Add email notifications for events registrations, add switch-checkboxes, create EventsRegistrations controller, separate page for events that require registration

app/controllers/admin/events_registrations_controller.rb

@@ -0,0 +1,72 @@
+module Admin
+  class EventsRegistrationsController < Admin::BaseController
+    load_resource :conference, find_by: :short_title
+    load_resource :program, through: :conference, singleton: true
+    load_resource :event
+    load_resource :registration, through: :conference
+    before_action :load_events_registration
+    authorize_resource only: :toggle_attendance
+    after_action :prepare_unobtrusive_flash, only: [:toggle, :toggle_attendance]
+
+    def show
+      authorize! :update, @event
+    end
+
+    def toggle_attendance
+      @events_registration = EventsRegistration.find_by(event_id: @event.id, registration_id: @registration.id)
+      @events_registration.attended = !@events_registration.attended
+
+      if @events_registration.attended
+        if @events_registration.save
+          flash[:notice] = "You have marked #{@registration.email} as attended."
+        else
+          flash[:error] = "Failed to mark #{@registration.email} as attended."
+        end
+      elsif @events_registration.save
+        flash[:notice] = "You have marked #{@registration.email} as NOT attended."
+      else
+        flash[:error] = "Failed to mark #{@registration.email} as NOT attended."
+      end
+
+      respond_to do |format|
+        format.js
+      end
+    end
+
+    def toggle
+      authorize! :toggle, @events_registration
+
+      if params[:state] == 'false'
+        # Destroy the registration to the event
+        if @events_registration.destroy
+          flash[:notice] = "You successfully unregistered #{@registration.email} from '#{@event.title}'"
+        else
+          flash[:error] = "Failed to unregister #{@registration.email} from '#{@event.title}'. Please try again."
+        end
+      elsif params[:state] == 'true'
+        # Create the registration to the event
+        if @events_registration.save
+          flash[:notice] = "You successfully registered #{@registration.email} to '#{@event.title}'"
+        else
+          flash[:error] = "Failed to register #{@registration.email} to '#{@event.title}'. Please try again."
+        end
+      else
+        flash[:error] = 'Something went wrong. Please take action again.'
+      end
+
+      respond_to do |format|
+        format.js
+      end
+    end
+
+    private
+
+    def events_registrations_params
+      params.require(:events_registrations).permit(:event_id, :registration_id)
+    end
+
+    def load_events_registration
+      @events_registration = EventsRegistration.find_or_initialize_by(event: @event, registration: @registration)
+    end
+  end
+end