Second part of refactor db.Find (#28194)

Continue of #27798 and move more functions to `db.Find` and `db.Count`.

routers/api/v1/repo/milestone.go

@@ -9,10 +9,12 @@ import (
 	"strconv"
 	"time"
 
+	"code.gitea.io/gitea/models/db"
 	issues_model "code.gitea.io/gitea/models/issues"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
 	"code.gitea.io/gitea/modules/timeutil"
+	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 	"code.gitea.io/gitea/services/convert"
@@ -58,14 +60,21 @@ func ListMilestones(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	milestones, total, err := issues_model.GetMilestones(ctx, issues_model.GetMilestonesOption{
+	state := api.StateType(ctx.FormString("state"))
+	var isClosed util.OptionalBool
+	switch state {
+	case api.StateClosed, api.StateOpen:
+		isClosed = util.OptionalBoolOf(state == api.StateClosed)
+	}
+
+	milestones, total, err := db.FindAndCount[issues_model.Milestone](ctx, issues_model.FindMilestoneOptions{
 		ListOptions: utils.GetListOptions(ctx),
 		RepoID:      ctx.Repo.Repository.ID,
-		State:       api.StateType(ctx.FormString("state")),
+		IsClosed:    isClosed,
 		Name:        ctx.FormString("name"),
 	})
 	if err != nil {
-		ctx.Error(http.StatusInternalServerError, "GetMilestones", err)
+		ctx.Error(http.StatusInternalServerError, "db.FindAndCount[issues_model.Milestone]", err)
 		return
 	}