created the service layer

Author: zesameri

charles/secrets/services/todo.service.js

@@ -0,0 +1,83 @@
+// Getting the Mongoose Model
+var ToDo = require('../models/todo.model')
+
+// Saving the context of this module inside the _the variable
+_this = this
+
+// Async function to get the To do List
+exports.getTodos = async function(query, page, limit)
+{
+    var options = {
+        page,
+        limit
+    }
+    // awaited promise, return todo list from the promise
+    try {
+        var todos = await ToDo.paginate(query, options)
+        return todos;
+
+    } catch(e) {
+        throw Error('Error while Paginating Todos')
+    }
+}
+
+// Creating a new Mongoose Object
+exports.createTodo = async function(todo)
+{
+    var newTodo = new ToDo( {
+        title: todo.title,
+        description: todo.description,
+        date: new Date(),
+        status: todo.status
+    })
+    // save and return the new todo
+    try {
+        var savedTodo = await newTodo.save()
+        return savedTodo;
+    } catch(e) {
+        throw Error("Error while creating Todo")
+    }
+}
+
+exports.updateTodo = async function(todo){
+    var id = todo.id
+    // Find the old Todo Object by the Id
+    try {
+        var oldTodo = await ToDo.findById(id);
+    } catch(e) {
+        throw Error("Error occured while finding the Todo")
+    }
+    // if no Todo exists return false
+    if(!oldTodo){
+        return false;
+    }
+
+    console.log(oldTodo)
+
+    //Edit the Todo Object
+    oldTodo.title = todo.title
+    oldTodo.description = todo.description
+    oldTodo.status = todo.status
+
+    console.log(oldTodo)
+
+    try {
+        var savedTodo = await oldTodo.save()
+        return savedTodo;
+    } catch(e) {
+        throw Error("Error occured while updating the Todo");
+    }
+}
+
+// Delete the Todo
+exports.deleteTodo = async function(id){
+    try {
+        var deleted = await ToDo.remove({_id: id})
+        if(deleted.result.n === 0){
+            throw Error("Todo Could not be deleted")
+        }
+        return deleted
+    } catch(e) {
+        throw Error("Error Occured while Deleting the Todo")
+    }
+}