Scaffold Todo

.gitignore

@@ -33,3 +33,4 @@
 # Ignore key files for decrypting credentials and more.
 /config/*.key
 
+.idea/

app/controllers/todos_controller.rb

@@ -0,0 +1,70 @@
+class TodosController < ApplicationController
+  before_action :set_todo, only: %i[ show edit update destroy ]
+
+  # GET /todos or /todos.json
+  def index
+    @todos = Todo.all
+  end
+
+  # GET /todos/1 or /todos/1.json
+  def show
+  end
+
+  # GET /todos/new
+  def new
+    @todo = Todo.new
+  end
+
+  # GET /todos/1/edit
+  def edit
+  end
+
+  # POST /todos or /todos.json
+  def create
+    @todo = Todo.new(todo_params)
+
+    respond_to do |format|
+      if @todo.save
+        format.html { redirect_to @todo, notice: "Todo was successfully created." }
+        format.json { render :show, status: :created, location: @todo }
+      else
+        format.html { render :new, status: :unprocessable_entity }
+        format.json { render json: @todo.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /todos/1 or /todos/1.json
+  def update
+    respond_to do |format|
+      if @todo.update(todo_params)
+        format.html { redirect_to @todo, notice: "Todo was successfully updated.", status: :see_other }
+        format.json { render :show, status: :ok, location: @todo }
+      else
+        format.html { render :edit, status: :unprocessable_entity }
+        format.json { render json: @todo.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /todos/1 or /todos/1.json
+  def destroy
+    @todo.destroy!
+
+    respond_to do |format|
+      format.html { redirect_to todos_path, notice: "Todo was successfully destroyed.", status: :see_other }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_todo
+      @todo = Todo.find(params.expect(:id))
+    end
+
+    # Only allow a list of trusted parameters through.
+    def todo_params
+      params.expect(todo: [ :name, :description ])
+    end
+end

app/helpers/todos_helper.rb

@@ -0,0 +1,2 @@
+module TodosHelper
+end

app/models/todo.rb

@@ -0,0 +1,2 @@
+class Todo < ApplicationRecord
+end

app/views/todos/_form.html.erb

@@ -0,0 +1,27 @@
+<%= form_with(model: todo) do |form| %>
+  <% if todo.errors.any? %>
+    <div style="color: red">
+      <h2><%= pluralize(todo.errors.count, "error") %> prohibited this todo from being saved:</h2>
+
+      <ul>
+        <% todo.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div>
+    <%= form.label :name, style: "display: block" %>
+    <%= form.text_field :name %>
+  </div>
+
+  <div>
+    <%= form.label :description, style: "display: block" %>
+    <%= form.textarea :description %>
+  </div>
+
+  <div>
+    <%= form.submit %>
+  </div>
+<% end %>

app/views/todos/_todo.html.erb

@@ -0,0 +1,12 @@
+<div id="<%= dom_id todo %>">
+  <div>
+    <strong>Name:</strong>
+    <%= todo.name %>
+  </div>
+
+  <div>
+    <strong>Description:</strong>
+    <%= todo.description %>
+  </div>
+
+</div>

app/views/todos/_todo.json.jbuilder

@@ -0,0 +1,2 @@
+json.extract! todo, :id, :name, :description, :created_at, :updated_at
+json.url todo_url(todo, format: :json)

app/views/todos/edit.html.erb

@@ -0,0 +1,12 @@
+<% content_for :title, "Editing todo" %>
+
+<h1>Editing todo</h1>
+
+<%= render "form", todo: @todo %>
+
+<br>
+
+<div>
+  <%= link_to "Show this todo", @todo %> |
+  <%= link_to "Back to todos", todos_path %>
+</div>

app/views/todos/index.html.erb

@@ -0,0 +1,16 @@
+<p style="color: green"><%= notice %></p>
+
+<% content_for :title, "Todos" %>
+
+<h1>Todos</h1>
+
+<div id="todos">
+  <% @todos.each do |todo| %>
+    <%= render todo %>
+    <p>
+      <%= link_to "Show this todo", todo %>
+    </p>
+  <% end %>
+</div>
+
+<%= link_to "New todo", new_todo_path %>

app/views/todos/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @todos, partial: "todos/todo", as: :todo

app/views/todos/new.html.erb

@@ -0,0 +1,11 @@
+<% content_for :title, "New todo" %>
+
+<h1>New todo</h1>
+
+<%= render "form", todo: @todo %>
+
+<br>
+
+<div>
+  <%= link_to "Back to todos", todos_path %>
+</div>

app/views/todos/show.html.erb

@@ -0,0 +1,10 @@
+<p style="color: green"><%= notice %></p>
+
+<%= render @todo %>
+
+<div>
+  <%= link_to "Edit this todo", edit_todo_path(@todo) %> |
+  <%= link_to "Back to todos", todos_path %>
+
+  <%= button_to "Destroy this todo", @todo, method: :delete %>
+</div>

app/views/todos/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "todos/todo", todo: @todo

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  resources :todos
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.

db/migrate/20251027091014_create_todos.rb

@@ -0,0 +1,10 @@
+class CreateTodos < ActiveRecord::Migration[8.1]
+  def change
+    create_table :todos do |t|
+      t.string :name
+      t.text :description
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -0,0 +1,20 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `bin/rails
+# db:schema:load`. When creating a new database, `bin/rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema[8.1].define(version: 2025_10_27_091014) do
+  create_table "todos", force: :cascade do |t|
+    t.datetime "created_at", null: false
+    t.text "description"
+    t.string "name"
+    t.datetime "updated_at", null: false
+  end
+end

test/controllers/todos_controller_test.rb

@@ -0,0 +1,48 @@
+require "test_helper"
+
+class TodosControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @todo = todos(:one)
+  end
+
+  test "should get index" do
+    get todos_url
+    assert_response :success
+  end
+
+  test "should get new" do
+    get new_todo_url
+    assert_response :success
+  end
+
+  test "should create todo" do
+    assert_difference("Todo.count") do
+      post todos_url, params: { todo: { description: @todo.description, name: @todo.name } }
+    end
+
+    assert_redirected_to todo_url(Todo.last)
+  end
+
+  test "should show todo" do
+    get todo_url(@todo)
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get edit_todo_url(@todo)
+    assert_response :success
+  end
+
+  test "should update todo" do
+    patch todo_url(@todo), params: { todo: { description: @todo.description, name: @todo.name } }
+    assert_redirected_to todo_url(@todo)
+  end
+
+  test "should destroy todo" do
+    assert_difference("Todo.count", -1) do
+      delete todo_url(@todo)
+    end
+
+    assert_redirected_to todos_url
+  end
+end

test/fixtures/todos.yml

@@ -0,0 +1,9 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  name: MyString
+  description: MyText
+
+two:
+  name: MyString
+  description: MyText

test/models/todo_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class TodoTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end