Add reminder feature

app/controllers/application_controller.rb

@@ -1,2 +1,3 @@
 class ApplicationController < ActionController::Base
+  before_action :authenticate_user!
 end

app/controllers/reminders_controller.rb

@@ -0,0 +1,51 @@
+class RemindersController < ApplicationController
+  before_action :set_reminder, only: %i[show edit update destroy]
+
+  def index
+    @reminders = Reminder.all
+  end
+
+  def show; end
+
+  def new
+    @reminder = Reminder.new
+  end
+
+  def edit; end
+
+  def create
+    @reminder = Reminder.new(reminder_params)
+    @reminder.user_id = current_user.id
+
+    if @reminder.save
+      redirect_to @reminder, notice: 'Reminder was successfully created.'
+    else
+      render :new
+    end
+  end
+
+  def update
+    if @reminder.update(reminder_params)
+      redirect_to @reminder, notice: 'Reminder was successfully updated.'
+    else
+      render :edit
+    end
+  end
+
+  def destroy
+    @reminder.destroy
+    redirect_to reminders_url, notice: 'Reminder was successfully destroyed.'
+  end
+
+  private
+
+  # Use callbacks to share common setup or constraints between actions.
+  def set_reminder
+    @reminder = Reminder.find(params[:id])
+  end
+
+  # Only allow a list of trusted parameters through.
+  def reminder_params
+    params.require(:reminder).permit(:title, :body, :date, :user_id)
+  end
+end