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• Using a ControlParameter in FilterParameters when the property is null

  - by end-user

  I have a DataList and FormView; they have separate datasources, though they pull the same info. The FormView's datasource has a FilterExpression to pull whatever's been selected on the DataList. On first load, the SelectedValue of the DataList is null (naturally). I expect the FilterExpression to result in zero rows, but it doesn't. If I set the DefaultValue to 0, it does, but then the parameter never updates when I select something from the DataList. Am I doing it wrong?

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• Apache/2.2.20 (Ubuntu 11.10) gzip compression won't work on php pages, content is chunked

  - by FamousInteractive

  I'm running into a problem with a new production server whereto I'm transferring projects. The HTML output of the PHP applications isn't compressed by the Apache mod_deflate module. Other resources, as stylesheet and javascript files, even html pages, which are served with the same Content-type (text/html) as the PHP output, are compressed! The projects use the following rules (from HTML5 boilerplate) in the .htaccess: <IfModule mod_deflate.c> # Force deflate for mangled headers developer.yahoo.com/blogs/ydn/posts/2010/12/pushing-beyond-gzipping/ <IfModule mod_setenvif.c> <IfModule mod_headers.c> SetEnvIfNoCase ^(Accept-EncodXng|X-cept-Encoding|X{15}|~{15}|-{15})$ ^((gzip|deflate)\s*,?\s*)+|[X~-]{4,13}$ HAVE_Accept-Encoding RequestHeader append Accept-Encoding "gzip,deflate" env=HAVE_Accept-Encoding </IfModule> </IfModule> # HTML, TXT, CSS, JavaScript, JSON, XML, HTC: <IfModule filter_module> FilterDeclare COMPRESS FilterProvider COMPRESS DEFLATE resp=Content-Type $text/html FilterProvider COMPRESS DEFLATE resp=Content-Type $text/css FilterProvider COMPRESS DEFLATE resp=Content-Type $text/plain FilterProvider COMPRESS DEFLATE resp=Content-Type $text/xml FilterProvider COMPRESS DEFLATE resp=Content-Type $text/x-component FilterProvider COMPRESS DEFLATE resp=Content-Type $application/javascript FilterProvider COMPRESS DEFLATE resp=Content-Type $application/json FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/xhtml+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/rss+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/atom+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $application/vnd.ms-fontobject FilterProvider COMPRESS DEFLATE resp=Content-Type $image/svg+xml FilterProvider COMPRESS DEFLATE resp=Content-Type $image/x-icon FilterProvider COMPRESS DEFLATE resp=Content-Type $application/x-font-ttf FilterProvider COMPRESS DEFLATE resp=Content-Type $font/opentype FilterChain COMPRESS FilterProtocol COMPRESS DEFLATE change=yes;byteranges=no </IfModule> </IfModule> We have a testing machine that runs the same Apache, OS and PHP version. On that machine the compression works just fine on the PHP output. I've checked and compared Apache and PHP config files, all the same as far as I can tell. I've tried several manners of outputting the content of the PHP, using output buffering or just plain echoing the content. Same thing, no compression. Example response headers of a PHP output: HTTP/1.1 200 OK Date: Wed, 25 Apr 2012 23:30:59 GMT Server: Apache Accept-Ranges: bytes Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: public Pragma: no-cache Vary: User-Agent Keep-Alive: timeout=5, max=98 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html; charset=utf-8 Example of response headers on a css file: HTTP/1.1 200 OK Date: Wed, 25 Apr 2012 23:30:59 GMT Server: Apache Last-Modified: Mon, 04 Jul 2011 19:12:36 GMT Vary: Accept-Encoding,User-Agent Content-Encoding: gzip Cache-Control: public Expires: Fri, 25 May 2012 23:30:59 GMT Content-Length: 714 Keep-Alive: timeout=5, max=100 Connection: Keep-Alive Content-Type: text/css; charset=utf-8 Does anyone has a clue or experienced the same "problem"? thanks!

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• SQL get data out of BEGIN; ...; END; block in python

  - by Claudiu

  I want to run many select queries at once by putting them between BEGIN; END;. I tried the following: cur = connection.cursor() cur.execute(""" BEGIN; SELECT ...; END;""") res = cur.fetchall() However, I get the error: psycopg2.ProgrammingError: no results to fetch How can I actually get data this way? Likewise, if I just have many selects in a row, I only get data back from the latest one. Is there a way to get data out of all of them?

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• ruby on rails one-to-many relationship

  - by fenec

  I would like to model a betting system relationship using the power of rails. so lets start with doing something very simple modelling the relationship from a user to a bet.i would like to have a model bet with 2 primary keys. here are my migrations enter code here class CreateBets < ActiveRecord::Migration def self.up create_table :bets do |t| t.integer :user_1_id t.integer :user_2_id t.integer :amount t.timestamps end end def self.down drop_table :bets end end class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.string :name t.timestamps end end def self.down drop_table :users end end the models enter code here class Bet < ActiveRecord::Base belongs_to :user_1,:class_name=:User belongs_to :user_2,:class_name=:User end class User < ActiveRecord::Base has_many :bets, :foreign_key =:user_1) has_many :bets, :foreign_key =:user_2) end when i test here in the console my relationships I got an error enter code here u1=User.create :name="aa" = # u2=User.create :name="bb" = # b=Bet.create(:user_1=u1,:user_2=u2) *****error***** QUESTIONS: 1 How do I define the relationships between these tables correctly? 2 are there any conventions to name the attributes (ex:user_1_id...) thank you for your help

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• How to create custom omniauth provider (how to return data)

  - by user2803917

  I searched all around the net, how to create a custom provider for omniauth.. and i succedded partly.. I created a gem, and it worked perfectly, except the part, that i cant understand how to return the gathered data to sessions controller, like other providers do.. here is the code in auth gem: require 'multi_json' require 'digest/md5' require 'rest-client' module OmniAuth module Strategies class Providername < OmniAuth::Strategies::OAuth attr_accessor :app_id, :api_key, :auth def initialize(app, app_id = nil, api_key = nil, options = {}) super(app, :providername) @app_id = app_id @api_key = api_key end protected def request_phase redirect "http://valid_url" end def callback_phase if request.params['code'] && request.params['status'] == 'ok' response = RestClient.get("http://valid_url2/?code=#{request.params['auth_code']}") auth = MultiJson.decode(response.to_s) unless auth['error'] @auth_data = auth if @auth_data @return_data = OmniAuth::Utils.deep_merge(super, { 'uid' => @auth_data['uid'], 'nickname' => @auth_data['nick'], 'user_info' => { 'first_name' => @auth_data['name'], 'last_name' => @auth_data['surname'], 'location' => @auth_data['place'], }, 'credentials' => { 'apikey' => @auth_data['apikey'] }, 'extra' => {'user_hash' => @auth_data} }) end end else fail!(:invalid_request) end rescue Exception => e fail!(:invalid_response, e) end end end end and here i call it in my initializers: Rails.application.config.middleware.use OmniAuth::Builder do provider "providername", Settings.providers.providername.app_id, Settings.providers.providername.app_secret end in this code, everything works fine so far, the provider gets called, i get the info from provider, i create a hash (@auth_data) with info, but how do i return it

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• Problems with rails and saving to the database.

  - by Grantismo

  I've been having some difficulty in understanding the source of a problem. Below is a listing of the model classes. Essentially the goal is to have the ability to add sentences to the end of the story, or to add stories to an existing sentence_block. Right now, I'm only attempting to allow users to add sentences, and automatically create a new sentence_block for the new sentence. class Story < ActiveRecord::Base has_many :sentence_blocks, :dependent => :destroy has_many :sentences, :through => :sentence_blocks accepts_nested_attributes_for :sentence_blocks end class SentenceBlock < ActiveRecord::Base belongs_to :story has_many :sentences, :dependent => :destroy end class Sentence < ActiveRecord::Base belongs_to :sentence_block def story @sentence_block = SentenceBlock.find(self.sentence_block_id) Story.find(@sentence_block.story_id) end end The problem is occurring when using the show method of the Story. The Story method is as follows, and the associated show method for a sentence is also included. Sentence.show def show @sentence = Sentence.find(params[:id]) respond_to do |format| format.html {redirect_to(@sentence.story)} format.xml { render :xml => @sentence } end end Story.show def show @story = Story.find(params[:id]) @sentence_block = @story.sentence_blocks.build @new_sentence = @sentence_block.sentences.build(params[:sentence]) respond_to do |format| if @new_sentence.content != nil and @new_sentence.sentence_block_id != nil and @sentence_block.save and @new_sentence.save flash[:notice] = 'Sentence was successfully added.' format.html # new.html.erb format.xml { render :xml => @story } else @sentence_block.destroy format.html format.xml { render :xml => @story } end end end I'm getting a "couldn't find Sentence_block without and id" error. So I'm assuming that for some reason the sentence_block isn't getting saved to the database. Can anyone help me with my understanding of the behavior and why I'm getting the error? I'm trying to ensure that every time the view depicts show for a story, an unnecessary sentence_block and sentence isn't created, unless someone submits the form, I'm not really sure how to accomplish this. Any help would be appreciated.

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• Attempting to caue packet loss with netem doesn't work - possibly because of NAT (but delay does work)

  - by tomdee

  I have traffic from a WIFI access point routed via an Ubuntu box. I have two network interfaces which are NATed *filter :INPUT ACCEPT [11:690] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [37:6224] -A FORWARD -s 192.168.2.0/24 -i eth1 -o eth0 -m conntrack --ctstate NEW -j ACCEPT -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT COMMIT # Completed on Thu Mar 15 13:37:21 2012 # Generated by iptables-save v1.4.10 on Thu Mar 15 13:37:21 2012 *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -j MASQUERADE COMMIT If I run a ping app on an Android device connected to the WIFI network I can happily ping google. If I use netem to introduce some delay tc qdisc change dev eth0 root netem delay 100ms I can clearly see pings taking longer. If I use netem to introduce some packet loss tc qdisc change dev ifb0 root netem loss 50% then I see no change. Packet loss does work fine for locally generated traffic, just not for traffic coming in over the network that's being NATed. Any ideas how to sort this out?

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• ruby nested classes and modules

  - by ash34

  Hi, I am familiar with the concept of nesting classes and modules within another module and grouping them in a namespace. What is the idea / purpose behind Nesting classes within another class class A class B def method_B ... end end end 2.Nesting modules within another class class A module c def method_c ... end end end thanks, ash

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• Less reboots on Windows Server Core, is this true or just a myth?

  - by Peter Hahndorf

  Because there are less components installed on a Windows Server core OS, it needs less patches than the full OS. I read in several places that therefor it needs less reboots after patching. I'm running Server 2012 core in production since September 2012 now and I don't remember a single patch-Tuesday when I did not have to reboot the server after installing Windows updates. Are there any hard numbers out there that compare the required reboots for core vs. Full OS? Less reboots may be the main reason why people choose to go with Server core. If it actually requires just as many reboots as the full OS install, they may think again the next time they set up a server.

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• Command to escape a string in bash

  - by User1

  I need a bash command that will convert a string to something that is escaped. Here's an example: echo "hello\world"|escape|someprog Where the escape command makes "hello\world" into "hello\\world". Then, someprog can use "hello\world" as it expects. Of course, this is a simplified example of what I will really be doing.

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• ioncube not load after upgrading to php 5.4

  - by amir

  i am afraid that i broke somthing in my vps :/ i hope you can help me. i am on ubuntu-12.04-x86. and i moved to new vps so i tryied to upgrade the php to the news version from 5.3 to 5.4. anyway after installing i get this messages: fild loading /usr/lib/php5/20090626+lfs/ioncube_loader_lin_5.3.so /usr/php5/20090625+lfs/ioncube_loader_lin_5.3.so: undefined synbol: php_body_wri php 5.4.8-1~presise+1 (cli) (built(oct 29 2012) i need to mention that the server is working and php also working but when i do phpinfo there is no "with the ionCube PHP Loader v4.0.14, Copyright (c) 2002-2011, by ionCube Ltd." which was before :/ i installed with this guide:http://www.upubuntu.com/2012/03/how-to-upgrade-install-php-540-under.html i need to worry?

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• Will this class cause memory leaks, and does it need a dispose method? (asp.net vb)

  - by Phil

  Here is the class to export a gridview to an excel sheet: Imports System Imports System.Data Imports System.Configuration Imports System.IO Imports System.Web Imports System.Web.Security Imports System.Web.UI Imports System.Web.UI.WebControls Imports System.Web.UI.WebControls.WebParts Imports System.Web.UI.HtmlControls Namespace ExcelExport Public NotInheritable Class GVExportUtil Private Sub New() End Sub Public Shared Sub Export(ByVal fileName As String, ByVal gv As GridView) HttpContext.Current.Response.Clear() HttpContext.Current.Response.AddHeader("content-disposition", String.Format("attachment; filename={0}", fileName)) HttpContext.Current.Response.ContentType = "application/ms-excel" Dim sw As StringWriter = New StringWriter Dim htw As HtmlTextWriter = New HtmlTextWriter(sw) Dim table As Table = New Table table.GridLines = GridLines.Vertical If (Not (gv.HeaderRow) Is Nothing) Then GVExportUtil.PrepareControlForExport(gv.HeaderRow) table.Rows.Add(gv.HeaderRow) End If For Each row As GridViewRow In gv.Rows GVExportUtil.PrepareControlForExport(row) table.Rows.Add(row) Next If (Not (gv.FooterRow) Is Nothing) Then GVExportUtil.PrepareControlForExport(gv.FooterRow) table.Rows.Add(gv.FooterRow) End If table.RenderControl(htw) HttpContext.Current.Response.Write(sw.ToString) HttpContext.Current.Response.End() End Sub Private Shared Sub PrepareControlForExport(ByVal control As Control) Dim i As Integer = 0 Do While (i < control.Controls.Count) Dim current As Control = control.Controls(i) If (TypeOf current Is LinkButton) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, LinkButton).Text)) ElseIf (TypeOf current Is ImageButton) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, ImageButton).AlternateText)) ElseIf (TypeOf current Is HyperLink) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, HyperLink).Text)) ElseIf (TypeOf current Is DropDownList) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, DropDownList).SelectedItem.Text)) ElseIf (TypeOf current Is CheckBox) Then control.Controls.Remove(current) control.Controls.AddAt(i, New LiteralControl(CType(current, CheckBox).Checked)) End If If current.HasControls Then GVExportUtil.PrepareControlForExport(current) End If i = (i + 1) Loop End Sub End Class End Namespace Will this class cause memory leaks? And does anything here need to be disposed of? The code is working but I am getting frequent crashes of the app pool when it is in use. Thanks.

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• after_create :create a new line in DB

  - by Karl Entwistle

  Hey guys I was wondering if anyone could help me with an issue im having, basically id like to have Account.create after a PayPal notification is received, There is a simple cart model which corresponds to line_items within the cart so add_account_to_market would look like this in pseudo code def add_account_to_market if status == "Completed" find the line items(via cart_id) that correspond to the cart.id that just been paid create an account with user_id set to the current carts user id end end Ive never tried to do something like this in Rails and its not working, Ive been pulling my hair out all night trying to fix this, hopefully someone can help or point me in the right direction. Thanks :) class PaymentNotification < ActiveRecord::Base belongs_to :cart serialize :params after_create :mark_cart_as_purchased after_create :add_account_to_market private def mark_cart_as_purchased if status == "Completed" cart.update_attribute(:purchased_at, Time.now) cart.update_attribute(:paid, true) end end def add_account_to_market if status == "Completed" l = LineItem.find(:all, :conditions => "cart_id = '#{cart.id}'") for l.quantity Account.new(:user_id => cart.user_id) end end end end PS mark_cart_as_purchased method is working fine, its just the add_account_to_market im having issues with.

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• Should my validator have access to my entire model?

  - by wb

  As the title states I'm wondering if it's a good idea for my validation class to have access to all properties from my model. Ideally, I would like to do that because some fields require 10+ other fields to verify whether it is valid or not. I could but would rather not have functions with 10+ parameters. Or would that make the model and validator too coupled with one another? Here is a little example of what I mean. This code however does not work because it give an infinite loop! Class User Private m_UserID Private m_Validator Public Sub Class_Initialize() End Sub Public Property Let Validator(value) Set m_Validator = value m_Validator.Initialize(Me) End Property Public Property Get Validator() Validator = m_Validator End Property Public Property Let UserID(value) m_UserID = value End property Public Property Get UserID() UserID = m_Validator.IsUserIDValid() End property End Class Class Validator Private m_User Public Sub Class_Initialize() End Sub Public Sub Initialize(value) Set m_User = value End Sub Public Function IsUserIDValid() IsUserIDValid = m_User.UserID > 13 End Function End Class Dim mike : Set mike = New User mike.UserID = 123456 mike.Validator = New Validator Response.Write mike.UserID If I'm right and it is a good idea, how can I go a head and fix the infinite loop with the get property UserID? Thank you.

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• JQuery - Pass variables to PHP script via AJAX call and then display file

  - by hfidgen

  Hiya, I'm trying to generate Outlook event files for my events, doing so on the fly as and when someone requests it by pressing a link on the page. Here's what i've got so far, but I can't find out how to get the browser to download the content which is returned. I know how I could do this if I sent everything via _GET, but I'd prefer to do it via _POST, hence I'm going down this route.. Any thoughts? Thanks! HTML / Javascript <script> $(function() { $(".button").click(function() { // validate and process form // first hide any error messages var start = $("input#start").val(); var end = $("input#end").val(); var dataString = 'start='+ start + '&end=' + end; $.ajax({ type: "POST", url: "/calendar.php", data: dataString, success: function(data) { //Need to return the file contents somehow! } }); return false; }); }); </script> <form name="calendar" method="post" action=""> <input type="hidden" name="start" id="start" value="<?php echo $start; ?>" /> <input type="hidden" name="end" id="end" value="<?php echo $end; ?>" /> <input type="submit" name="submit" class="button" id="submit_btn" value="Outlook" /> </fieldset> </form> PHP File <?php if (isset($_POST['start'])) { $start = $_POST['start']; $end = $_POST['end']; $c = header("Content-Type: text/Calendar"); $c .= header("Content-Disposition: inline; filename=calendar.ics"); $c .= "BEGIN:VCALENDAR\n"; $c .= "VERSION:2.0\n"; $c .= "PRODID:-//xxxyyyy//NONSGML //EN\n"; $c .= "METHOD:REQUEST\n"; // requied by Outlook $c .= "BEGIN:VEVENT\n"; $c .= "UID:". $start . $end ."-" . "-xxxxyyyy.com\n"; // required by Outlook $c .= "DTSTAMP:".date('Ymd').'T'.date('His')."\n"; // required by Outlook $c .= "DTSTART:20080413T000000\n"; $c .= "SUMMARY:" . "\n"; $c .= "DESCRIPTION:" . "\n"; $c .= "END:VEVENT\n"; $c .= "END:VCALENDAR\n"; echo $c; } else { echo "Sorry you can't access this page directly"; } ?>

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• Error sending email to alias with Postfix

  - by Burning the Codeigniter

  I'm on Ubuntu 11.04 64bit. I'm trying to set up Postfix on my VPS, which has been configured but when I send an email to an alias e.g. [email protected] it will send it to [email protected]. Now when I sent the email from my GMail account, I got this returned: Delivery to the following recipient failed permanently: [email protected] Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected [email protected] (state 14). ----- Original message ----- DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=R1WtjVRWywfkWCR2g4QKbSjAfUaU9DAAMKbg9UAWqvs=; b=FiSfdhEaV4pEq/76ENlH4tvOgm35Ow3ulRg06kDYrIQTaDf3eOEgfSEgH25PjZuAj/ 7Hg1CL++o6Rt/tl80ZiR2AWekhA0zIn2JkqE7KssMG7WbBmMmbf8V9KDo2jOw+mZv+C/ KDKsQ65AudBZ/NYLDDpTT7MkKf8DzqeGCKj9MAct6sHDoC0wCciXYxNfTf+MKxrZvRHQ oICTkH5LOugKW9wEjPF2AoO8X0qgYmTLYeSUtXxu46VeNKRBGmdRkkpPOoJlQN9ank7i SW6kU6M9bk2bYOgKwV/YPsaantmYlu1XdmYx+kWeJkNJAyYOfXfZZ8WUJhbbFFD9bZCi m/hw== MIME-Version: 1.0 Received: by 10.101.3.5 with SMTP id f5mr783908ani.86.1334247306547; Thu, 12 Apr 2012 09:15:06 -0700 (PDT) Received: by 10.236.73.136 with HTTP; Thu, 12 Apr 2012 09:15:06 -0700 (PDT) Date: Thu, 12 Apr 2012 17:15:06 +0100 Message-ID: <CAN+9S2aB=xjiDxVZx3qYZoBMFD4XuadUyR_3OYWaxw1ecrZmOQ@mail.gmail.com> Subject: Test Email From: My Name <[email protected]> To: [email protected] Content-Type: multipart/alternative; boundary=001636c597eabfd21504bd7da8fd Now that I don't understand why it isn't working, my aliases are set up correctly - I see no error messages being produced in /var/log/mail.log or any other mail logs, which makes it harder for me to debug. This is my postfix configuration (postconf -n): alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = $mydomain, $myhostname, localhost, localhost.localdomain, localhost mydomain = domain.com myhostname = localhost mynetworks = 192.168.1.0/24 127.0.0.0/8 readme_directory = no recipient_delimiter = + smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes Does anyone know how to solve this specific issue?

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• Building \ installing PHP

  - by Jony

  I've followed this guide: http://www.phamviet.net/2012/06/03/centos-6-2-compile-php-5-4-2-from-source/ It all works as it should, but when I'm done and I type 'service httpd restart' following by 'php --version', it still displays the old 5.1.6 PHP version. This is 'uname -a' : Linux xxxxxx.com 2.6.32-042stab061.2 #1 SMP Fri Aug 24 09:07:21 MSK 2012 i686 i686 i386 GNU/Linux It's a VPS hosted in my main dedicated server (OpenVZ). Not sure what else to say, but I appreciate any help :) OS: CentOS 6

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• Ruby and public_method_defined? : strange behaviour

  - by aXon

  Hi there Whilst reading through the book "The well grounded Rubyist", I came across some strange behaviour. The idea behind the code is using one's own method_missing method. The only thing I am not able to grasp is, why this code gets executed, as I do not have any Person.all_with_* class methods defined, which in turn means that the self.public_method_defined?(attr) returns true (attr is friends and then hobbies). #!/usr/bin/env ruby1.9 class Person PEOPLE = [] attr_reader :name, :hobbies, :friends def initialize(mame) @name = name @hobbies = [] @friends = [] PEOPLE << self end def has_hobby(hobby) @hobbies << hobby end def has_friend(friend) @friends << friend end def self.method_missing(m,*args) method = m.to_s if method.start_with?("all_with_") attr = method[9..-1] if self.public_method_defined?(attr) PEOPLE.find_all do |person| person.send(attr).include?(args[0]) end else raise ArgumentError, "Can't find #{attr}" end else super end end end j = Person.new("John") p = Person.new("Paul") g = Person.new("George") r = Person.new("Ringo") j.has_friend(p) j.has_friend(g) g.has_friend(p) r.has_hobby("rings") Person.all_with_friends(p).each do |person| puts "#{person.name} is friends with #{p.name}" end Person.all_with_hobbies("rings").each do |person| puts "#{person.name} is into rings" end The output is is friends with is friends with is into rings which is really understandable, as there is nothing to be executed.

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• rsync does't work

  - by jspooner

  I set up a new ec2 ubuntu server and I'm unable to use rsync to push a file up. I can ssh to the machine with my keypair. I'm not sure why this looks like it works but finishes in half a second and there is nothing in /home/ubuntu on the server. ? ~ rsync -av -i ~/.ec2/my-keypair ~/Downloads/pushcom.2012-06-26T01-10-04.gz [email protected] building file list ... done >f..t.... gsg-keypair >f..t.... pushwoodcom.2012-06-26T01-10-04.gz sent 3624 bytes received 64 bytes 7376.00 bytes/sec total size is 3392 speedup is 0.92 I've tried 50 different ways of the rsync command but I can't get anything to work. Please help! Thanks

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• How do I write an RSpec test to unit-test this interesting metaprogramming code?

  - by Kyle Kaitan

  Here's some simple code that, for each argument specified, will add specific get/set methods named after that argument. If you write attr_option :foo, :bar, then you will see #foo/foo= and #bar/bar= instance methods on Config: module Configurator class Config def initialize() @options = {} end def self.attr_option(*args) args.each do |a| if not self.method_defined?(a) define_method "#{a}" do @options[:"#{a}"] ||= {} end define_method "#{a}=" do |v| @options[:"#{a}"] = v end else throw Exception.new("already have attr_option for #{a}") end end end end end So far, so good. I want to write some RSpec tests to verify this code is actually doing what it's supposed to. But there's a problem! If I invoke attr_option :foo in one of the test methods, that method is now forever defined in Config. So a subsequent test will fail when it shouldn't, because foo is already defined: it "should support a specified option" do c = Configurator::Config c.attr_option :foo # ... end it "should support multiple options" do c = Configurator::Config c.attr_option :foo, :bar, :baz # Error! :foo already defined # by a previous test. # ... end Is there a way I can give each test an anonymous "clone" of the Config class which is independent of the others?

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• CanCan polymorphic resource access problem

  - by Call 'naive' True

  Hi everybody, i don't quite understand how to restrict access to links in this particular case with CanCan. I always get "Edit" link displayed. So i believe the problem is in my incorrect definition of cancan methods(load_ and authorize_). I have CommentsController like that: class CommentsController < ApplicationController before_filter :authenticate_user! load_resource :instance_name => :commentable authorize_resource :article def index @commentable = find_commentable #loading our generic object end ...... private def find_commentable params.each { |name, value| if name =~ /(.+)_id$/ return $1.classify.constantize.includes(:comments => :karma).find(value) end } end end and i have in comments/index.html.erb following code that render file from other controller: <%= render :file => "#{get_commentable_partial_name(@commentable)}/show.html.erb", :collection => @commentable %> you can think about "#{get_commentable_partial_name(@commentable)}" like just "articles" in this case. Content of "articles/show.html.erb": <% if can? :update, @commentable %> <%= link_to 'Edit', edit_article_path(@commentable) %> | <% end %> my ability.rb: class Ability include CanCan::Ability def initialize(user) user ||= User.new # guest user if user.role? :admin can :manage, :all elsif user.role? :author can :read, [Article, Comment, Profile] can :update, Article, :user_id => user.id end end end relations with models is: class Comment < ActiveRecord::Base belongs_to :commentable, :polymorphic => true, :dependent => :destroy ... end class Article < ActiveRecord::Base has_many :comments, :as => :commentable, :dependent => :destroy ... end i have tried debug this issue like that user = User.first article = Article.first ability = Ability.new(user) ability.can?(:update, article) and i always get "= true" in ability check Note: user.role == author and article.user_id != user.id if you need more information please write thank's for your time && sorry for my english

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• fluent interface program in Ruby

  - by intern

  we have made the following code and trying to run it. class Numeric def gram self end alias_method :grams, :gram def of(name) ingredient = Ingredient.new(name) ingredient.quantity=self return ingredient end end class Ingredient def initialize(n) @@name= n end def quantity=(o) @@quantity = o return @@quantity end def name return @@name end def quantity return @@quantity end end e= 42.grams.of("Test") a= Ingredient.new("Testjio") puts e.quantity a.quantity=90 puts a.quantity puts e.quantity the problem which we are facing in it is that the output of puts a.quantity puts e.quantity is same even when the objects are different. what we observed is that second object i.e 'a' is replacing the value of the first object i.e. 'e'. the output is coming out to be 42 90 90 but the output required is 42 90 42 can anyone suggest why is it happening? it is not replacing the object as object id's are different..only the values of the objects are replaced.

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• fluent interface program in Ruby

  - by intern

  we have made the following code and trying to run it. class Numeric def gram self end alias_method :grams, :gram def of(name) ingredient = Ingredient.new(name) ingredient.quantity=self return ingredient end end class Ingredient def initialize(n) @@name= n end def quantity=(o) @@quantity = o return @@quantity end def name return @@name end def quantity return @@quantity end end e= 42.grams.of("Test") a= Ingredient.new("Testjio") puts e.quantity a.quantity=90 puts a.quantity puts e.quantity the problem which we are facing in it is that the output of puts a.quantity puts e.quantity is same even when the objects are different. what we observed is that second object i.e 'a' is replacing the value of the first object i.e. 'e'. the output is coming out to be 42 90 90 but the output required is 42 90 42 can anyone suggest why is it happening? it is not replacing the object as object id's are different..only the values of the objects are replaced.

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• LPR command won't recognize CUPS printer

  - by Datapimp23

  I have a cups server with one shared printer configured on it. It prints test pages without problems. printername (Idle, Accepting Jobs, Shared) Description: desc Location: Driver: Zebra ZPL Label Printer (grayscale, 2-sided printing) Connection: socket://172.20.50.26 Defaults: job-sheets=none, none media=oe_w288h432_4x6in sides=one-sided This is the output from lpstat -t. it shows that the printer is idle and accepting requests admin@SERVER:~$ lpstat -t scheduler is running no system default destination device for printername: socket://172.20.50.26 printername accepting requests since Thu 26 Jan 2012 01:29:35 PM CET printer printername is idle. enabled since Thu 26 Jan 2012 01:29:35 PM CET Now when I want to send a printjob to it via an LPR command it won't recognize the printer /usr/bin/lpr -P printername test.pdf Result lpr: ttn_seg_zebra1: unknown printer What am I missing here ?

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• RavenDB - Can I create/query an index, from an application that doesn't share the CLR objects that were persisted?

  - by Jaz Lalli

  This post goes some way to answering this question (I'll include the answer later), but I was hoping for some further details. We have a number of applications that each need to access/manipulate data from Raven in their own way. Data is only written via the main web application. Other apps include batch-style tasks, reporting etc. In an attempt to keep each of these as de-coupled as possible, they are separate solutions. That being the case, how can I, from the reporting application, create indexes over the existing data, using my locally defined types? The answer from the linked question states As long as the structure of the classes you are deserializing into partially matches the structure of the data, it shouldn't make a difference. The RavenDB server doesn't care at all what classes you use in the client. You certainly could share a dll, or even share a portable dll if you are targeting a different platform. But you are correct that it is not necessary. However, you should be aware of the Raven-Clr-Type metadata value. The RavenDB client sets this when storing the original document. It is consumed back by the client to assist with deserialization, but it is not fully enforced It's the first part of that that I wanted clarification on. Do the object graphs for the docs on the server and types in my application have to match exactly? If the Click document on the server is { "Visit": { "Version": "0", "Domain": "www.mydomain.com", "Page": "/index", "QueryString": "", "IPAddress": "127.0.0.1", "Guid": "10cb6886-cb5c-46f8-94ed-4b0d45a5e9ca", "MetaData": { "Version": "1", "CreatedDate": "2012-11-09T15:11:03.5669038Z", "UpdatedDate": "2012-11-09T15:11:03.5669038Z", "DeletedDate": null } }, "ResultId": "Results/1", "ProductCode": "280", "MetaData": { "Version": "1", "CreatedDate": "2012-11-09T15:14:26.1332596Z", "UpdatedDate": "2012-11-09T15:14:26.1332596Z", "DeletedDate": null } } Is it possible (and if so, how?), to create a Map index from my application, which defines the Click class as follows? class Click { public Guid Guid {get;set;} public int ProductCode {get;set;} public DateTime CreatedDate {get;set;} } Or would my class have to be look like this? (where the custom types are defined as a sub-set of the properties on the document above, with matching property names) class Click { public Visit Visit {get;set;} public int ProductCode {get;set;} public MetaData MetaData {get;set;} } UPDATE Following on from the answer below, here's the code I managed to get working. Index public class Clicks_ByVisitGuidAndProductCode : AbstractIndexCreationTask { public override IndexDefinition CreateIndexDefinition() { return new IndexDefinition { Map = "from click in docs.Clicks select new {Guid = click.Visit.Guid, ProductCode = click.ProductCode, CreatedDate = click.MetaData.CreatedDate}", TransformResults = "results.Select(click => new {Guid = click.Visit.Guid, ProductCode = click.ProductCode, CreatedDate = click.MetaData.CreatedDate})" }; } } Query var query = _documentSession.Query<ReportClick, Clicks_ByVisitGuidAndProductCode>() .Customize(x => x.WaitForNonStaleResultsAsOfNow()) .Where(x => x.CreatedDate >= start.Date && x.CreatedDate < end.Date); where Click is public class Click { public Guid Guid { get; set; } public int ProductCode { get; set; } public DateTime CreatedDate { get; set; } } Many thanks @MattJohnson.

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