first commit

app/controllers/todos_controller.rb

@@ -0,0 +1,41 @@
+class TodosController < ApplicationController
+  before_action :set_todo, only: %i[show update destroy]
+
+  def index
+    render json: Todo.order(created_at: :desc)
+  end
+
+  def show
+    render json: @todo
+  end
+
+  def create
+    todo = Todo.new(todo_params)
+    todo.save!
+    render json: todo, status: :created
+  rescue ActiveRecord::RecordInvalid => error
+    render json: { errors: error.record.errors }, status: :unprocessable_entity
+  end
+
+  def update
+    @todo.update!(todo_params)
+    render json: @todo
+  rescue ActiveRecord::RecordInvalid => error
+    render json: { errors: error.record.errors }, status: :unprocessable_entity
+  end
+
+  def destroy
+    @todo.destroy!
+    head :no_content
+  end
+
+  private
+
+  def set_todo
+    @todo = Todo.find(params[:id])
+  end
+
+  def todo_params
+    params.expect(todo: %i[title completed])
+  end
+end