hashset vs item

src/db.rs

@@ -1,13 +1,12 @@
 use std::collections::HashSet;
-use std::hash::{Hash};
+use std::hash::{Hash, Hasher};
 
 use std::fs;
 use std::io::{self, Write, BufRead};
 use std::fmt;
+use std::cmp::PartialEq;
 
 
-// TODO: use this structure in HashSet of items
-#[derive(PartialEq, Eq, Hash)]
 pub struct Item {
     pub id: String,
     pub content: String
@@ -20,6 +19,20 @@ impl Item {
     }
 }
 
+impl PartialEq for Item {
+    fn eq(&self, other: &Self) -> bool {
+        self.id == other.id 
+    }
+}
+
+impl Eq for Item {}
+
+impl Hash for Item {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.id.hash(state);
+    }
+}
+
 impl fmt::Display for Item {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         writeln!(f, "{}", self.id)?;