Will_paginate 및 DataMapper가 irb에서만 작동

Question

나는 will_paginate를 Sinatra와 함께 사용하려고하며 will_paginate 및 DataMapper에 문제가 있습니다. 그래서 나는 코드가 있습니다

require 'data_mapper' 
require 'will_paginate' 
require 'will_paginate/data_mapper' 
class User 
    include DataMapper::Resource 

    property :id, Serial # primary serial key 
    property :username, String, length: 5..15, unique: true 
    property :fullname, String, length: 5..25 
    property :email, String, required: true, unique: true, format: :email_address 
    property :hashed_password, String 
    property :created_at, Time, required: true 
    property :auth_token, String 
    property :locale, String 

    has n, :items 
end 

class Item 
    include DataMapper::Resource 
    property :id, Serial 
    property :question, String, required: true 
    property :answer, String, required: true 
    property :ef, Float 
    property :interval, Float 
    property :created_at, Time 
    property :updated_at, Time 
    property :reviev_at, Time 

    belongs_to :user 
end 

DataMapper::setup(:default, "sqlite3://#{File.expand_path(File.dirname(__FILE__))}/database2.db") 
DataMapper.finalize 
DataMapper.auto_upgrade! 

u = User.first 
p = u.items.paginate(page: 1) 
puts p.total_entries 

을 그리고 실행이 문제가 발생합니다

/home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:942:in `assert_valid_order': +options[:order]+ should not be empty if +options[:fields] contains a non-operator (ArgumentError) 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:773:in `block in assert_valid_options' 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:766:in `each' 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:766:in `assert_valid_options' 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:363:in `update' 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/dm-core-1.1.0/lib/dm-core/query.rb:386:in `merge' 
    from /home/changs/src/PwS/vendor/bundle/ruby/1.9.1/gems/will_paginate-3.0.2/lib/will_paginate/data_mapper.rb:54:in `total_entries' 
    from test.rb:39:in `<main>' 

을하지만 마지막 세 줄을 주석 경우는 IRB뿐만 경작 작동합니다

ruby-1.9.2-p290 :001 > require './test' # file with deleted last 3 lines 
=> true 
ruby-1.9.2-p290 :002 > u = User.first 
=> #<User @id=1 @username="Testt" @fullname="tetestse" @email="test@wp.pl" @hashed_password=nil @created_at=2011-11-14 00:00:00 +0100 @auth_token=nil @locale=nil> 
ruby-1.9.2-p290 :003 > p = u.items.paginate(page: 1) 
=> [#<Item @id=1 @question="A" @answer="B" @ef=nil @interval=nil @created_at=2011-11-14 00:00:00 +0100 @updated_at=2011-11-14 00:00:00 +0100 @reviev_at=nil @user_id=1>, #<Item @id=2 @question="C" @answer="D" @ef=nil @interval=nil @created_at=2011-11-14 00:00:00 +0100 @updated_at=2011-11-14 00:00:00 +0100 @reviev_at=nil @user_id=1>] 
ruby-1.9.2-p290 :004 > puts p.total_entries 
2 
=> nil 

Answer 1

이를 스크립트에서 p.total_entries을 호출하면 p이로드되지 않기 때문에 발생합니다. irb 인쇄에서는 p을 설정 한 후 값이로드됩니다. 이 같은 total_entries를 호출하기 전에 다시로드하여 해결할 수 있습니다 : 나 여기에

u = User.first 
p = u.items.paginate(page: 1) 
p.reload 
puts p.total_entries 

보고해야 will_paginate 버그처럼 보인다.