コメント周りのAPIを実装

model/comments.go

@@ -1,5 +1,7 @@
 package model
 
+import "fmt"
+
 type Comment struct {
 	GormModel
 	ItemID  int    `gorm:"type:int;not null" json:"item_id"`
@@ -10,3 +12,30 @@ type Comment struct {
 func (Comment) TableName() string {
 	return "comments"
 }
+
+type CreateCommentPayload struct {
+	ItemID  int    `json:"item_id"`
+	UserID  string `json:"user_id"`
+	Comment string `json:"comment"`
+}
+
+func CreateComment(p *CreateCommentPayload) (*Comment, error) {
+	if p.ItemID == 0 {
+		return nil, fmt.Errorf("ItemID is required")
+	}
+	if p.UserID == "" {
+		return nil, fmt.Errorf("UserID is required")
+	}
+	if p.Comment == "" {
+		return nil, fmt.Errorf("Comment is required")
+	}
+	c := &Comment{
+		ItemID:  p.ItemID,
+		UserID:  p.UserID,
+		Comment: p.Comment,
+	}
+	if err := db.Create(c).Error; err != nil {
+		return nil, err
+	}
+	return c, nil
+}

model/comments_test.go

@@ -0,0 +1,63 @@
+package model
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCreateComment(t *testing.T) {
+	PrepareTestDatabase()
+
+	cases := []struct {
+		name    string
+		payload *CreateCommentPayload
+		fail    bool
+	}{
+		{
+			name: "正常系",
+			payload: &CreateCommentPayload{
+				ItemID:  1,
+				UserID:  "user1",
+				Comment: "comment1",
+			},
+			fail: false,
+		},
+		{
+			name: "異常系: ItemIDが存在しない",
+			payload: &CreateCommentPayload{
+				UserID:  "user1",
+				Comment: "comment1",
+			},
+			fail: true,
+		},
+		{
+			name: "異常系: UserIDが存在しない",
+			payload: &CreateCommentPayload{
+				ItemID:  1,
+				Comment: "comment1",
+			},
+			fail: true,
+		},
+		{
+			name: "異常系: Commentが存在しない",
+			payload: &CreateCommentPayload{
+				ItemID: 1,
+				UserID: "user1",
+			},
+			fail: true,
+		},
+	}
+
+	assert := assert.New(t)
+	for _, tt := range cases {
+		t.Run(tt.name, func(t *testing.T) {
+			_, err := CreateComment(tt.payload)
+			if tt.fail {
+				assert.Error(err)
+			} else {
+				assert.NoError(err)
+			}
+		})
+	}
+}

router/comments.go

@@ -1,12 +1,48 @@
 package router
 
 import (
-	"net/http"
+	"fmt"
+	"strconv"
 
 	"github.com/labstack/echo/v4"
+	"github.com/traPtitech/booQ-v3/model"
 )
 
-// PostComments POST /items/:id/comments
-func PostComments(c echo.Context) error {
-	return echo.NewHTTPError(http.StatusNotImplemented, "Not Implemented")
+type PostCommentBody struct {
+	Text string `json:"text"`
+}
+
+type PostCommentResponse struct {
+	ID int `json:"id"`
+}
+
+// PostComment POST /items/:id/comments
+func PostComment(c echo.Context) error {
+	itemIDRaw := c.Param("id")
+	itemID, err := strconv.Atoi(itemIDRaw)
+	if err != nil {
+		return invalidRequest(c, err)
+	}
+
+	me := getAuthorizedUser(c)
+
+	var body PostCommentBody
+	if err := c.Bind(&body); err != nil {
+		return invalidRequest(c, err)
+	}
+	if body.Text == "" {
+		return invalidRequest(c, fmt.Errorf("text is empty"))
+	}
+
+	payload := model.CreateCommentPayload{
+		ItemID:  itemID,
+		UserID:  me,
+		Comment: body.Text,
+	}
+	comment, err := model.CreateComment(&payload)
+	if err != nil {
+		return internalServerError(c, err)
+	}
+
+	return c.JSON(201, PostCommentResponse{ID: comment.ID})
 }

router/comments_test.go

@@ -0,0 +1,46 @@
+package router
+
+import (
+	"testing"
+
+	"github.com/labstack/echo/v4"
+	"github.com/stretchr/testify/assert"
+	"github.com/traPtitech/booQ-v3/model"
+)
+
+func TestPostComment(t *testing.T) {
+	model.PrepareTestDatabase()
+
+	e := echo.New()
+	SetupRouting(e, CreateUserProvider("s9"))
+
+	cases := []struct {
+		name     string
+		payload  string
+		expected int
+	}{
+		{
+			name:     "正常系",
+			payload:  `{"text":"テストコメント"}`,
+			expected: 201,
+		},
+		{
+			name:     "異常系: 空文字列",
+			payload:  `{"text":""}`,
+			expected: 400,
+		},
+		{
+			name:     "異常系: パラメータ不足",
+			payload:  `{}`,
+			expected: 400,
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			assert := assert.New(t)
+			rec := PerformMutation(e, "POST", "/api/items/1/comments", tc.payload)
+			assert.Equal(tc.expected, rec.Code)
+		})
+	}
+}

router/router.go

@@ -27,7 +27,7 @@ func SetupRouting(e *echo.Echo, client *UserProvider) {
 			apiItems.POST("/:id/owners", PostOwners)
 			apiItems.PATCH("/:id/owners/:ownershipid", PatchOwners)
 			apiItems.DELETE("/:id/owners/:ownershipid", DeleteOwners)
-			apiItems.POST("/:id/comments", PostComments)
+			apiItems.POST("/:id/comments", PostComment)
 			apiItems.POST("/:id/likes", PostLikes)
 			apiItems.DELETE("/:id/likes", DeleteLikes)
 

router/test_common.go

@@ -0,0 +1,16 @@
+package router
+
+import (
+	"net/http/httptest"
+	"strings"
+
+	"github.com/labstack/echo/v4"
+)
+
+func PerformMutation(e *echo.Echo, method, path, payload string) *httptest.ResponseRecorder {
+	req := httptest.NewRequest(method, path, strings.NewReader(payload))
+	req.Header.Set("Content-Type", "application/json")
+	rec := httptest.NewRecorder()
+	e.ServeHTTP(rec, req)
+	return rec
+}