eggjs 使用 sequelize 的事务无法插入数据

async create(
    userId,
    title,
    content,
    subjectId,
    type,
    categoryId,
    coverImageUrl,
    tags,
    published
  ) {
    const ctx = this.ctx;
    let transaction;

    try {
      transaction = await ctx.model.transaction();

      const post = await ctx.model.Post.create(
        {
          author_id: userId,
          title,
          content,
          type,
          category_id: categoryId,
          cover_image_url: coverImageUrl,
          subject_id: subjectId,
          published,
          created_at: new Date(),
          updated_at: null,
          deleted_at: null,
          length: 2,
          render_content: "",
          subtitle: "",
          leading_text: ""
        },
        { transaction }
      );

      const postId = post && post.getDataValue("id");

      if (!postId) {
        throw new Error();
      }

      const tagIds = [];

      for (const tagName of tags) {
        const result = await ctx.model.Tag.findOrCreate({
          where: { name: tagName },
          transaction
        });

        tagIds.push(result[0].dataValues["id"]);
      }

      for (const tagId of tagIds) {
        await ctx.model.PostTag.create(
          { post_id: postId, tag_id: tagId },
          { transaction }
        );
      }

      await transaction.commit();

      return { success: true, data: { postId } };
    } catch (e) {
      console.log(e);
      await transaction.rollback();
      return { success: false, message: "服务器异常" };
    }
  }

没有提示错误，接口可以返回 postId，但查数据库后，数据根本没插进去，请问是什么原因呢？