Create view to load memberships

geneit_backend/migrations/2023-05-24-102711_create_users/down.sql

@@ -1,4 +1,5 @@
 -- This file should undo anything in `up.sql`
+drop view if exists families_memberships ;
 DROP table IF EXISTS memberships ;
 DROP table IF EXISTS families;
 DROP table IF EXISTS users;

geneit_backend/migrations/2023-05-24-102711_create_users/up.sql

@@ -28,4 +28,44 @@ CREATE TABLE memberships (
     is_admin BOOLEAN NOT NULL DEFAULT FALSE,
 
     PRIMARY KEY(user_id, family_id)
-);
+);
+
+-- Create views
+create view
+	families_memberships
+as
+select
+	m.user_id ,
+	m.family_id,
+	m.is_admin ,
+	f."name",
+	f.time_create,
+	f.invitation_code,
+	cm.num as count_members,
+	ca.num as count_admins
+from
+	memberships m
+left join families f on
+	f.id = m.family_id
+	-- count members
+left join (
+	select
+		family_id ,
+		count(*) as num
+	from
+		memberships m
+	group by
+		family_id) cm on
+	cm.family_id = m.family_id
+	-- count admins
+left join (
+	select
+		family_id ,
+		count(*) as num
+	from
+		memberships m
+	where
+		m.is_admin = true
+	group by
+		family_id) ca on
+	ca.family_id = m.family_id