Having difficulty accessing validation errors in Sinatra

Question

I have a very basic form, with some very basic validations (though I need to create a custom validation later... you\'ll probably see a question on that tomorrow. =P ), but

Answer 1

What happens in your case is that the redirect will clear the errors again internally. You need to store them temporarily to have them available after the redirect. From Sinatra documentation on how to pass data on through redirects:

Or use a session:

  enable :session

  get '/foo' do
    session[:secret] = 'foo'
    redirect to('/bar')
  end

  get '/bar' do
    session[:secret]
  end

So in your case this would be

get '/' do
    @title = "Enter to win a rad Timbuk2 bag!"
    @errors = session[:errors]
    erb :welcome
end

and

if @entry.save
    redirect("/thanks")
else
    session[:errors] = @entry.errors.values.map{|e| e.to_s}
    redirect('/')
end

for your Sinatra file.

Your erb file would become

<% if @errors %>

    <% @errors.each do |e| %>
       
<%= e %>
    <% end %>

<% end %>