fix(nocodb): convert attachment type in api response

packages/nocodb/src/lib/db/sql-data-mapper/lib/sql/BaseModelSqlv2.ts

@@ -99,9 +99,10 @@ class BaseModelSqlv2 {
 
     qb.where(_wherePk(this.model.primaryKeys, id));
 
-    const data = (await this.extractRawQueryAndExec(qb))?.[0];
+    let data = (await this.extractRawQueryAndExec(qb))?.[0];
 
     if (data) {
+      data = this.convertAttachmentType(data);
       const proto = await this.getProto();
       data.__proto__ = proto;
     }
@@ -251,7 +252,8 @@ class BaseModelSqlv2 {
 
     if (!ignoreViewFilterAndSort) applyPaginate(qb, rest);
     const proto = await this.getProto();
-    const data = await this.extractRawQueryAndExec(qb);
+    let data = await this.extractRawQueryAndExec(qb);
+    data = this.convertAttachmentType(data);
 
     return data?.map((d) => {
       d.__proto__ = proto;
@@ -423,7 +425,8 @@ class BaseModelSqlv2 {
           .as('list')
       );
 
-      const children = await this.extractRawQueryAndExec(childQb);
+      let children = await this.extractRawQueryAndExec(childQb);
+      children = this.convertAttachmentType(children);
       const proto = await (
         await Model.getBaseModelSQL({
           id: childTable.id,
@@ -550,7 +553,8 @@ class BaseModelSqlv2 {
 
       await childModel.selectObject({ qb });
 
-      const children = await this.extractRawQueryAndExec(qb);
+      let children = await this.extractRawQueryAndExec(qb);
+      children = this.convertAttachmentType(children);
 
       const proto = await (
         await Model.getBaseModelSQL({
@@ -668,6 +672,7 @@ class BaseModelSqlv2 {
     );
 
     let children = await this.extractRawQueryAndExec(finalQb);
+    children = this.convertAttachmentType(children);
     if (this.isMySQL) {
       children = children[0];
     }
@@ -735,7 +740,8 @@ class BaseModelSqlv2 {
     qb.limit(+rest?.limit || 25);
     qb.offset(+rest?.offset || 0);
 
-    const children = await this.extractRawQueryAndExec(qb);
+    let children = await this.extractRawQueryAndExec(qb);
+    children = this.convertAttachmentType(children);
     const proto = await (
       await Model.getBaseModelSQL({ id: rtnId, dbDriver: this.dbDriver })
     ).getProto();
@@ -1076,7 +1082,8 @@ class BaseModelSqlv2 {
     applyPaginate(qb, rest);
 
     const proto = await childModel.getProto();
-    const data = await this.extractRawQueryAndExec(qb);
+    let data = await this.extractRawQueryAndExec(qb);
+    data = this.convertAttachmentType(data);
 
     return data.map((c) => {
       c.__proto__ = proto;
@@ -1194,7 +1201,8 @@ class BaseModelSqlv2 {
     applyPaginate(qb, rest);
 
     const proto = await parentModel.getProto();
-    const data = await this.extractRawQueryAndExec(qb);
+    let data = await this.extractRawQueryAndExec(qb);
+    data = this.convertAttachmentType(data);
 
     return data.map((c) => {
       c.__proto__ = proto;
@@ -2726,6 +2734,30 @@ class BaseModelSqlv2 {
         )
       : await this.dbDriver.raw(query);
   }
+
+  private convertAttachmentType(data) {
+    // attachment is stored in text and parse in UI
+    // convertAttachmentType is used to convert the response in string to array of object in API response
+    if (data) {
+      const attachmentColumns = this.model.columns.filter(
+        (c) => c.uidt === UITypes.Attachment
+      );
+      if (attachmentColumns.length) {
+        if (!Array.isArray(data)) {
+          data = [data];
+        }
+        data = data.map((d) => {
+          attachmentColumns.forEach((col) => {
+            if (d[col.column_name] && typeof d[col.column_name] === 'string') {
+              d[col.column_name] = JSON.parse(d[col.column_name]);
+            }
+          });
+          return d;
+        });
+      }
+    }
+    return data;
+  }
 }
 
 function extractSortsObject(