Guard clauses!

guard_clauses.md

What happens if the update or create fails? We need to ensure that our user is notified in case of failure:

Anti-pattern

post '/posts' do
  @post = Post.new(params[:post)
  @post.save
  redirect "/posts"
end

Anti-Anti-Pattern:

post '/posts' do
  @post = current_user.posts.build(params[:post)
  if @post.save
    redirect "/posts"
  else
    render :new, locals: { messages: [ "There was an error!", @post.errors.full_messages ] }
  end
end