initial commit

exercises/06_ticket_management/14_index_mut/Cargo.toml

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+[package]
+name = "index_mut"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ticket_fields = { path = "../../../helpers/ticket_fields" }

exercises/06_ticket_management/14_index_mut/src/lib.rs

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+// TODO: Implement `IndexMut<&TicketId>` and `IndexMut<TicketId>` for `TicketStore`.
+
+use std::ops::Index;
+use ticket_fields::{TicketDescription, TicketTitle};
+
+#[derive(Clone)]
+pub struct TicketStore {
+    tickets: Vec<Ticket>,
+    counter: u64,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct TicketId(u64);
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Ticket {
+    pub id: TicketId,
+    pub title: TicketTitle,
+    pub description: TicketDescription,
+    pub status: Status,
+}
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct TicketDraft {
+    pub title: TicketTitle,
+    pub description: TicketDescription,
+}
+
+#[derive(Clone, Debug, Copy, PartialEq)]
+pub enum Status {
+    ToDo,
+    InProgress,
+    Done,
+}
+
+impl TicketStore {
+    pub fn new() -> Self {
+        Self {
+            tickets: Vec::new(),
+            counter: 0,
+        }
+    }
+
+    pub fn add_ticket(&mut self, ticket: TicketDraft) -> TicketId {
+        let id = TicketId(self.counter);
+        self.counter += 1;
+        let ticket = Ticket {
+            id,
+            title: ticket.title,
+            description: ticket.description,
+            status: Status::ToDo,
+        };
+        self.tickets.push(ticket);
+        id
+    }
+
+    pub fn get(&self, id: TicketId) -> Option<&Ticket> {
+        self.tickets.iter().find(|&t| t.id == id)
+    }
+}
+
+impl Index<TicketId> for TicketStore {
+    type Output = Ticket;
+
+    fn index(&self, index: TicketId) -> &Self::Output {
+        self.get(index).unwrap()
+    }
+}
+
+impl Index<&TicketId> for TicketStore {
+    type Output = Ticket;
+
+    fn index(&self, index: &TicketId) -> &Self::Output {
+        &self[*index]
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{Status, TicketDraft, TicketStore};
+    use ticket_fields::test_helpers::{ticket_description, ticket_title};
+
+    #[test]
+    fn works() {
+        let mut store = TicketStore::new();
+
+        let draft = TicketDraft {
+            title: ticket_title(),
+            description: ticket_description(),
+        };
+        let id = store.add_ticket(draft.clone());
+        let ticket = &store[id];
+        assert_eq!(draft.title, ticket.title);
+        assert_eq!(draft.description, ticket.description);
+        assert_eq!(ticket.status, Status::ToDo);
+
+        let ticket = &mut store[id];
+        ticket.status = Status::InProgress;
+
+        let ticket = &store[id];
+        assert_eq!(ticket.status, Status::InProgress);
+
+        let ticket = &mut store[&id];
+        ticket.status = Status::Done;
+
+        let ticket = &store[id];
+        assert_eq!(ticket.status, Status::Done);
+    }
+}