added condition for checking existign channel partner with the given reara number

src/api/channel-partner/controllers/channel-partner.js

-'use strict';
+"use strict";
 
 /**
  * channel-partner controller
  */
 
-const { createCoreController } = require('@strapi/strapi').factories;
+const { createCoreController } = require("@strapi/strapi").factories;
 
-module.exports = createCoreController('api::channel-partner.channel-partner');
+module.exports = createCoreController(
+  "api::channel-partner.channel-partner",
+  ({ strapi: Strapi }) => ({
+    async create(ctx) {
+      //   const currentChannelPartner = ctx.state.user;
+          const reraNumber = ctx.request.body?.data?.reraNumber;
+          console.log(`Rera Number  ${reraNumber}`);
+      if (!reraNumber) {
+       return ctx.bad(`Please specify your rera number.`);
+      }
+
+      // 1. check if the channel  partner already  exist
+      const existingChannelPartner = await strapi.entityService.findMany(
+        "api::channel-partner.channel-partner",
+        {
+          filters: { reraNumber: reraNumber },
+        }
+      );
+          console.log('Existing Channel Partner');
+          console.log(existingChannelPartner);
+      if (existingChannelPartner && existingChannelPartner.length !== 0) {
+       return ctx.badRequest(
+          `Channel Partner Already Exist with the Given rera number ${reraNumber}`
+        );
+      }
+
+      return await super.create(ctx);
+    },
+  })
+);