How to make slug unique while inserting... not generic

insert.ts

// we use this variable to keep track of the db insertion being successful or not
      let result = null;
      let counter = 0;
      do {
        try {
          // Handle singular item
          const title = newItems.title;
          const slug = slugify(`${title}${counter ? '-' + counter : ''}`, {
            lower: true,
            strict: true,
          });

          result = await this.prisma.postCategory.create({
            data: { title, slug },
          });
        } catch (error) {
          if (error instanceof Prisma.PrismaClientKnownRequestError) {
            if (error.code === 'P2002') {
              // Error code is from prisma docs https://www.prisma.io/docs/reference/api-reference/error-reference
              // Unique constraint fail, increment the counter
              counter++;
            }
          } else {
            // Idk what else could fail it, just throw the error
            throw e;
          }
        }
      } while (!result && counter < 10); // loop while result is null and counter is less than 10
      return result;