小编use*_*228的帖子

require 'sinatra/base'

class Foo < Sinatra::Base
  get('/foo') { 'foo' }
end

class Bar < Sinatra::Base
  get('/bar') { 'bar' }
end

run Rack::Cascade, [Foo, Bar]

我猜不出这段代码有什么问题.当我运行:ruby server.rb时,它会抛出一个错误

class User

    include DataMapper::Resource

    property :id,              Serial
    property :name,            String
    property :email,           String

    has n, :records

end


class Project
    include DataMapper::Resource

    property :id,          Serial
    property :name,        String

    has n, :records ?????

end
#
class Record

   # SPEND_REGEX = /^[0-9]{1}:[0-5]{1}[0-9]{1}$/

    include DataMapper::Resource


    property :id,                Serial
    property :reporting_type,    String
    property :spend_time,        String

    belongs_to :user
    belongs_to :project ????


end

  DataMapper.auto_upgrade!

用??? 我标记了抛出错误的关系"`execute_non_query':无法添加带有默认值NULL的NOT NULL列(DataObjects :: SyntaxError)"如何定义2与datamapper中的一个模型有很多关系？

这是一本书的例子,有点修改过.似乎会话不起作用.每次我开新会议.

#reporter.rb  

     require 'sinatra/base'

    class LoginScreen < Sinatra::Base

      #configure(:development) { set :session_secret, "something" }

      enable :sessions

      get('/login') { erb :login }

      post('/login') do
        if params[:user][:login] == 'admin' && params[:user][:password] == 'admin'
          session['user_name'] = params[:user][:login]
          redirect '/'
        else
          session[:notice] = "notice!"
          redirect '/login'
        end
      end
    end

    class Reporter < Sinatra::Base
      # "?????????" ????? ???????? ????? ?????????
      # enable :sessions
      # use Rack::Session::Pool, :expire_after => 2592000
      #configure(:development) { set :session_secret, "something" }
      use LoginScreen

      before do
        unless session[:user_name]
          halt "Access denied, please …