feat: bal and user permission checks

src/entities/bal.rs

@@ -0,0 +1,37 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq, Serialize, Deserialize, utoipa::ToSchema)]
+#[sea_orm(table_name = "BAL")]
+#[schema(title="Book", as=entities::BAL)]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = true)]
+    pub id: u32,
+    pub user_id: u32,
+    pub name: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(has_many = "super::book_instance::Entity")]
+    BookInstance,
+}
+
+impl Related<super::book_instance::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::BookInstance.def()
+    }
+}
+
+impl Entity {
+    pub async fn get_by_id<C>(db_conn: &C, id: u32) -> Option<Model>
+        where C: ConnectionTrait,
+    {
+        match Self::find_by_id(id).one(db_conn).await {
+            Ok(res) => res,
+            Err(_) => None
+        }
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}