Uses new IngredientListManager :)

cookbook/src/bin/show_recipes.rs

@@ -1,35 +1,18 @@
 extern crate cookbook;
 extern crate diesel;
 
-use self::cookbook::*;
-
-use diesel::sqlite::SqliteConnection;
 use cookbook::{
-    ingredients::IngredientList,
-    recipes::Recipe,
+    establish_connection,
+    recipes::{self, Recipe},
 };
 
-struct IngredientListManager<'a>(&'a SqliteConnection, IngredientList);
-
-impl<'a> IngredientListManager<'a> {
-    fn display_lines(&self) -> String {
-        let mut repr = String::new();
-        for id in self.1.iter() {
-            let ingdt = ingredients::get(self.0, id).expect("Database integrity error");
-            repr.push_str(&format!("{}\n", ingdt.alias));
-        }
-        repr
-    }
-}
-
 fn main() {
-
     let conn = establish_connection();
     let result = recipes::load_all(&conn);
     println!("Here are {} recipes [{}]:", result.len(), result.len() * std::mem::size_of::<Recipe>());
     for rec in result {
         println!("*************\n{}\n({:?})", rec.title, rec.category);
         println!("-------------\n");
-        println!("{}", IngredientListManager(&conn, rec.ingredients).display_lines());
+        println!("{}", rec.ingredients.into_manager(&conn).display_lines());
     }
 }

cookbook/src/lib.rs

@@ -49,6 +49,26 @@ pub mod ingredients {
     use super::{SqliteConnection, schema};
     use super::diesel::prelude::*;
 
+    pub struct IngredientListManager<'a>(&'a SqliteConnection, IngredientList);
+
+    impl<'a> IngredientListManager<'a> {
+        pub fn display_lines(&self) -> String {
+            use self::get;
+            let mut repr = String::new();
+            for id in self.1.iter() {
+                let ingdt = get(self.0, id).expect("Database integrity error");
+                repr.push_str(&format!("{}\n", ingdt.alias));
+            }
+            repr
+        }
+    }
+
+    impl<'a> IngredientList {
+        pub fn into_manager(self, conn: &'a SqliteConnection) -> IngredientListManager<'a> {
+            IngredientListManager(conn, self)
+        }
+    }
+
     /// Returns the id of the ingredient identifiable by `name: &str`
     /// If the ingredient does not yet exists, it is inserted in database.
     pub fn get_id_or_create(conn: &SqliteConnection, name: &str) -> Result<i32,String> {