migrate from github

internal/repository/user_repo/get_by_id.go

@@ -0,0 +1,37 @@
+package user_repo
+
+import (
+	"github.com/XingfenD/yoresee_doc/internal/model"
+	"gorm.io/gorm"
+)
+
+type UserGetByIDOperation struct {
+	repo *UserRepository
+	id   int64
+	tx   *gorm.DB
+}
+
+func (r *UserRepository) GetByID(id int64) *UserGetByIDOperation {
+	return &UserGetByIDOperation{
+		repo: r,
+		id:   id,
+	}
+}
+
+func (op *UserGetByIDOperation) WithTx(tx *gorm.DB) *UserGetByIDOperation {
+	op.tx = tx
+	return op
+}
+
+func (op *UserGetByIDOperation) Exec() (*model.User, error) {
+	var user model.User
+	var err error
+
+	if op.tx != nil {
+		err = op.tx.First(&user, op.id).Error
+	} else {
+		err = op.repo.db.First(&user, op.id).Error
+	}
+
+	return &user, err
+}