英文:
How to trim white space for query and json in go gin?
问题
我有一个类似这样的结构体：
type Data struct {
Foo string `json:"foo" binding:"required"`
}
我使用ShouldBind将查询或JSON体绑定到该结构体：
data := Data{}
err := ctx.ShouldBind(&data)
我想知道如何最佳实践地去除字符串字段的空格？
将{"foo": " bar "}转换为{"foo": "bar"}。
- 我尝试使用自定义的字符串类型，并添加自定义的UnmarshalJSON函数，但如果是查询的话，它对ctx.ShouldBind无效。
type Data struct {
Foo TrimSpaceString `json:"foo" binding:"required"`
}
type TrimSpaceString string
func (t *TrimSpaceString) UnmarshalJSON(data []byte) error {
data = bytes.Trim(data, "\"")
data = bytes.Trim(data, " ")
*t = TrimSpaceString(strings.TrimSpace(string(data)))
return nil
}
- 我还尝试使用conform并为结构体添加标签。但是我必须在绑定后添加
conform.Strings(&data)，这不太方便。
type Data struct {
Foo TrimSpaceString `json:"foo" binding:"required" conform:"trim"`
}
err := ctx.ShouldBind(&data)
conform.Strings(&data)
- 我应该自定义一个Binding并在Binding内部去除字符串的空格吗？
英文:
I have a struct like this
type Data struct {
Foo string `json:"foo" binding:"required"`
}
And I use ShouldBind to bind query or json body to the struct.
data := Data{}
err := ctx.ShouldBind(&data)
I was wondering what is the best practice to trim white space for the string field?
transform {"foo": " bar "} to struct {"foo": "bar"}
- I have tried using custom string type, and add custom UnmarshalJSON function, but it won't work for ctx.shouldBind if it is query.
type Data struct {
Foo TrimSpaceString `json:"foo" binding:"required"`
}
type TrimSpaceString string
func (t *TrimSpaceString) UnmarshalJSON(data []byte) error {
data = bytes.Trim(data, "\"")
data = bytes.Trim(data, " ")
*t = TrimSpaceString(strings.TrimSpace(string(data)))
return nil
}
- I also tried to use conform and add tag for struct. But I have to add conform.Strings(data) after bind it and it is not convinence.
type Data struct {
Foo TrimSpaceString `json:"foo" binding:"required" conform:"trim"`
}
err := ctx.ShouldBind(&data)
conform.Strings(&data)
- Should I custom a Binding and trim string inside Binding?
答案1
得分: 1
我通过修改UnmarshalJSON函数使其正常工作。我没有什么可以解释的，因为我也是新手，但我会尝试解释一下。不同的是，我们通过json.Unmarshal将字节data转换为字符串。然后，我们修剪字符串上的空格，并将其附加到字段或原始字符串上。
type trim string
func (t *trim) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
*t = trim(strings.TrimSpace(s))
fmt.Printf("这些是字符串：%s\n", *t)
return nil
}
如果你想自己尝试，这是playground链接：
https://go.dev/play/p/BuxvMQibVsn
英文:
I got this working by modifying UnmarshalJSON function a bit. I don't have anything to explain as I'm also new, but will try, what's different is that we are converting byte data into a string by json.Unmarshal.Then we trim the space on string and appends it to the field or the original string
type trim string
func (t *trim) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
*t = trim(strings.TrimSpace(s))
fmt.Printf("these are the strings: '%s'\n", *t)
return nil
}
Here is the playground if you want to try it yourself
https://go.dev/play/p/BuxvMQibVsn
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