feat: create a model for subtasks

src/models/mod.rs

@@ -1,3 +1,4 @@
 pub(crate) mod project;
 pub(crate) mod category;
 pub(crate) mod task;
+pub(crate) mod subtask;

src/models/subtask.rs

@@ -0,0 +1,67 @@
+use chrono::NaiveDateTime;
+use crate::schema::subtasks;
+use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
+use validator::Validate;
+
+const TITLE_LENGTH_MIN: u64 = 1;
+const TITLE_LENGTH_MAX: u64 = 255;
+
+#[derive(Queryable, Selectable, Serialize, Deserialize, PartialEq, Clone, Debug)]
+#[diesel(table_name = subtasks)]
+#[diesel(check_for_backend(diesel::pg::Pg))]
+pub struct Subtask {
+    id: i32,
+    task_id: i32,
+    title: String,
+    is_completed: bool,
+    created_at: NaiveDateTime,
+    updated_at: NaiveDateTime,
+}
+
+impl Subtask {
+    pub fn id(&self) -> i32 {
+        self.id
+    }
+
+    pub fn task_id(&self) -> i32 {
+        self.task_id
+    }
+
+    pub fn title(&self) -> &str {
+        &self.title
+    }
+
+    pub fn is_completed(&self) -> bool {
+        self.is_completed
+    }
+
+    pub fn created_at(&self) -> NaiveDateTime {
+        self.created_at
+    }
+
+    pub fn updated_at(&self) -> NaiveDateTime {
+        self.updated_at
+    }
+}
+
+#[derive(Insertable, Serialize, Deserialize, Validate, Clone, Debug)]
+#[diesel(table_name = subtasks)]
+pub struct NewSubtask {
+    pub task_id: i32,
+    #[validate(length(min = "TITLE_LENGTH_MIN", max = "TITLE_LENGTH_MAX", code = "title_length"))]
+    pub title: String,
+    pub is_completed: bool,
+}
+
+impl NewSubtask {
+    pub fn new(task_id: i32, title: String, is_completed: bool) -> Self {
+        Self { task_id, title, is_completed }
+    }
+}
+
+impl From<Subtask> for NewSubtask {
+    fn from(subtask: Subtask) -> Self {
+        Self::new(subtask.task_id, subtask.title, subtask.is_completed)
+    }
+}