如何在golang中執行條件需求驗證？

Question

在Golang ozzo驗證中，如何驗證依賴於另一個字段的字段？

舉例來說，如果我有以下幾點：

return validation.ValidateStruct(&c, 
     validation.Field(&c.Name, validation.Required, validation.Length(5, 20)), 

     validation.Field(&c.Gender, validation.In("Female", "Male")), 

     validation.Field(&c.Email, is.Email), 

     validation.Field(&c.Address), 

我如何添加一個驗證，只有當電子郵件不爲空的地址是必需的？

Answer 1

可以實現它以兩種ways-

• 基於前提價值即加上你自己的custom rules
• 有條件加FieldRules檢查Email同時創造領域的規則，然後將其提供給validation.ValidateStruct

例如：

type Sample struct { 
    Name string 
    Gender string 
    Email string 
    Address Address 
} 

type Address struct { 
    // ... fields 
} 

func (s Sample) Validate() error { 
    var fieldRules []*validation.FieldRules 

    fieldRules = append(fieldRules, validation.Field(&s.Name, validation.Required, validation.Length(5, 20))) 
    fieldRules = append(fieldRules, validation.Field(&s.Gender, validation.In("Female", "Male"))) 
    fieldRules = append(fieldRules, validation.Field(&s.Email, is.Email)) 

    if len(strings.TrimSpace(s.Email)) > 0 { 
     fieldRules = append(fieldRules, validation.Field(&s.Address, validation.Required)) 
     fieldRules = append(fieldRules, validation.Field(&s.Address)) 
    } 

    return validation.ValidateStruct(&s, fieldRules...) 
}