Answer for Mission 1-1

original/assets/js/app.js

@@ -115,7 +115,7 @@
             const index = this.messages.findIndex(m => {
               return m.id === updatedMessage.id
             })
-            Vue.set(this.messages, index, updatedMessage)
+            Vue.set(this.messages, index, response.result)
         })
       },
       clearMessage() {

original/controller/message.go

@@ -4,6 +4,7 @@ import (
 	"database/sql"
 	"errors"
 	"net/http"
+	"strconv"
 
 	"github.com/VG-Tech-Dojo/vg-1day-2018-06-10/original/httputil"
 	"github.com/VG-Tech-Dojo/vg-1day-2018-06-10/original/model"
@@ -96,7 +97,34 @@ func (m *Message) Create(c *gin.Context) {
 func (m *Message) UpdateByID(c *gin.Context) {
 	// Mission 1-1. メッセージを編集しよう
 	// ...
-	c.JSON(http.StatusCreated, gin.H{})
+       var msg model.Message
+
+       if err := c.BindJSON(&msg); err != nil {
+               resp := httputil.NewErrorResponse(err)
+               c.JSON(http.StatusInternalServerError, resp)
+               return
+       }
+
+       i := c.Param("id")
+       id, err := strconv.ParseInt(i, 10, 64)
+       if err != nil {
+               resp := httputil.NewErrorResponse(err)
+               c.JSON(http.StatusBadRequest, resp)
+               return
+       }
+
+       msg.ID = id
+       updated, err := msg.Update(m.DB)
+       if err != nil {
+               resp := httputil.NewErrorResponse(err)
+               c.JSON(http.StatusInternalServerError, resp)
+               return
+       }
+
+       c.JSON(http.StatusOK, gin.H{
+               "result": updated,
+               "error":  nil,
+       })
 }
 
 // DeleteByID は...

original/model/message.go

@@ -2,6 +2,7 @@ package model
 
 import (
 	"database/sql"
+	"strconv"
 )
 
 // Message はメッセージの構造体です
@@ -70,6 +71,20 @@ func (m *Message) Insert(db *sql.DB) (*Message, error) {
 
 // Mission 1-1. メッセージを編集しよう
 // ...
+func (m *Message) Update(db *sql.DB) (*Message, error) {
+       _, err := db.Exec(`UPDATE message SET body=?  WHERE id = ?`, m.Body, m.ID)
+       if err != nil {
+               return nil, err
+       }
+
+       id := strconv.FormatInt(m.ID, 10)
+       msg, err := MessageByID(db, id)
+       if err != nil {
+               return nil, err
+       }
+
+       return msg, nil
+}
 
 // Mission 1-2. メッセージを削除しよう
 // ...