Added validation and automated short key to create unit master

app/controllers/unitMasterController.js

@@ -8,6 +8,88 @@ const csv = require("csv-parser");
 //  Create new Unit
 exports.createUnit = async (req, res) => {
   try {
+    const { uom } = req.body;
+
+    if (!uom || typeof uom !== "string" || !uom.trim()) {
+      return res.status(400).json({
+        status: "error",
+        message: "UOM (Unit Name) is required and must be a non-empty string.",
+      });
+    }
+    const cleaned = uom.replace(/[^a-zA-Z]/g, "").toUpperCase();
+    if (!cleaned) {
+      return res.status(400).json({
+        status: "error",
+        message: "UOM must contain at least one letter (A-Z).",
+      });
+    }
+    const existingUOM = await UnitMaster.findOne({
+      where: Sequelize.where(
+        Sequelize.fn("LOWER", Sequelize.col("uom")),
+        uom.toLowerCase()
+      ),
+    });
+
+    if (existingUOM)
+      return res.status(400).json({
+        status: "error",
+        message: `Unit '${uom}' already exists with short key '${existingUOM.uom_short_name}'.`,
+      });
+
+    //Generate short name (same rule as CSV)
+    const abbreviationMap = {
+      METER: "MT",
+      METRE: "MT",
+      KILOGRAM: "KG",
+      GRAM: "GM",
+      LITER: "LTR",
+      LITRE: "LTR",
+      CENTIMETER: "CM",
+      MILLIMETER: "MM",
+      SECOND: "SEC",
+      MINUTE: "MIN",
+      HOUR: "HR",
+      DAY: "DAY",
+      PIECE: "PC",
+      BOX: "BX",
+      USER: "USR",
+      ITEM: "ITM",
+      UNIT: "UNT",
+    };
+
+    let uomShort;
+
+    if (cleaned.length <= 5) {
+      uomShort = cleaned;
+    } else {
+      // If >5 letters, use abbreviation or auto-generate
+      const baseShort = abbreviationMap[cleaned] || cleaned.substring(0, 3);
+      const randomLetters = () =>
+        Array.from({ length: 2 }, () =>
+          String.fromCharCode(65 + Math.floor(Math.random() * 26))
+        ).join("");
+      uomShort = `${baseShort}${randomLetters()}`.substring(0, 5);
+    }
+
+    let exists = await UnitMaster.findOne({
+      where: Sequelize.where(
+        Sequelize.fn("LOWER", Sequelize.col("uom_short_name")),
+        uomShort.toLowerCase()
+      ),
+    });
+
+    while (exists) {
+      const randomSuffix = Math.random().toString(36).substring(2, 3).toUpperCase();
+      uomShort = (uomShort.substring(0, 4) + randomSuffix).substring(0, 5);
+      exists = await UnitMaster.findOne({
+        where: Sequelize.where(
+          Sequelize.fn("LOWER", Sequelize.col("uom_short_name")),
+          uomShort.toLowerCase()
+        ),
+      });
+    }
+    req.body.uom_short_name = uomShort;
+    
     const unit = await UnitMaster.create(req.body);
     res.status(201).json({ status: "success", data: unit });
   } catch (err) {