fix(projects): 短剧项目 - 修复同名创建重试 (#691)

Co-authored-by: tanzui <305375675@.com>

backend/internal/app/project_name_conflict_test.go

@@ -0,0 +1,120 @@
+package app
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+	"net/url"
+	"os"
+	"testing"
+	"time"
+
+	"infinite-canvas/backend/internal/model"
+	"infinite-canvas/backend/internal/repository"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+func TestCreateProjectReturnsStructuredConflictForDuplicateName(t *testing.T) {
+	t.Run("sqlite", func(t *testing.T) {
+		service, db := newProjectSettingsTestService(t)
+		testStructuredProjectNameConflict(t, service, db)
+	})
+	t.Run("postgres", func(t *testing.T) {
+		service, db := newProjectNameConflictPostgresService(t)
+		testStructuredProjectNameConflict(t, service, db)
+	})
+}
+
+// testStructuredProjectNameConflict 验证重名的结构化错误，以及原项目和工作流不会被重复创建请求覆盖。
+func testStructuredProjectNameConflict(t *testing.T, service *Service, db *gorm.DB) {
+	t.Helper()
+	sqlDB, err := db.DB()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := sqlDB.Close(); err != nil {
+			t.Errorf("close test database: %v", err)
+		}
+	})
+	if err := db.AutoMigrate(&model.Project{}, &model.WorkflowTemplateVersion{}, &model.WorkflowInstance{}, &model.WorkflowStepInstance{}); err != nil {
+		t.Fatal(err)
+	}
+
+	request := CreateProjectRequest{Name: "同名短剧", Description: "原项目内容"}
+	first, err := service.CreateProject("user-1", request)
+	if err != nil {
+		t.Fatalf("create initial project: %v", err)
+	}
+
+	request.Description = "重复请求的内容"
+	_, err = service.CreateProject("user-1", request)
+	var conflict *AppError
+	if !errors.As(err, &conflict) {
+		t.Fatalf("duplicate project error = %v, want AppError", err)
+	}
+	if conflict.Status != http.StatusConflict || conflict.Reason != ReasonProjectNameConflict || conflict.Message != "项目名称已存在" {
+		t.Fatalf("duplicate project conflict = %#v", conflict)
+	}
+	var stored model.Project
+	if err := db.First(&stored, "id = ?", first.ID).Error; err != nil {
+		t.Fatal(err)
+	}
+	if stored.Description != first.Description || stored.Revision != first.Revision {
+		t.Fatal("duplicate creation changed the existing project")
+	}
+	var workflowCount int64
+	if err := db.Model(&model.WorkflowInstance{}).Where("project_id = ?", first.ID).Count(&workflowCount).Error; err != nil || workflowCount != 1 {
+		t.Fatalf("workflow count = %d, error = %v", workflowCount, err)
+	}
+	if _, err := service.CreateProject("user-2", request); err != nil {
+		t.Fatalf("same name for another user: %v", err)
+	}
+	request.Name = "同名短剧（2）"
+	if _, err := service.CreateProject("user-1", request); err != nil {
+		t.Fatalf("retry with a new name: %v", err)
+	}
+}
+
+// newProjectNameConflictPostgresService 只在独立测试 schema 中创建项目与工作流表，测试结束后删除该 schema。
+func newProjectNameConflictPostgresService(t *testing.T) (*Service, *gorm.DB) {
+	t.Helper()
+	dsn := os.Getenv("CANVAS_TEST_POSTGRES_DSN")
+	if dsn == "" {
+		t.Skip("CANVAS_TEST_POSTGRES_DSN is not configured")
+	}
+	options := &gorm.Config{Logger: logger.Default.LogMode(logger.Silent)}
+	admin, err := gorm.Open(postgres.Open(dsn), options)
+	if err != nil {
+		t.Fatal(err)
+	}
+	adminSQL, err := admin.DB()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = adminSQL.Close() })
+	schema := fmt.Sprintf("project_name_conflict_app_%d", time.Now().UnixNano())
+	if err := admin.Exec("CREATE SCHEMA " + schema).Error; err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() {
+		if err := admin.Exec("DROP SCHEMA " + schema + " CASCADE").Error; err != nil {
+			t.Error(err)
+		}
+	})
+	parsed, err := url.Parse(dsn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	query := parsed.Query()
+	query.Set("search_path", schema)
+	parsed.RawQuery = query.Encode()
+	db, err := gorm.Open(postgres.Open(parsed.String()), options)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return &Service{repo: repository.New(db)}, db
+}