文档：https://pkg.go.dev/github.com/evanphx/json-patch

Func

  1. // CreateMergePatch 返回从 original 到 modified 需要做改动，也就是patch
  2. func CreateMergePatch(originalJSON, modifiedJSON []byte) ([]byte, error)
  4. // MergePatch 将docData 做 patch 改动
  5. func MergePatch(docData, patchData []byte) ([]byte, error)
  7. // Equal 比较两个json是否相等
  8. func Equal(a, b []byte) bool

type Patch

  1. type Patch []Operation
  3. func DecodePatch(buf []byte) (Patch, error)
  4. func (p Patch) Apply(doc []byte) ([]byte, error)

type Operation

  1. type Operation map[string]*json.RawMessage
  3. func (o Operation) From() (string, error)
  4. func (o Operation) Kind() string // reads the "op" field of the Operation
  5. func (o Operation) Path() (string, error) // reads the "path" field of the Operation
  6. func (o Operation) ValueInterface() (interface{}, error)

Demo

Combine merge patches

  1. func main() {
  2.     original := []byte(`{"name": "John", "age": 24, "height": 3.21}`)
  3.     target := []byte(`{"name": "Jane", "age": 24, "money":1}`)
  5.     patch, err := jsonpatch.CreateMergePatch(original, target)
  6.     if err != nil {
  7.         panic(err)
  8.     }
  10.     fmt.Println(string(patch))
  11.     // {"height":null,"money":1,"name":"Jane"}
  13.     alternative := []byte(`{"name": "Tina", "age": 28, "height": 3.75}`)
  14.     modifiedAlternative, err := jsonpatch.MergePatch(alternative, patch)
  16.     fmt.Println(string(modifiedAlternative))
  17.     // {"age":28,"money":1,"name":"Jane"}
  18. }

apply a merge patch

  1. func main() {
  2.     patchJSON := []byte(`[
  3.         {"op": "replace", "path": "/name", "value": "Jane"},
  4.         {"op": "remove", "path": "/height"},
  5.         {"op": "add", "path": "/money", "value": 100},
  6.         {"op": "add", "path": "/obj/key", "value": "val"}
  7.     ]`)
  9.     original := []byte(`{"name": "John", "age": 24, "height": 3.21, "obj":{}}`)
  10.     patch, err := jsonpatch.DecodePatch(patchJSON)
  11.     if err != nil {
  12.         panic(err)
  13.     }
  15.     modified, err := patch.Apply(original)
  16.     if err != nil {
  17.         panic(err)
  18.     }
  19.     fmt.Println(string(modified))
  20.     // {"age":24,"money":100,"name":"Jane","obj":{"key":"val"}}
  21. }