moves db logic inside model's managers

lootalot_db/src/models/player.rs

@@ -1,3 +1,5 @@
+use diesel::prelude::*;
+use crate::{DbConnection, QueryResult};
 use crate::schema::players;
 
 /// Representation of a player in database
@@ -20,6 +22,32 @@ pub struct Player {
     pub pp: i32,
 }
 
+pub struct AsPlayer<'q>(pub &'q DbConnection, pub i32);
+
+impl<'q> AsPlayer<'q> {
+    pub fn update_wealth(&self, value_in_gp: f32) -> QueryResult<Wealth> {
+        use crate::schema::players::dsl::*;
+        let current_wealth = players
+            .find(self.1)
+            .select((cp, sp, gp, pp))
+            .first::<Wealth>(self.0)?;
+        let updated_wealth = Wealth::from_gp(current_wealth.to_gp() + value_in_gp);
+        // Difference in coins that is sent back
+        let difference = Wealth {
+            cp: updated_wealth.cp - current_wealth.cp,
+            sp: updated_wealth.sp - current_wealth.sp,
+            gp: updated_wealth.gp - current_wealth.gp,
+            pp: updated_wealth.pp - current_wealth.pp,
+        };
+        diesel::update(players)
+            .filter(id.eq(self.1))
+            .set(&updated_wealth)
+            .execute(self.0)?;
+        Ok(difference)
+    }
+}
+
+
 /// Unpack a floating value of gold pieces to integer
 /// values of copper, silver, gold and platinum pieces
 ///