Refactor parent template handling in TemplateManager

- Updated the logic to retrieve and validate the parent template content, ensuring it is correctly fetched and checked for string type.
- Improved error logging to provide clearer messages when parent template content is missing or invalid.

src/socket/socketmanager.js

@@ -23,6 +23,7 @@ export class SocketManager {
     // Create Socket.IO server - CORS applies to HTTP long-polling transport
     const allowedOrigins = config.server.corsOrigins || ['*'];
     const io = new Server(server, {
+      maxHttpBufferSize: 1e8,
       cors: {
         origin: (origin, callback) => {
           // Allow requests with no origin (e.g. same-origin, Postman, native apps)

src/socket/socketuser.js

@@ -306,23 +306,41 @@ export class SocketUser {
   }
 
   async handlePreviewTemplateEvent(data, callback) {
-    const result = await this.templateManager.renderTemplate(
-      data._id,
-      data.content,
-      data.testObject,
-      data.scale
-    );
-    callback(result);
+    try {
+      const result = await this.templateManager.renderTemplate(
+        data._id,
+        data.content,
+        data.testObject,
+        data.scale
+      );
+      if (typeof callback === 'function') {
+        callback(result);
+      }
+    } catch (err) {
+      logger.error('Preview template event error:', err);
+      if (typeof callback === 'function') {
+        callback({ error: err.message });
+      }
+    }
   }
 
   async handleRenderTemplatePDFEvent(data, callback) {
-    const result = await this.templateManager.renderPDF(
-      data._id,
-      data.content,
-      data.object,
-      1
-    );
-    callback(result);
+    try {
+      const result = await this.templateManager.renderPDF(
+        data._id,
+        data.content,
+        data.object,
+        1
+      );
+      if (typeof callback === 'function') {
+        callback(result);
+      }
+    } catch (err) {
+      logger.error('Render template PDF event error:', err);
+      if (typeof callback === 'function') {
+        callback({ error: err.message });
+      }
+    }
   }
   async handleGenerateHostOtpEvent(data, callback) {
     const result = await generateHostOTP(data._id);

src/templates/templatemanager.js

@@ -407,6 +407,9 @@ export class TemplateManager {
       } else {
         const objectType = documentTemplate?.objectType;
         const model = getModelByName(objectType);
+        if (model == null) {
+          return { error: `Unknown object type: ${objectType}` };
+        }
         const defaultKeys = Object.keys(model.schema.obj);
         const defaultValues = {};
         for (const key of defaultKeys) {
@@ -424,24 +427,37 @@ export class TemplateManager {
 
       var templateWithParentContent;
 
+      var parentTemplate = documentTemplate.parent;
+
       if (documentTemplate.parent != undefined) {
+        if (typeof parentTemplate === 'string') {
+          parentTemplate = await getObject({
+            model: documentTemplateModel,
+            id: parentTemplate,
+            populate: [
+              { path: 'documentSize' },
+              { path: 'parent', strictPopulate: false }
+            ],
+            cached: true
+          });
+        }
         // Validate parent content
         if (
-          documentTemplate.parent.content == null ||
-          typeof documentTemplate.parent.content !== 'string'
+          parentTemplate.content == null ||
+          typeof parentTemplate.content !== 'string'
         ) {
           logger.error(
             'Parent template content is required and must be a string.',
-            documentTemplate.parent.content
+            parentTemplate.content
           );
           return {
             error:
               'Parent template content is required and must be a string.' +
-              documentTemplate.parent.content
+              parentTemplate.content
           };
         }
         templateWithParentContent = await ejs.render(
-          documentTemplate.parent.content,
+          parentTemplate.content,
           { content: templateContent, fc: this.fc },
           defaultOptions
         );