可选校验规则
当给定的数据校验规则中不包含required*规则时，表示该规则不是一个必须规则。如果当给定的值为nil或者空字符串时，将会忽略其校验。
示例1，空字符串
package main
import (
"fmt"
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/os/gctx"
)
func main() {
type Params struct {
Page int `v:"required|min:1 # page is required"`
Size int `v:"required|between:1,100 # size is required"`
ProjectId string `v:"between:1,10000 # project id must between {min}, {max}"`
}
var (
ctx = gctx.New()
obj = &Params{
Page: 1,
Size: 10,
}
)
err := g.Validator().Data(obj).Run(ctx)
fmt.Println(err)
// Output:
// <nil>
}示例2，空指针属性
package main
import (
"fmt"
"github.com/gogf/gf/v2/container/gvar"
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/os/gctx"
)
func main() {
type Params struct {
Page int `v:"required|min:1 # page is required"`
Size int `v:"required|between:1,100 # size is required"`
ProjectId *gvar.Var `v:"between:1,10000 # project id must between {min}, {max}"`
}
var (
ctx = gctx.New()
obj = &Params{
Page: 1,
Size: 10,
}
)
err := g.Validator().Data(obj).Run(ctx)
fmt.Println(err)
// Output:
// <nil>
}示例3，空整型属性
需要注意的是，如果键值为 0 或者 false，参数值将仍然会被校验。
package main
import (
"fmt"
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/os/gctx"
)
func main() {
type Params struct {
Page int `v:"required|min:1 # page is required"`
Size int `v:"required|between:1,100 # size is required"`
ProjectId int `v:"between:1,10000 # project id must between {min}, {max}"`
}
var (
ctx = gctx.New()
obj = &Params{
Page: 1,
Size: 10,
}
)
err := g.Validator().Data(obj).Run(ctx)
fmt.Println(err)
// Output:
// <nil>
}执行后，终端输出：
project id must between 1, 10000示例4，通过 map 传参
package main
import (
"github.com/gogf/gf/v2/frame/g"
"github.com/gogf/gf/v2/os/gctx"
)
func main() {
var (
ctx = gctx.New()
params = map[string]interface{}{
"passport": "",
"password": "123456",
"password2": "1234567",
}
rules = []string{
"passport@length:6,16",
"password@required|length:6,16|same:password2",
"password2@required|length:6,16",
}
)
err := g.Validator().Rules(rules).Data(params).Run(ctx)
if err != nil {
g.Dump(err.Maps())
}
}需要注意，其中的 passport 键名并没有 required 规则，因此即便给定的 passport 参数为空字符串，不满足规则时，也并没有报错，因为校验组件将其看做可选校验规则。
执行后，终端输出：
{
"password": {
"same": "The password value `123456` must be the same as field password2",
},
}