uses tips from diesel.rs guide for application integration

lootalot_db/src/lib.rs

@@ -6,35 +6,24 @@ extern crate serde_derive;
 
 use diesel::prelude::*;
 use diesel::r2d2::{self, ConnectionManager};
+// Convenience re-export, maybe DbApi should me move here instead ??
+pub use diesel::query_dsl::RunQueryDsl;
 
-pub mod models;
-pub mod schema;
+mod models;
+mod schema;
+
+pub use models::Item;
+pub use models::Player;
 
 pub type DbConnection = SqliteConnection;
 pub type Pool = r2d2::Pool<ConnectionManager<DbConnection>>;
 pub type QueryResult<T> = Result<T, diesel::result::Error>;
 pub type ActionResult = QueryResult<bool>;
 
-pub use models::Item;
-pub use models::Player;
-
 impl Player {
     /// Query the list of all players
     pub fn fetch_list(conn: &SqliteConnection) -> QueryResult<Vec<Self>> {
-        use schema::players::dsl::*;
-        Ok( players
-                .load::<Self>(conn)?
-        )
-    }
-
-    /// Query the list of items belonging to player
-    pub fn fetch_loot(player_id: i32, conn: &SqliteConnection) -> QueryResult<Vec<Item>> {
-        use schema::looted::dsl::*;
-        Ok( looted
-                .filter(owner_id.eq(player_id))
-                .select((id, name, base_price))
-                .load::<Item>(conn)?
-        )
+        Ok( schema::players::table.load::<Self>(conn)? )
     }
 
     pub fn action_claim_object(player_id: i32, item_id: i32, conn: &DbConnection) -> ActionResult {
@@ -48,8 +37,8 @@ impl Player {
 
 
 pub fn create_pool() -> Pool {
-    dbg!(dotenv::dotenv().ok());
     let connspec = std::env::var("DATABASE_URL").expect("DATABASE_URL");
+    dbg!( &connspec );
     let manager = ConnectionManager::<DbConnection>::new(connspec);
     r2d2::Pool::builder()
         .build(manager)
@@ -58,23 +47,5 @@ pub fn create_pool() -> Pool {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
 
-    fn with_db<F>(f: F) -> ()
-    where
-        F: Fn(&SqliteConnection) -> (),
-    {
-        let conn = establish_connection().unwrap();
-        conn.test_transaction::<_, diesel::result::Error, _>(|| {
-            f(&conn);
-            Ok(())
-        });
-    }
-
-    #[test]
-    fn database_connection() {
-        use crate::establish_connection;
-        let conn = establish_connection();
-        assert_eq!(conn.is_ok(), true);
-    }
 }

lootalot_db/src/models/item.rs

@@ -1,8 +1,64 @@
-use crate::*;
+use diesel::prelude::*;
+use diesel::dsl::{Eq, Filter, Select};
+use crate::schema::{looted, items};
 
+/// Represents a unique item in inventory
+///
+/// It is also used as a public representation of Loot, since owner
+/// information is implicit.
+/// Or maybe this is a little too confusing ??
 #[derive(Debug, Queryable, Serialize)]
 pub struct Item {
     id: i32,
     name: String,
-    base_value: i32,
+    base_price: i32,
+}
+
+type ItemColumns = ( looted::id, looted::name, looted::base_price, );
+type OwnedBy = Select<OwnedLoot, ItemColumns>;
+const ITEM_COLUMNS: ItemColumns = ( looted::id, looted::name, looted::base_price, );
+
+impl Item {
+    /// Insert this item inside the Looted table.
+    ///
+    /// This adds a copy of the item into the group chest,
+    /// to be claimed by players or sold.
+    /// Returns the id of the looted item (differs from the original id)
+    pub fn to_looted(self) -> Result<i32, ()>{
+        // Copy data inside a new Loot
+        // Set the owner id to 0 (group)
+        Err(())
+    }
+
+    /// Public proxy for Loot::owned_by that selects only Item fields
+    pub fn owned_by(player: i32) -> OwnedBy {
+        Loot::owned_by(player)
+            .select(ITEM_COLUMNS)
+    }
+}
+
+/// Represents an item that has been looted
+#[derive(Debug, Queryable, Serialize)]
+struct Loot {
+    id: i32,
+    name: String,
+    base_value: i32,
+    owner: i32,
+}
+
+type WithOwner = Eq<looted::owner_id, i32>;
+type OwnedLoot = Filter<looted::table, WithOwner>;
+
+impl Loot {
+    /// A filter on Loot that is owned by given player
+    fn owned_by(id: i32) -> OwnedLoot {
+        looted::table
+            .filter(looted::owner_id.eq(id))
+    }
+    /// Delete the item, returning the gained wealth
+    fn sell(_modifier: i8) -> Result<i32, ()> {
+        // Calculate sell value : base_value / 2 * modifier
+        // Delete recording of loot
+        Err(())
+    }
 }

lootalot_db/src/models/player.rs

@@ -1,6 +1,4 @@
 use crate::schema::players;
-use crate::serde_derive::Serialize;
-use crate::*;
 
 /// Representation of a player in database
 #[derive(Debug, Queryable, Serialize)]