feat: book return and bal stats

src/entities/bal.rs

@@ -34,6 +34,8 @@ where C: ConnectionTrait {
 pub enum Relation {
     #[sea_orm(has_many = "super::book_instance::Entity")]
     BookInstance,
+    #[sea_orm(has_one = "super::bal_stats::Entity")]
+    BalStats,
 }
 
 impl Related<super::book_instance::Entity> for Entity {

src/entities/bal_stats.rs

@@ -0,0 +1,38 @@
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize, utoipa::ToSchema)]
+#[sea_orm(table_name = "BALStats")]
+#[schema(title="BalStats", as=entities::BALStats)]
+pub struct Model {
+    #[sea_orm(primary_key, auto_increment = true)]
+    #[serde(skip_serializing)]
+    id: u32,
+    pub bal_id: u32,
+
+    pub total_owned_sold_books: u32,
+    pub total_sold_books: u32,
+
+    pub total_owned_collected_money: f32,
+    pub total_collected_money: f32,
+
+    pub total_different_owners: u32,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::bal::Entity",
+        from = "Column::BalId",
+        to = "super::bal::Column::Id"
+    )]
+    Bal,
+}
+
+impl Related<super::bal::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Bal.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}

src/entities/mod.rs

@@ -1,6 +1,7 @@
 pub mod prelude;
 
 pub mod bal;
+pub mod bal_stats;
 pub mod book;
 pub mod book_instance;
 pub mod owner;

src/entities/prelude.rs

@@ -1,5 +1,6 @@
 
 pub use super::bal::Entity as Bal;
+pub use super::bal_stats::Entity as BalStats;
 pub use super::book::Entity as Book;
 pub use super::book_instance::Entity as BookInstance;
 pub use super::owner::Entity as Owner;