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backend/src/services/user_service.rs

@@ -0,0 +1,44 @@
+use sea_orm::*;
+use crate::models::user::{self, Entity as User, Model as UserModel};
+use crate::models::family::{Entity as Family};
+
+pub struct UserService;
+
+#[derive(Debug)]
+pub struct LeaveFamilyResult {
+    pub family_deleted: bool,
+}
+
+impl UserService {
+    pub async fn leave_family(db: &DatabaseConnection, user_id: i32) -> Result<LeaveFamilyResult, DbErr> {
+        let user = User::find_by_id(user_id)
+            .one(db)
+            .await?
+            .ok_or(DbErr::RecordNotFound("User not found".to_string()))?;
+
+        let family_id = user.family_id
+            .ok_or(DbErr::Custom("User is not in a family".to_string()))?;
+
+        let mut user_active: user::ActiveModel = user.into();
+        user_active.family_id = Set(None);
+        user_active.update(db).await?;
+
+        let remaining_members = User::find()
+            .filter(user::Column::FamilyId.eq(family_id))
+            .count(db)
+            .await?;
+
+        let family_deleted = if remaining_members == 0 {
+            Family::delete_by_id(family_id).exec(db).await?;
+            true
+        } else {
+            false
+        };
+
+        Ok(LeaveFamilyResult { family_deleted })
+    }
+
+    pub async fn find_by_id(db: &DatabaseConnection, id: i32) -> Result<Option<UserModel>, DbErr> {
+        User::find_by_id(id).one(db).await
+    }
+}