Keep manager when morphing groups

app/features/sendouq/queries/morphGroups.server.ts

@@ -1,6 +1,14 @@
 import { nanoid } from "nanoid";
 import { sql } from "~/db/sql";
 import { deleteLikesByGroupId } from "./deleteLikesByGroupId.server";
+import type { GroupMember, User } from "~/db/types";
+
+const findToBeDeletedGroupNonRegularsStm = sql.prepare(/* sql */ `
+  select "userId"
+  from "GroupMember"
+  where "groupId" = @groupId
+    and "role" != 'REGULAR'
+`);
 
 const deleteGroupStm = sql.prepare(/* sql */ `
   delete from "Group"
@@ -35,6 +43,10 @@ export const morphGroups = sql.transaction(
     newMembers: number[];
     addChatCode: boolean;
   }) => {
+    const toBeDeletedGroupNonRegulars = findToBeDeletedGroupNonRegularsStm
+      .all({ groupId: otherGroupId })
+      .map((row: any) => row.userId) as Array<User["id"]>;
+
     deleteGroupStm.run({ groupId: otherGroupId });
     deleteGroupMapsStm.run({ groupId: otherGroupId });
 
@@ -49,10 +61,15 @@ export const morphGroups = sql.transaction(
     }
 
     for (const userId of newMembers) {
+      const role: GroupMember["role"] = toBeDeletedGroupNonRegulars.includes(
+        userId,
+      )
+        ? "MANAGER"
+        : "REGULAR";
       addGroupMemberStm.run({
         groupId: survivingGroupId,
         userId,
-        role: "REGULAR",
+        role,
       });
     }
   },