Sinatra, Datamapper, PostgreSQL, ruby 1.9.3p194. Horrid Error "NoMethodError at /undefined method `each' for "MyNameHere":String"

login.erb

<form action="/" method="post">
  <p>
    <label>Name</label>
    <input type="text/plain" name="name" >
  </p>

  <p>
    <input type="submit">
  </p>

main.rb

# This works just fine when getting name from contact form.

post "/" do
  params[:name]
  @u = User.new({:name => params[:name]}) 
  @u.save
  if @u.save
    redirect "/success"
  else
    redirect "/"
  end
end

main2.rb

# This does not. In Ruby 1.9.x strings are no longer enumerable and 'string.each' is
# undefined and returns this error even when I don't use '.each' directly.
# NoMethodError at /undefined method `each' for "MyNameHere":String

post "/" do
  @u = User.new(params[:name]) 
  @u.save
  if @u.save
    redirect "/success"
  else
    redirect "/"
  end
end