marshal embedded payload now takes io rather than return struct

examples/app.go

@@ -28,10 +28,8 @@ func main() {
 	})
 
 	blog := testBlogForCreate()
-	payload, _ := jsonapi.MarshalOnePayloadEmbedded(blog)
-
 	in := bytes.NewBuffer(nil)
-	json.NewEncoder(in).Encode(payload)
+	jsonapi.MarshalOnePayloadEmbedded(in, blog)
 
 	req, _ := http.NewRequest("POST", "/blogs", in)
 

request_test.go

@@ -93,6 +93,35 @@ func TestUnmarshalNestedRelationships(t *testing.T) {
 	}
 }
 
+func TestUnmarshalNestedRelationshipsEmbedded(t *testing.T) {
+	out := bytes.NewBuffer(nil)
+	if err := MarshalOnePayloadEmbedded(out, testModel()); err != nil {
+		t.Fatal(err)
+	}
+
+	model := new(Blog)
+
+	if err := UnmarshalPayload(out, model); err != nil {
+		t.Fatal(err)
+	}
+
+	if model.CurrentPost == nil {
+		t.Fatalf("Current post was not materialized")
+	}
+
+	if model.CurrentPost.Comments == nil {
+		t.Fatalf("Did not materialize nested records, comments")
+	}
+
+	if len(model.CurrentPost.Comments) != 2 {
+		t.Fatalf("Wrong number of comments")
+	}
+
+	if model.CurrentPost.Comments[0].Body != "foo" {
+		t.Fatalf("Comment body not set")
+	}
+}
+
 func TestUnmarshalRelationshipsSideloaded(t *testing.T) {
 	payload := samplePayloadWithSideloaded()
 	out := new(Blog)
@@ -235,8 +264,8 @@ func samplePayloadWithId() io.Reader {
 	return out
 }
 
-func samplePayloadWithSideloaded() io.Reader {
-	testModel := &Blog{
+func testModel() *Blog {
+	return &Blog{
 		Id:        5,
 		Title:     "Title 1",
 		CreatedAt: time.Now(),
@@ -288,6 +317,10 @@ func samplePayloadWithSideloaded() io.Reader {
 			},
 		},
 	}
+}
+
+func samplePayloadWithSideloaded() io.Reader {
+	testModel := testModel()
 
 	out := bytes.NewBuffer(nil)
 	MarshalOnePayload(out, testModel)

response.go

@@ -76,16 +76,19 @@ func MarshalManyPayload(w io.Writer, models Models) error {
 	return nil
 }
 
-func MarshalOnePayloadEmbedded(model interface{}) (*OnePayload, error) {
+func MarshalOnePayloadEmbedded(w io.Writer, model interface{}) error {
 	rootNode, _, err := visitModelNode(model, false)
 	if err != nil {
-		return nil, err
+		return err
 	}
 
-	resp := &OnePayload{Data: rootNode}
+	payload := &OnePayload{Data: rootNode}
 
-	return resp, nil
+	if err := json.NewEncoder(w).Encode(payload); err != nil {
+		return err
+	}
 
+	return nil
 }
 
 func visitModelNode(model interface{}, sideload bool) (*Node, []*Node, error) {