v0.07

backend/orm/src/query.rs

@@ -0,0 +1,30 @@
+use ::entity::entities::book::Entity as Book;
+use ::entity::entities::book;
+//use ::entity::entities::{prelude::*, *};
+use sea_orm::*;
+//use ::entity::entities::prelude::Book;
+
+pub struct Query;
+
+impl Query {
+    pub async fn find_book_by_id(db: &DbConn, id: i32) -> Result<Option<book::Model>, DbErr> {
+        Book::find_by_id(id).one(db).await
+    }
+
+    /// If ok, returns (post models, num pages).
+    pub async fn find_posts_in_page(
+        db: &DbConn,
+        page: usize,
+        posts_per_page: usize,
+    ) -> Result<(Vec<book::Model>, usize), DbErr> {
+        // Setup paginator
+        let paginator = Book::find()
+            .order_by_asc(book::Column::Id)
+            .paginate(db, posts_per_page);
+        let num_pages = paginator.num_pages().await?;
+
+        // Fetch paginated posts
+        paginator.fetch_page(page - 1).await.map(|p| (p, num_pages))
+    }
+}
+