feat: handle new user

Author: zernonia

content/sql/handle-new-user.md

@@ -0,0 +1,27 @@
+---
+title: "Handle New User - Function & Trigger"
+description: Insert new user data into another table when event new user signup using Supabase Auth.
+author: zernonia
+github: https://github.com/zernonia
+---
+
+First, create a function `handle_new_user` that return a `trigger`, and save the desired data into `profiles` table. 
+
+```sql
+create or replace function public.handle_new_user() 
+returns trigger as $$
+begin
+ insert into public.profiles (id, avatar_url, full_name)
+ values (new.id, new.raw_user_meta_data->>'avatar_url', new.raw_user_meta_data->>'full_name');
+ return new;
+end;
+$$ language plpgsql security definer;
+```
+
+Now, we will create a trigger `on_auth_user_created` that utilized the function above. It triggers when a new row is insert into `auth.users` table (when new User Signup).
+
+```sql
+create trigger on_auth_user_created
+ after insert on auth.users
+ for each row execute procedure public.handle_new_user();
+```