Package dynamic struct provides possibility to dynamically, in runtime, extend or merge existing defined structs or to provide completely new struct.
Main features:
- Building completely new struct in runtime
- Extending existing struct in runtime
- Merging multiple structs in runtime
- Adding new fields into struct
- Removing existing fields from struct
- Modifying fields' types and tags
- Easy reading of dynamic structs
- Mapping dynamic struct with set values to existing struct
- Make slices and maps of dynamic structs
Works out-of-the-box with:
- https://github.com/go-playground/form
- https://github.com/go-playground/validator
- https://github.com/leebenson/conform
- https://golang.org/pkg/encoding/json/
- ...
Environment:
- MacBook Pro (13-inch, Early 2015), 2,7 GHz Intel Core i5
- go version go1.11 darwin/amd64
goos: darwin goarch: amd64 pkg: github.com/ompluscator/dynamic-struct BenchmarkClassicWay_NewInstance-4 2000000000 0.34 ns/op BenchmarkNewStruct_NewInstance-4 10000000 141 ns/op BenchmarkNewStruct_NewInstance_Parallel-4 20000000 89.6 ns/op BenchmarkExtendStruct_NewInstance-4 10000000 135 ns/op BenchmarkExtendStruct_NewInstance_Parallel-4 20000000 89.5 ns/op BenchmarkMergeStructs_NewInstance-4 10000000 140 ns/op BenchmarkMergeStructs_NewInstance_Parallel-4 20000000 94.3 ns/op package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) func main() { instance := dynamicstruct.NewStruct(). AddField("Integer", 0, `json:"int"`). AddField("Text", "", `json:"someText"`). AddField("Float", 0.0, `json:"double"`). AddField("Boolean", false, ""). AddField("Slice", []int{}, ""). AddField("Anonymous", "", `json:"-"`). Build(). New() data := []byte(` { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } `) err := json.Unmarshal(data, &instance) if err != nil { log.Fatal(err) } data, err = json.Marshal(instance) if err != nil { log.Fatal(err) } fmt.Println(string(data)) // Out: // {"int":123,"someText":"example","double":123.45,"Boolean":true,"Slice":[1,2,3]} }package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) type Data struct { Integer int `json:"int"` } func main() { instance := dynamicstruct.ExtendStruct(Data{}). AddField("Text", "", `json:"someText"`). AddField("Float", 0.0, `json:"double"`). AddField("Boolean", false, ""). AddField("Slice", []int{}, ""). AddField("Anonymous", "", `json:"-"`). Build(). New() data := []byte(` { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } `) err := json.Unmarshal(data, &instance) if err != nil { log.Fatal(err) } data, err = json.Marshal(instance) if err != nil { log.Fatal(err) } fmt.Println(string(data)) // Out: // {"int":123,"someText":"example","double":123.45,"Boolean":true,"Slice":[1,2,3]} }package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) type DataOne struct { Integer int `json:"int"` Text string `json:"someText"` Float float64 `json:"double"` } type DataTwo struct { Boolean bool Slice []int Anonymous string `json:"-"` } func main() { instance := dynamicstruct.MergeStructs(DataOne{}, DataTwo{}). Build(). New() data := []byte(` { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } `) err := json.Unmarshal(data, &instance) if err != nil { log.Fatal(err) } data, err = json.Marshal(instance) if err != nil { log.Fatal(err) } fmt.Println(string(data)) // Out: // {"int":123,"someText":"example","double":123.45,"Boolean":true,"Slice":[1,2,3]} }package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) type DataOne struct { Integer int `json:"int"` Text string `json:"someText"` Float float64 `json:"double"` } type DataTwo struct { Boolean bool Slice []int Anonymous string `json:"-"` } func main() { instance := dynamicstruct.MergeStructs(DataOne{}, DataTwo{}). Build(). New() data := []byte(` { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } `) err := json.Unmarshal(data, &instance) if err != nil { log.Fatal(err) } reader := dynamicstruct.NewReader(instance) fmt.Println("Integer", reader.GetField("Integer").Int()) fmt.Println("Text", reader.GetField("Text").String()) fmt.Println("Float", reader.GetField("Float").Float64()) fmt.Println("Boolean", reader.GetField("Boolean").Bool()) fmt.Println("Slice", reader.GetField("Slice").Interface().([]int)) fmt.Println("Anonymous", reader.GetField("Anonymous").String()) var dataOne DataOne err = reader.ToStruct(&dataOne) fmt.Println(err, dataOne) var dataTwo DataTwo err = reader.ToStruct(&dataTwo) fmt.Println(err, dataTwo) // Out: // Integer 123 // Text example // Float 123.45 // Boolean true // Slice [1 2 3] // Anonymous // <nil> {123 example 123.45} // <nil> {true [1 2 3] } }package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) type Data struct { Integer int `json:"int"` Text string `json:"someText"` Float float64 `json:"double"` Boolean bool Slice []int Anonymous string `json:"-"` } func main() { definition := dynamicstruct.ExtendStruct(Data{}).Build() slice := definition.NewSliceOfStructs() data := []byte(` [ { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } ] `) err := json.Unmarshal(data, &slice) if err != nil { log.Fatal(err) } data, err = json.Marshal(slice) if err != nil { log.Fatal(err) } fmt.Println(string(data)) // Out: // [{"Boolean":true,"Slice":[1,2,3],"int":123,"someText":"example","double":123.45}] reader := dynamicstruct.NewReader(slice) readersSlice := reader.ToSliceOfReaders() for k, v := range readersSlice { var value Data err := v.ToStruct(&value) if err != nil { log.Fatal(err) } fmt.Println(k, value) } // Out: // 0 {123 example 123.45 true [1 2 3] } }package main import ( "encoding/json" "fmt" "log" "github.com/ompluscator/dynamic-struct" ) type Data struct { Integer int `json:"int"` Text string `json:"someText"` Float float64 `json:"double"` Boolean bool Slice []int Anonymous string `json:"-"` } func main() { definition := dynamicstruct.ExtendStruct(Data{}).Build() mapWithStringKey := definition.NewMapOfStructs("") data := []byte(` { "element": { "int": 123, "someText": "example", "double": 123.45, "Boolean": true, "Slice": [1, 2, 3], "Anonymous": "avoid to read" } } `) err := json.Unmarshal(data, &mapWithStringKey) if err != nil { log.Fatal(err) } data, err = json.Marshal(mapWithStringKey) if err != nil { log.Fatal(err) } fmt.Println(string(data)) // Out: // {"element":{"int":123,"someText":"example","double":123.45,"Boolean":true,"Slice":[1,2,3]}} reader := dynamicstruct.NewReader(mapWithStringKey) readersMap := reader.ToMapReaderOfReaders() for k, v := range readersMap { var value Data err := v.ToStruct(&value) if err != nil { log.Fatal(err) } fmt.Println(k, value) } // Out: // element {123 example 123.45 true [1 2 3] } }