form:"list_id" json:"list_id,omitempty" xml:"list_id"`
// Listing time for the ad
ListTime string `form:"list_time" json:"list_time,omitempty" xml:"list_time"`
// the ad Phone number
Phone string `form:"phone,omitempty" json:"phone,omitempty" xml:"phone,omitempty"`
// Region of the Ad
Region int `form:"region" json:"region,omitempty" xml:"region"`
// Ad Status
Status string `form:"status" json:"status,omitempty" xml:"status"`
// Subject of the Ad
Subject string `form:"subject" json:"subject,omitempty" xml:"subject"`
// Subject Duplicate Percentage
SubjectScore float64 `form:"subject_score" json:"subject_score,omitempty" xml:"subject_score"`
// Type of the Ad
Type string `form:"type" json:"type,omitempty" xml:"type"`
// Total Score
TotalScore float64 `form:"total_score" json:"total_score,omitempty" xml:"total_score"`
}
// CpResponse format
type CpResponse struct {
// Number of doublets
Count int `json:"count"`
// The Doublet Ads to show
Duplicated []DuplicatedAd `json:"duplicated"`
}
我正在定义一个变量var DuplicatedAds = CpResponse{}
,并在一个循环中我将一些结果附加到它,如下所示:
DuplicatedAds.Duplicated = append(DuplicatedAds.Duplicated, t)
DuplicatedAds.Count = len(DuplicatedAds.Duplicated)
我希望DuplicatedAds.Duplicated
按TotalScore
排序。
我是golang的新手,所以经过一番研究后我发现我必须先实现这三个功能才能排序
func (slice DuplicatedAd) Len() int {
return len(slice)
}
func (slice DuplicatedAd) Less(i, j int) bool {
return slice[i].TotalScore < slice[j].TotalScore
}
func (slice DuplicatedAd) Swap(i, j int) {
slice[i], slice[j] = slice[j], slice[i]
}
但是当我尝试编译时我得到了这个错误:
./duplicates.go:165: cannot use DuplicatedAds.Duplicated (type []DuplicatedAd) as type sort.Interface in argument to sort.Sort:
[]DuplicatedAd does not implement sort.Interface (missing Len method)
./types.go:68: invalid argument slice (type DuplicatedAd) for len
./types.go:72: invalid operation: slice[i] (type DuplicatedAd does not support indexing)
./types.go:72: invalid operation: slice[j] (type DuplicatedAd does not support indexing)
./types.go:76: invalid operation: slice[i] (type DuplicatedAd does not support indexing)
./types.go:76: invalid operation: slice[j] (type DuplicatedAd does not support indexing)
./types.go:76: invalid operation: slice[i] (type DuplicatedAd does not support indexing)
我怎么能有一个CpResponse
对象,Duplicated
数组按DuplicatedAd.TotalScore
排序?
答案 0 :(得分:3)
从Go 1.8开始,您可以使用以下功能对切片进行排序:
sort.Slice(DuplicatedAds.Duplicated, func(i int, j int) bool {
return DuplicatedAds.Duplicated[i].TotalScore < DuplicatedAds.Duplicated[j].TotalScore
})
您不再需要在那里定义这三个功能(Len
,Less
和Swap
)。请注意我们如何使用Len
的相同实现作为sort.Slice
的参数。
答案 1 :(得分:0)
cd1提供了一个很好的解决方案。至于你的方法不起作用的原因,那是因为它们在单个结构上运行,而不是一块结构。
你会想要更像这样的东西,其中每个方法都适用于DuplicatedAdSlice类型而不是DuplicatedAd类型。
[(ngModel)]="searchText" (ngModelChange)="SearchTextChange()"
更新CpResponse结构以使用类型别名
type DuplicatedAdSlice []DuplicatedAd // Type alias
func (slice DuplicatedAdSlice) Len() int {
return len(slice)
}