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Embedded structs v2 #78

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Embedded structs v2 #78

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0bfd2ea
working version
skimata Feb 4, 2017
8e20fb2
fix text
skimata Feb 6, 2017
e6596dc
combine test files
skimata Feb 6, 2017
5dbf82f
move private funcs to bottom
skimata Feb 6, 2017
8658417
ErrInvalidType should ignore interfaces
skimata Feb 21, 2017
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1 change: 1 addition & 0 deletions constants.go
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ const (
annotationOmitEmpty = "omitempty"
annotationISO8601 = "iso8601"
annotationSeperator = ","
annotationIgnore = "-"

iso8601TimeFormat = "2006-01-02T15:04:05Z"

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32 changes: 32 additions & 0 deletions node.go
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Expand Up @@ -28,6 +28,38 @@ type Node struct {
Links *Links `json:"links,omitempty"`
}

func (n *Node) merge(node *Node) {
if node.Type != "" {
n.Type = node.Type
}

if node.ID != "" {
n.ID = node.ID
}

if node.ClientID != "" {
n.ClientID = node.ClientID
}

if n.Attributes == nil && node.Attributes != nil {
n.Attributes = make(map[string]interface{})
}
for k, v := range node.Attributes {
n.Attributes[k] = v
}

if n.Relationships == nil && n.Relationships != nil {
n.Relationships = make(map[string]interface{})
}
for k, v := range node.Relationships {
n.Relationships[k] = v
}

if node.Links != nil {
n.Links = node.Links
}
}

// RelationshipOneNode is used to represent a generic has one JSON API relation
type RelationshipOneNode struct {
Data *Node `json:"data"`
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21 changes: 18 additions & 3 deletions request.go
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Expand Up @@ -131,14 +131,28 @@ func unmarshalNode(data *Node, model reflect.Value, included *map[string]*Node)

for i := 0; i < modelValue.NumField(); i++ {
fieldType := modelType.Field(i)
tag := fieldType.Tag.Get("jsonapi")
tag := fieldType.Tag.Get(annotationJSONAPI)

// handles embedded structs
if isEmbeddedStruct(fieldType) {
if shouldIgnoreField(tag) {
continue
}
model := reflect.ValueOf(modelValue.Field(i).Addr().Interface())
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@aren55555 aren55555 Jul 8, 2017

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should be model =

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@skimata skimata Jul 11, 2017

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I think whether I assign to the original argument, or shadow it here, it shouldn't make a difference since the main loop of this function works off of modelValue.

Between assign/overwriting to the original argument vs initializing a new var, I feel like the latter is preferred. But to avoid confusion, I'll pass it directly to unmarshalNode() vs using a shadowed var.

Also, note, w/ handling annotationRelation, we don't overwrite the original model argument. https://github.com/google/jsonapi/blob/master/request.go#L474

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@aren55555 aren55555 Jul 11, 2017

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My gometalinter actually caught this not me :)

err := unmarshalNode(data, model, included)
if err != nil {
er = err
break
}
}

if tag == "" {
continue
}

fieldValue := modelValue.Field(i)

args := strings.Split(tag, ",")
args := strings.Split(tag, annotationSeperator)

if len(args) < 1 {
er = ErrBadJSONAPIStructTag
Expand Down Expand Up @@ -446,7 +460,8 @@ func unmarshalNode(data *Node, model reflect.Value, included *map[string]*Node)
}

// As a final catch-all, ensure types line up to avoid a runtime panic.
if fieldValue.Kind() != v.Kind() {
// Ignore interfaces since interfaces are poly
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@aren55555 aren55555 Jul 8, 2017

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What did you mean by "poly"?

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@skimata skimata Jul 11, 2017

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polymorphic. But if you feel that isn't the correct term, a more accurate comment is welcome.

Why does this matter?
Basically, this "final catch-all" was introduced when I rebased, and it adversely affected our use of use interface{} struct fields as a generic JSON object.

We were doing something like this:

type Model struct {
   Raw  interface{}  `jsonapi:"attr,raw"`
}

...	

json.Unmarshal(jsonByteData, model.Raw)

if fieldValue.Kind() != reflect.Interface && fieldValue.Kind() != v.Kind() {
return ErrInvalidType
}
fieldValue.Set(reflect.ValueOf(val))
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29 changes: 29 additions & 0 deletions response.go
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Expand Up @@ -211,6 +211,21 @@ func visitModelNode(model interface{}, included *map[string]*Node,
for i := 0; i < modelValue.NumField(); i++ {
structField := modelValue.Type().Field(i)
tag := structField.Tag.Get(annotationJSONAPI)

// handles embedded structs
if isEmbeddedStruct(structField) {
if shouldIgnoreField(tag) {
continue
}
model := modelValue.Field(i).Addr().Interface()
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@aren55555 aren55555 Jul 8, 2017

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should be model =...

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@skimata skimata Jul 11, 2017

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see similar comment, I'll pass directly to unmarshalNode()

embNode, err := visitModelNode(model, included, sideload)
if err != nil {
er = err
break
}
node.merge(embNode)
}

if tag == "" {
continue
}
Expand Down Expand Up @@ -517,3 +532,17 @@ func convertToSliceInterface(i *interface{}) ([]interface{}, error) {
}
return response, nil
}

func isEmbeddedStruct(sField reflect.StructField) bool {
if sField.Anonymous && sField.Type.Kind() == reflect.Struct {
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@aren55555 aren55555 Jul 8, 2017

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Can be simplified by returning the comparison; don't need if

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@skimata skimata Jul 11, 2017

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👍

return true
}
return false
}

func shouldIgnoreField(japiTag string) bool {
if strings.HasPrefix(japiTag, annotationIgnore) {
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@aren55555 aren55555 Jul 8, 2017

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Can be simplified by returning the comparison; don't need if

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@skimata skimata Jul 11, 2017

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👍

return true
}
return false
}
202 changes: 201 additions & 1 deletion response_test.go
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Expand Up @@ -6,6 +6,7 @@ import (
"fmt"
"reflect"
"sort"
"strings"
"testing"
"time"
)
Expand Down Expand Up @@ -59,7 +60,7 @@ func (b *Blog) JSONAPIRelationshipLinks(relation string) *Links {
}

type Post struct {
Blog
Blog `jsonapi:"-"`
ID uint64 `jsonapi:"primary,posts"`
BlogID int `jsonapi:"attr,blog_id"`
ClientID string `jsonapi:"client-id"`
Expand Down Expand Up @@ -829,6 +830,205 @@ func TestMarshalMany_InvalidIntefaceArgument(t *testing.T) {
}
}

func TestMergeNode(t *testing.T) {
parent := &Node{
Type: "Good",
ID: "99",
Attributes: map[string]interface{}{"fizz": "buzz"},
}

child := &Node{
Type: "Better",
ClientID: "1111",
Attributes: map[string]interface{}{"timbuk": 2},
}

expected := &Node{
Type: "Better",
ID: "99",
ClientID: "1111",
Attributes: map[string]interface{}{"fizz": "buzz", "timbuk": 2},
}

parent.merge(child)

if !reflect.DeepEqual(expected, parent) {
t.Errorf("Got %+v Expected %+v", parent, expected)
}
}

func TestIsEmbeddedStruct(t *testing.T) {
type foo struct{}

structType := reflect.TypeOf(foo{})
stringType := reflect.TypeOf("")
if structType.Kind() != reflect.Struct {
t.Fatal("structType.Kind() is not a struct.")
}
if stringType.Kind() != reflect.String {
t.Fatal("stringType.Kind() is not a string.")
}

type test struct {
scenario string
input reflect.StructField
expectedRes bool
}

tests := []test{
test{
scenario: "success",
input: reflect.StructField{Anonymous: true, Type: structType},
expectedRes: true,
},
test{
scenario: "wrong type",
input: reflect.StructField{Anonymous: true, Type: stringType},
expectedRes: false,
},
test{
scenario: "not embedded",
input: reflect.StructField{Type: structType},
expectedRes: false,
},
}

for _, test := range tests {
res := isEmbeddedStruct(test.input)
if res != test.expectedRes {
t.Errorf("Scenario -> %s\nGot -> %v\nExpected -> %v\n", test.scenario, res, test.expectedRes)
}
}
}

func TestShouldIgnoreField(t *testing.T) {
type test struct {
scenario string
input string
expectedRes bool
}

tests := []test{
test{
scenario: "opt-out",
input: annotationIgnore,
expectedRes: true,
},
test{
scenario: "no tag",
input: "",
expectedRes: false,
},
test{
scenario: "wrong tag",
input: "wrong,tag",
expectedRes: false,
},
}

for _, test := range tests {
res := shouldIgnoreField(test.input)
if res != test.expectedRes {
t.Errorf("Scenario -> %s\nGot -> %v\nExpected -> %v\n", test.scenario, res, test.expectedRes)
}
}
}

func TestIsValidEmbeddedStruct(t *testing.T) {
type foo struct{}

structType := reflect.TypeOf(foo{})
stringType := reflect.TypeOf("")
if structType.Kind() != reflect.Struct {
t.Fatal("structType.Kind() is not a struct.")
}
if stringType.Kind() != reflect.String {
t.Fatal("stringType.Kind() is not a string.")
}

type test struct {
scenario string
input reflect.StructField
expectedRes bool
}

tests := []test{
test{
scenario: "success",
input: reflect.StructField{Anonymous: true, Type: structType},
expectedRes: true,
},
test{
scenario: "opt-out",
input: reflect.StructField{Anonymous: true, Tag: "jsonapi:\"-\"", Type: structType},
expectedRes: false,
},
test{
scenario: "wrong type",
input: reflect.StructField{Anonymous: true, Type: stringType},
expectedRes: false,
},
test{
scenario: "not embedded",
input: reflect.StructField{Type: structType},
expectedRes: false,
},
}

for _, test := range tests {
res := (isEmbeddedStruct(test.input) && !shouldIgnoreField(test.input.Tag.Get(annotationJSONAPI)))
if res != test.expectedRes {
t.Errorf("Scenario -> %s\nGot -> %v\nExpected -> %v\n", test.scenario, res, test.expectedRes)
}
}
}

func TestMarshalUnmarshalCompositeStruct(t *testing.T) {
type Thing struct {
ID int `jsonapi:"primary,things"`
Fizz string `jsonapi:"attr,fizz"`
Buzz int `jsonapi:"attr,buzz"`
}

type Model struct {
Thing
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@aren55555 aren55555 Jul 8, 2017 •
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I think some additional tests should be added to demonstrate what should happen when fields are overlapping. Ie both have a field w/ primary annotation or an attr with the same name has been used.

That behaviour will become expected by users of this lib; and such tests would ensure we don't break that expectation.

Foo string `jsonapi:"attr,foo"`
Bar string `jsonapi:"attr,bar"`
Bat string `jsonapi:"attr,bat"`
}

model := &Model{}
model.ID = 1
model.Fizz = "fizzy"
model.Buzz = 99
model.Foo = "fooey"
model.Bar = "barry"
model.Bat = "batty"

buf := bytes.NewBuffer(nil)
if err := MarshalOnePayload(buf, model); err != nil {
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@aren55555 aren55555 Jul 8, 2017

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Needs to be updated to MarshalPayload (if you want []byte) or Marshal if you want a Payloader

t.Fatal(err)
}

// assert encoding from model to jsonapi output
expected := `{"data":{"type":"things","id":"1","attributes":{"bar":"barry","bat":"batty","buzz":99,"fizz":"fizzy","foo":"fooey"}}}`
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@aren55555 aren55555 Jul 8, 2017 •
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We should avoid adding string comparisons. Semantic JSON comparison is preferred... could add a test helper method like:

func isJSONEqual(b1, b2 []byte) (result bool, err error) {
	var i1, i2 interface{}
	if err = json.Unmarshal(b1, &i1); err != nil {
		return
	}
	if err = json.Unmarshal(b2, &i2); err != nil {
		return
	}
	result = true
	return
}

actual := strings.TrimSpace(string(buf.Bytes()))

if expected != actual {
t.Errorf("Got %+v Expected %+v", actual, expected)
}

dst := &Model{}
if err := UnmarshalPayload(buf, dst); err != nil {
t.Fatal(err)
}

// assert decoding from jsonapi output to model
if !reflect.DeepEqual(model, dst) {
t.Errorf("Got %#v Expected %#v", dst, model)
}
}

func testBlog() *Blog {
return &Blog{
ID: 5,
Expand Down