How to `validateInput` in a custom `create` `controller`?

Discord Q&A strapi-questions
1

I am creating my own controller to create an entry. It will make use of database transaction, to create the entry only when the existing count is smaller than a number. I want the field validation feature (checking if the required fields exist, data-type is correct, etc). I have put validateInput() but it does not work. Even I have ignored some required fields, it threw no error.

Below is my source code:

'use strict';

const quota = require("../../../utils/quota");
const {createCoreController} = require('@strapi/strapi').factories;

module.exports = createCoreController(
  'api::campaign-202408-public.campaign-202408-public',
  ({strapi}) => ({
    async create(ctx) {
      try {
        await this.validateInput(ctx.request.body.data, ctx);

        const trx = await strapi.db.transaction();
        try {
          const count = await strapi.query('api::campaign-202408-public.campaign-202408-public').count({
            populate: {
              Form: {
                filters: {
                  PopUpDate: ctx.request.body.data.PopUpDate,
                  PopUpTime: ctx.state.popup_time,
                }
              }
            },
          });

          console.log('COUNT', count);

          const sanitized_data = await this.sanitizeInput(ctx.request.body.data, ctx);
          const result = await strapi.query('api::campaign-202408-public.campaign-202408-public').create(
            {
              data: sanitized_data,
              transaction: trx,
            }
          );

          await trx.commit();

          const sanitized_result = await this.sanitizeOutput(result, ctx);
          return this.transformResponse(sanitized_result);
        } catch (err) {
          await trx.rollback();
          throw err;
        }
      } catch (err) {
        return ctx.badRequest(err.message);
      }
    },
  }),
);

Thanks.

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