Copy fields value from source to target Record (#1726)

* Create script.js

* Create README.md

* Update README.md

Author: naveensnow

Server-Side Components/Background Scripts/Copy Field Values and Insert in Target Record/README.md

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+
+Script Usage :
+
+This function takes the parameters such as source table, source record sys_id, target table, fields that needs to be copied to target table.
+
+As a validation check, the fields from source table should be similar to target else abort inserting the record.
+
+
+Same Code to invoke the function: 
+copyFieldsValidated(
+    'dmn_demand',
+    '8c10306edbc00810f777526adc961976',
+    'pm_project',
+    ['name', 'short_description']   //will throw error since name field not common in both tables
+);
+
+
+copyFieldsValidated(
+    'dmn_demand',
+    '8c10306edbc00810f777526adc961976',
+    'pm_project',
+    ['short_description']   //Insert the record since short_description is common in both tables
+);

Server-Side Components/Background Scripts/Copy Field Values and Insert in Target Record/script.js

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+/**
+ * Copies specified fields from a source record to a newly created target record,
+ * validating all fields before performing the insert operation.
+ *
+ * @param {string} sourceTable - The name of the source table.
+ * @param {string} sourceId - The sys_id of the source record.
+ * @param {string} targetTable - The name of the target table.
+ * @param {string[]} fields - An array of field names to copy.
+ * @returns {string|null} The sys_id of the newly created target record, or null on failure.
+ */
+function copyFieldsValidated(sourceTable, sourceId, targetTable, fields) {
+    var src = new GlideRecord(sourceTable);
+    if (!src.get(sourceId)) {
+        gs.error("Source record not found in " + sourceTable + " with sys_id: " + sourceId);
+        return null;
+    }
+
+    var tgt = new GlideRecord(targetTable);
+    tgt.initialize();
+    var allFieldsAreValid = true;
+    // First, validate all fields before doing any work
+    fields.forEach(function(f) {
+        if (!src.isValidField(f) || !tgt.isValidField(f)) {
+            gs.warn("Field [" + f + "] is not valid in both " + sourceTable + " and " + targetTable + ". Aborting insert.");
+            allFieldsAreValid = false;
+        }
+    });
+
+    // Proceed with copying and inserting only if all fields are valid
+    if (allFieldsAreValid) {
+        fields.forEach(function(f) {
+            tgt.setValue(f, src.getValue(f));
+        });
+        var newId = tgt.insert();
+        if (newId) {
+            gs.info("Record copied from " + sourceTable + " → " + targetTable + ". New sys_id: " + newId);
+            return newId;
+        } else {
+            gs.error("Failed to insert new record into " + targetTable);
+            return null;
+        }
+    } else {
+        gs.error("Aborting record insert due to invalid fields.");
+        return null;
+    }
+}