Uses new IngredientListManager :)

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> {