./bin/rails importmap:install

app/controllers/articles_controller.rb

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

app/controllers/welcome_controller.rb

@@ -0,0 +1,4 @@
+class WelcomeController < ApplicationController
+  def index
+  end
+end