in app/controllers/microposts_controller.rb [4:15]
def create
@micropost = current_user.microposts.build(micropost_params)
@micropost.image.attach(params[:micropost][:image])
if @micropost.save
flash[:success] = "Micropost created!"
redirect_to root_url
else
@feed_items = current_user.feed.paginate(page: params[:page])
render 'static_pages/home', status: :unprocessable_entity
end
end