scaffold messages

app/controllers/messages_controller.rb

@@ -0,0 +1,69 @@
+class MessagesController < ApplicationController
+  before_action :set_message, only: %i[ show edit update destroy ]
+
+  # GET /messages or /messages.json
+  def index
+    @messages = Message.all
+  end
+
+  # GET /messages/1 or /messages/1.json
+  def show
+  end
+
+  # GET /messages/new
+  def new
+    @message = Message.new
+  end
+
+  # GET /messages/1/edit
+  def edit
+  end
+
+  # POST /messages or /messages.json
+  def create
+    @message = Message.new(message_params)
+
+    respond_to do |format|
+      if @message.save
+        format.html { redirect_to @message, notice: "Message was successfully created." }
+        format.json { render :show, status: :created, location: @message }
+      else
+        format.html { render :new, status: :unprocessable_entity }
+        format.json { render json: @message.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /messages/1 or /messages/1.json
+  def update
+    respond_to do |format|
+      if @message.update(message_params)
+        format.html { redirect_to @message, notice: "Message was successfully updated." }
+        format.json { render :show, status: :ok, location: @message }
+      else
+        format.html { render :edit, status: :unprocessable_entity }
+        format.json { render json: @message.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /messages/1 or /messages/1.json
+  def destroy
+    @message.destroy
+    respond_to do |format|
+      format.html { redirect_to messages_url, notice: "Message was successfully destroyed." }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_message
+      @message = Message.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def message_params
+      params.require(:message).permit(:body)
+    end
+end

app/helpers/messages_helper.rb

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

app/models/message.rb

@@ -0,0 +1,3 @@
+class Message < ApplicationRecord
+  validates :body, presence: true
+end

app/views/messages/_form.html.erb

@@ -0,0 +1,22 @@
+<%= form_with(model: message) do |form| %>
+  <% if message.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(message.errors.count, "error") %> prohibited this message from being saved:</h2>
+
+      <ul>
+        <% message.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= form.label :body %>
+    <%= form.text_area :body %>
+  </div>
+
+  <div class="actions">
+    <%= form.submit %>
+  </div>
+<% end %>

app/views/messages/_message.html.erb

@@ -0,0 +1,10 @@
+<div id="<%= dom_id message %>" class="scaffold_record">
+  <p>
+    <strong>Body:</strong>
+    <%= message.body %>
+  </p>
+
+  <p>
+    <%= link_to "Show this message", message %>
+  </p>
+</div>

app/views/messages/_message.json.jbuilder

@@ -0,0 +1,2 @@
+json.extract! message, :id, :body, :created_at, :updated_at
+json.url message_url(message, format: :json)

app/views/messages/edit.html.erb

@@ -0,0 +1,10 @@
+<h1>Editing message</h1>
+
+<%= render "form", message: @message %>
+
+<br>
+
+<div>
+  <%= link_to "Show this message", @message %> |
+  <%= link_to "Back to messages", messages_path %>
+</div>

app/views/messages/index.html.erb

@@ -0,0 +1,9 @@
+<p id="notice"><%= notice %></p>
+
+<h1>Message</h1>
+
+<div id="messages">
+  <%= render @messages %>
+</div>
+
+<%= link_to "New message", new_message_path %>

app/views/messages/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @messages, partial: "messages/message", as: :message

app/views/messages/new.html.erb

@@ -0,0 +1,9 @@
+<h1>New message</h1>
+
+<%= render "form", message: @message %>
+
+<br>
+
+<div>
+  <%= link_to "Back to messages", messages_path %>
+</div>

app/views/messages/show.html.erb

@@ -0,0 +1,10 @@
+<p id="notice"><%= notice %></p>
+
+<%= render @message %>
+
+<div>
+  <%= link_to "Edit this message", edit_message_path(@message) %> |
+  <%= link_to "Back to messages", messages_path %>
+
+  <%= button_to "Destroy this message", message_path(@message), method: :delete %>
+</div>

app/views/messages/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "messages/message", message: @message

config/routes.rb

@@ -1,6 +1,4 @@
 Rails.application.routes.draw do
-  # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
-
-  # Almost every application defines a route for the root path ("/") at the top of this file.
-  # root "articles#index"
+  root "messages#index"
+  resources :messages
 end

db/migrate/20211111181451_create_messages.rb

@@ -0,0 +1,9 @@
+class CreateMessages < ActiveRecord::Migration[7.0]
+  def change
+    create_table :messages do |t|
+      t.text :body
+
+      t.timestamps
+    end
+  end
+end

test/controllers/messages_controller_test.rb

@@ -0,0 +1,48 @@
+require "test_helper"
+
+class MessagesControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @message = messages(:one)
+  end
+
+  test "should get index" do
+    get messages_url
+    assert_response :success
+  end
+
+  test "should get new" do
+    get new_message_url
+    assert_response :success
+  end
+
+  test "should create message" do
+    assert_difference("Message.count") do
+      post messages_url, params: { message: { body: @message.body } }
+    end
+
+    assert_redirected_to message_url(Message.last)
+  end
+
+  test "should show message" do
+    get message_url(@message)
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get edit_message_url(@message)
+    assert_response :success
+  end
+
+  test "should update message" do
+    patch message_url(@message), params: { message: { body: @message.body } }
+    assert_redirected_to message_url(@message)
+  end
+
+  test "should destroy message" do
+    assert_difference("Message.count", -1) do
+      delete message_url(@message)
+    end
+
+    assert_redirected_to messages_url
+  end
+end

test/fixtures/messages.yml

@@ -0,0 +1,7 @@
+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  body: MyText
+
+two:
+  body: MyText

test/models/message_test.rb

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

test/system/messages_test.rb

@@ -0,0 +1,43 @@
+require "application_system_test_case"
+
+class MessagesTest < ApplicationSystemTestCase
+  setup do
+    @message = messages(:one)
+  end
+
+  test "visiting the index" do
+    visit messages_url
+    assert_selector "h1", text: "Messages"
+  end
+
+  test "should create Message" do
+    visit messages_url
+    click_on "New Message"
+
+    fill_in "Body", with: @message.body
+    click_on "Create Message"
+
+    assert_text "Message was successfully created"
+    click_on "Back"
+  end
+
+  test "should update Message" do
+    visit messages_url
+    click_on "Edit", match: :first
+
+    fill_in "Body", with: @message.body
+    click_on "Update Message"
+
+    assert_text "Message was successfully updated"
+    click_on "Back"
+  end
+
+  test "should destroy Message" do
+    visit messages_url
+    page.accept_confirm do
+      click_on "Destroy", match: :first
+    end
+
+    assert_text "Message was successfully destroyed"
+  end
+end