feat: create a model for subtasks

src/query/mod.rs

@@ -2,15 +2,18 @@ use crate::errors::error::Error;
 use crate::errors::error_vec::ErrorVec;
 use crate::models::category::Category;
 use crate::models::project::Project;
+use crate::models::subtask::Subtask;
 use crate::models::task::Task;
 
 pub(crate) mod tasks;
 pub(crate) mod projects;
+pub(crate) mod subtasks;
 
 #[derive(PartialEq, Debug)]
 pub(crate) enum QueryValue {
-    Tasks(Vec<Task>),
     Projects(Vec<Project>),
+    Tasks(Vec<Task>),
+    Subtasks(Vec<Subtask>),
 }
 
 #[derive(Debug)]
@@ -20,7 +23,8 @@ pub(crate) enum QueryErrors {
 
 #[derive(PartialEq, Eq, Hash, Clone, Debug)]
 pub(crate) enum QueryKey {
+    Projects,
     Tasks,
     TasksInCategory(Category),
-    Projects,
+    SubtasksOfTaskId(i32),
 }