Scaffold Todo

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

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+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

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+<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

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

app/views/todos/new.html.erb

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+<% 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

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+<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