feat: create a task model

src/models/task.rs

@@ -0,0 +1,60 @@
+use diesel::prelude::*;
+use serde::{Deserialize, Serialize};
+use validator::Validate;
+use crate::models::category::Category;
+use crate::schema::tasks;
+
+const TITLE_LENGTH_MIN: u64 = 1;
+const TITLE_LENGTH_MAX: u64 = 255;
+
+#[derive(Queryable, Selectable, Serialize, Deserialize, Clone, Debug)]
+#[diesel(table_name = crate::schema::tasks)]
+#[diesel(check_for_backend(diesel::pg::Pg))]
+pub struct Task {
+    id: i32,
+    title: String,
+    deadline: Option<chrono::NaiveDate>,
+    category: Category,
+    project_id: Option<i32>,
+}
+
+impl Task {
+    pub fn id(&self) -> i32 {
+        self.id
+    }
+
+    pub fn title(&self) -> &str {
+        &self.title
+    }
+
+    pub fn deadline(&self) -> Option<chrono::NaiveDate> {
+        self.deadline
+    }
+
+    pub fn category(&self) -> &Category {
+        &self.category
+    }
+
+    pub fn project_id(&self) -> Option<i32> {
+        self.project_id
+    }
+}
+
+#[derive(Insertable, Serialize, Deserialize, Validate, Clone, Debug)]
+#[diesel(table_name = tasks)]
+pub struct NewTask {
+    #[validate(length(min = "TITLE_LENGTH_MIN", max = "TITLE_LENGTH_MAX", code = "title_length"))]
+    pub title: String,
+    pub deadline: Option<chrono::NaiveDate>,
+    pub category: Category,
+    pub project_id: Option<i32>,
+}
+
+impl NewTask {
+    pub fn new(
+        title: String, deadline: Option<chrono::NaiveDate>,
+        category: Category, project_id: Option<i32>,
+    ) -> Self {
+        Self { title, deadline, category, project_id }
+    }
+}