英文:
How do I get the tags in a struct through packages/packages?
问题
我想获取有关结构体的信息，以便在自定义Go生成器中使用。
通过使用packages/packages，我可以获取结构体的所有字段和它们的类型，但我无法弄清楚如何获取每个字段的标签。生成器不在与我尝试读取的结构体相同的代码库中运行，所以据我所知，我不能使用反射本身。
以下是我目前的示例：
package models
type User struct {
Email string `json:"email" binding:"email"`
FirstName string `json:"firstName" binding:"required"`
}
如何获取字段及其类型：
cfg := &packages.Config{
Mode: packages.NeedName | packages.NeedFiles | packages.NeedSyntax | packages.NeedTypes | packages.NeedTypesInfo,
}
pkgs, _ := packages.Load(cfg, "./models")
pkg := pkgs[0]
structInfo := pkg.Types.Scope().Lookup("User").Type().Underlying().(*types.Struct)
for i := 0; i < structInfo.NumFields(); i++ {
field := structInfo.Field(i)
fieldType := field.Type()
print("Field: ", field.Name(), " Type: ", fieldType.String())
}
在反射中，可以使用以下方式获取标签：
fieldType.Tag().Get("json")
但在packages/packages的结果中似乎不可能。是否有办法获取标签呢？
英文:
I want to fetch information about a struct to use in a custom go generator.
By using packages/packages I am able to fetch all fields from a struct and their types, I however can't figure out how to also fetch the tags for each field. The generator doesn't run in the same code base as the struct I try to read, so for as far as I know, I can't use reflection itself.
Example of what I have so far:
package models
type User struct {
Email string `json:"email" binding:"email"`
FirstName string `json:"firstName" binding:"required"`
}
How I get the fields and their types:
cfg := &packages.Config{
Mode: packages.NeedName | packages.NeedFiles | packages.NeedSyntax | packages.NeedTypes | packages.NeedTypesInfo,
}
pkgs, _ := packages.Load(cfg, "./models")
pkg := pkgs[0]
structInfo := pkg.Types.Scope().Lookup("User").Type().Underlying().(*types.Struct)
for i := 0; i < structInfo.NumFields(); i++ {
field := structInfo.Field(i)
fieldType := field.Type()
print("Field: ", field.Name(), " Type: ", fieldType.String())
}
In reflect there is the possibility to get the Tag by using
fieldType.Tag().Get("json")
But this doesn't seem possible in results from packages/packages.
Is there a way to get the tags anyway?
答案1
得分: 1
使用Tag方法。你还可以使用reflect.StructTag作为辅助类型来解析原始标签字符串中的各个标签值。
tag := structInfo.Tag(i) // 获取原始未解析的标签字符串
stag := reflect.StructTag(tag) // 转换为reflect.StructTag类型
stag.Get("json") // 从标签中获取值
https://go.dev/play/p/INpOyL9rS_f
英文:
Use the Tag method. And you can also use reflect.StructTag as a helper type to parse the individual tag values from the raw tag string.
tag := structInfo.Tag(i) // get the raw unparsed tag string
stag := reflect.StructTag(tag) // convert to reflect.StructTag
stag.Get("json") // get values from the tag
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