英文:
Passing an inherited struct back as the base object
问题
我确定这是一个我还没有解决的Go语法问题。
我得到的错误信息是：
无法将*term（类型为elastic.AggregationBucketKeyItem）作为参数传递给extractBucket中的elastic.Aggregations类型
生成错误的代码行是：
"Value": extractBucket(parts[1:], *term),
相关的代码如下：
// 来自 https://github.com/olivere/elastic/blob/v3.0.22/search_aggs.go
type Aggregations map[string]*json.RawMessage
type AggregationBucketSignificantTerms struct {
Aggregations
DocCount int64 //`json:"doc_count"`
Buckets []*AggregationBucketSignificantTerm //`json:"buckets"`
Meta map[string]interface{} // `json:"meta,omitempty"`
}
// 我的代码
func extractBucket(parts []string, aggs elastic.Aggregations) interface{} {
// 移除了一堆代码
terms, found := aggs.Terms(part)
for _, term := range terms.Buckets {
if len(parts) == 0 {
retval[(term.Key).(string)] = map[string]interface{}{
"Count": term.DocCount,
}
} else {
retval[(term.Key).(string)] = map[string]interface{}{
"Count": term.DocCount,
"Value": extractBucket(parts[1:], *term),
}
}
}
}
以上是要翻译的内容。
英文:
I'm sure this is a syntax issue that I've yet to figure out with Go -
The error I'm getting --
> cannot use *term (type elastic.AggregationBucketKeyItem) as type elastic.Aggregations in argument to extractBucket
The line that's generating the error is
"Value": extractBucket(parts[1:], *term),
The relevant code, for context
// from https://github.com/olivere/elastic/blob/v3.0.22/search_aggs.go
type Aggregations map[string]*json.RawMessage
type AggregationBucketSignificantTerms struct {
Aggregations
DocCount int64 //`json:"doc_count"`
Buckets []*AggregationBucketSignificantTerm //`json:"buckets"`
Meta map[string]interface{} // `json:"meta,omitempty"`
}
// my code
func extractBucket(parts []string, aggs elastic.Aggregations) interface{} {
// bunch of code removed
terms, found := aggs.Terms(part)
for _, term := range terms.Buckets {
if len(parts) == 0 {
retval[(term.Key).(string)] = map[string]interface{}{
"Count": term.DocCount,
}
} else {
retval[(term.Key).(string)] = map[string]interface{}{
"Count": term.DocCount,
"Value": extractBucket(parts[1:], *term),
}
}
}
}
答案1
得分: 2
错误的原因很明显：
>在提取桶时，无法将(*term, 变量名)（类型为elastic.AggregationBucketKeyItem，当前类型为变量）作为参数传递给extractBucket（类型为elastic.Aggregations，期望类型为elastic.Aggregations）。
无论您的*term值是什么，
生成代码为：for _, term := range terms.Buckets {
该函数的参数类型应为：
extractBucket(parts []string, aggs elastic.Aggregations)
需要传入elastic.Aggregations类型的参数。
英文:
Well the error is pretty self explanatory:
>cannot use (*term, variable name) (type elastic.AggregationBucketKeyItem <-- Variables current type) as (type elastic.Aggregations <-- Expected type) in argument to extractBucket
Whatever your *term value
Generated by: for _, term := range terms.Buckets {
is not the right type for the function
extractBucket(parts []string, aggs elastic.Aggregations)
Takes a type of elastic.Aggregations
答案2
得分: 2
这是一个常见的误解，认为嵌入一个类型会使你“继承”该类型。尽管AggregationBucketSignificantTerms 嵌入了Aggregations，但对编译器来说它并不是一个Aggregations类型。它只是具有一个Aggregations类型的字段，并在其顶层提供该类型的方法。这感觉有点像继承，但可能与Java子类的用法不同。
要解决这个问题，你可以尝试使用"Value": extractBucket(parts[1:], *term.Aggregations)，但我不确定这是否能解决你的问题。
英文:
It is a common misunderstanding that embedding a type makes you "inherit" that type. Even though AggregationBucketSignificantTerms embeds an Aggregations, it is not one to the compiler. It merely has a field of type Aggregations, and it provides methods from that type at it's top level. It feels a bit like inheritance, but is probably not what you are used to with things like Java subclasses.
To solve it you can try "Value": extractBucket(parts[1:], *term.Aggregations),, but I am not clear if that will solve your problem or not.
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