chore: to string

Author: appflowy

collab-database/src/template/relation_parse.rs

@@ -1,4 +1,6 @@
 use crate::entity::FieldType;
+use std::fmt;
+use std::fmt::{Display, Formatter};
 
 use crate::rows::{new_cell_builder, Cell, RowId};
 use crate::template::entity::CELL_DATA;
@@ -12,6 +14,17 @@ pub struct RelationCellData {
   pub row_ids: Vec<RowId>,
 }
 
+impl ToString for RelationCellData {
+  fn to_string(&self) -> String {
+    self
+      .row_ids
+      .iter()
+      .map(|id| id.to_string())
+      .collect::<Vec<_>>()
+      .join(", ")
+  }
+}
+
 impl TypeOptionCellData for RelationCellData {
   fn is_empty(&self) -> bool {
     self.row_ids.is_empty()