fix: unified default value for select columns

Re #2766

Signed-off-by: mertmit <mertmit99@gmail.com>

packages/nc-gui/components/project/spreadsheet/components/EditColumn.vue

@@ -399,7 +399,7 @@
                                 <v-textarea
                                   v-model="newColumn.cdf"
                                   :label="$t('placeholder.defaultValue')"
-                                  :hint="sqlUi.getDefaultValueForDatatype(newColumn.dt)"
+                                  :hint="defaultValueHint"
                                   persistent-hint
                                   rows="3"
                                   outlined
@@ -586,6 +586,14 @@ export default {
     isDate() {
       return this.newColumn && this.newColumn.uidt === UITypes.Date;
     },
+    defaultValueHint() {
+      if (this.newColumn.uidt === UITypes.MultiSelect) {
+        return 'eg : a,b,c';
+      } else if (this.newColumn.uidt === UITypes.SingleSelect) {
+        return 'eg : a';
+      }
+      return this.sqlUi.getDefaultValueForDatatype(this.newColumn.dt);
+    },
   },
   watch: {
     column() {

packages/nocodb/src/lib/meta/api/columnApis.ts

@@ -513,7 +513,25 @@ export async function columnAdd(req: Request, res: Response<TableType>) {
         if ([UITypes.SingleSelect, UITypes.MultiSelect].includes(colBody.uidt)) {
           const dbDriver = NcConnectionMgrv2.get(base);
           const driverType = dbDriver.clientType();
-          
+          const optionTitles = colBody.colOptions.options.map(el => el.title);
+          // Handle default values
+          if (colBody.cdf) {
+            if (colBody.uidt === UITypes.SingleSelect) {
+              if (!optionTitles.includes(colBody.cdf)) {
+                NcError.badRequest(`Default value '${colBody.cdf}' is not a select option.`);
+              }
+            } else {
+              for (const cdf of colBody.cdf.split(',')) {
+                if (!optionTitles.includes(cdf)) {
+                  NcError.badRequest(`Default value '${cdf}' is not a select option.`);
+                }
+              }
+            }
+            if (driverType === 'pg') {
+              colBody.cdf = `'${colBody.cdf}'`;
+            }
+          }
+
           // Restrict duplicates
           const titles = colBody.colOptions.options.map(el => el.title)
           if (titles
@@ -745,6 +763,21 @@ export async function columnUpdate(req: Request, res: Response<TableType>) {
         op.title = op.title.replace(/^'/, '').replace(/'$/, '')
       }
 
+      // Handle default values
+      if (colBody.cdf) {
+        
+        if (driverType === 'mysql' || driverType === 'mysql2') {
+          
+        } else if (driverType === 'pg') {
+          
+        } else if (driverType === 'mssql') {
+          
+        } else if (driverType === 'sqlite3') {
+          
+        }
+      }
+      
+
       // Restrict duplicates
       const titles = colBody.colOptions.options.map(el => el.title)
       if (titles