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• RoR associations through or not through?

  - by showFocus

  I have four models that are related to one another, the way I have it setup at the moment is I have to select a county, region and country when entering a new city. class Country < ActiveRecord::Base has_many :regions has_many :counties has_many :cities end class Region < ActiveRecord::Base has_one :country has_many :counties has_many :cities end class County < ActiveRecord::Base has_one :country has_one :region has_many :cities end class City < ActiveRecord::Base has_one :country has_one :region has_one :county end Would it be better to use the :through symbol in the association? So I could say the city: has_one :country, :through => :region Not sure if this is correct, I have read how :through works but I'm not sure if this is the best solution. I am a newbie and while I'm not struggling with the syntax and how things work, it would be good to get opinions on best practices and the way things should be done from some rails wizards! Thanks in advance.

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• Totally Sweet Horizontal Rules in LaTeX

  - by Arcane

  I have been trying to find a way to easily drop a nice horizontal rule into a LaTeX document. \hline just makes a line across the page. It would seem that some package must provide something that is maybe half a page wide, with little bedknobs on the ends or something to act as a nice section marker for paragraphs. Any ideas? Or am I boned, and need to come up with my own macro to create such a beast?

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• Problems with classes (super new)

  - by user260036

  Hi, I've problems to figure it out what's happening in the following exercise, I'm learning Smalltalk, so I'm newbie. Class Anew ^super new initialize. Ainitialize a:=0. Class Bnew: aParameter |instance| instance := super new. instance b: instance a + aParameter. ^instance Binitialize b:=0. The problem says what happen when the following code is executed: B new:10. But I can't not figure it out why instance variable does not belong to A class. Thanks

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• Need help joining tables...

  - by yuudachi

  I am a MySQL newbie, so sorry if this is a dumb question.. These are my tables. student table: SID (primary) student_name advisor (foreign key to faculty.facultyID) requested_advisor (foreign key to faculty.facultyID) faculty table: facultyID (primary key) advisor_name I want to query a table that shows everything in the student table, but I want advisor and requested_advisor to show up as names, not the ID numbers. so like it displays like this on the webpage: Student Name: Jane Smith SID: 860123456 Current Advisor: John Smith Requested advisor: James Smith not like this Student Name: Jane Smith SID: 860123456 Current Advisor: 1 Requested advisor: 2 SELECT student.student_name, SID, student_email, faculty.advisor_name FROM student INNER JOIN faculty ON student.advisor = faculty.facultyID; this comes out close, but I don't know how to get the requested_advisor to show up as a name.

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• Ruby number_to_currency displays a totally wrong number!

  - by SueP

  Greetings! I’m an old Delphi programmer making the leap to the Mac, Ruby, Rails, and web programming in general. I’m signed up for the Advanced Rails workshop at the end of the month. In the meantime, I’ve been working on porting a mission-critical (of course) app from Delphi to RAILS. It feels like I’ve spent most of the past year with my head buried in a book or podcast. Right now, I’ve hit a major issue and I’m tearing my hair out. I literally don’t know where to go with this, I desperately don’t want to deploy with this bug, and I’m feeling a bit frantic. (The company database is currently running on an ancient XP box that’s looking rustier by the day.) So, I set up a test database that shows the problem. I’m running: OS/X 10.6.3 Rails 2.3.5 ruby 1.8.7 (2009-06-08 patchlevel 173) [universal-darwin10.0] MySQL 5.1.38-log via socket MySQL Client Version 5.1.8 ActiveRecord::Schema.define(:version => 20100406222528) do create_table “money”, :force => true do |t| t.decimal “amount_due”, :precision => 10, :scale => 2, :default => 0.0 t.decimal “balance”, :precision => 10, :scale => 2, :default => 0.0 t.text “memofield” t.datetime “created_at” t.datetime “updated_at” end The index view is right out of the generator, slightly modified to add the formatting that's breaking on me. Listing money <table> <tr> <th>Amount</th> <th>Amount to_s </th> <th>Balance to $</th> <th>Balance with_precision </th> <th>Memofield</th> </tr> <% @money.each do |money| %> <tr> <td><%=h money.amount_due %></td> <td><%=h money.amount_due.to_s(‘F’) %></td> <td><%=h number_to_currency(money.balance) %></td> <td><%=h number_with_precision(money.balance, :precision => 2) %></td> <td><%=h money.memofield %></td> <td><%= link_to ‘Show’, money %></td> <td><%= link_to ‘Edit’, edit_money_path(money) %></td> <td><%= link_to ‘Destroy’, money, :confirm => ‘Are you sure?’, :method => :delete %></td> </tr> *<% end %> *</table> <%= link_to ‘New money’, new_money_path %> This seemed to work pretty well. Then I started testing with production data and hit a major problem with number_to_currency. The number in the database is: 10542.28, I verified it with the MySQL Query Browser. RAILS will display this as 10542.28 unless I call number_to_currency, then that number is displayed as: $15422.80 The error seems to happen with any number between 10,000.00 and 10,999.99 So far, I haven’t seen it outside of that range, but I obviously haven’t tested everything. I guess my workaround is to remove number_to_currency, but that leaves the views looking really sloppy and unprofessional. The formatting is messed up, things don’t line up properly and I can’t force the display to 2 decimal places. I’m seriously hoping there is an easy fix for this. I can’t imagine this being a widespread problem. It would affect so many people that someone would have fixed it! But I don’t know where to go from here. I’d desperately like some help. (Later – number_with_precision fails the same way number_to_currency does.) Sue Petersen

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• PHP/Mysql issues

  - by queryne

  Php/my sql newbie question. I have a database I've imported into my local phpmyadmin. However it seems I can't access it from my a php application. The connection string seems right and when i try to authenticate user credentials to access database information, no problems. However authenticate everyone and knows when i put in fake credentials. Still it won't pull any other information from the database. For instance, once a users login they should see something like, "Hello username"... that kind of thing. At this point I see "Hello" without the username. Any ideas what i might be missing?

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• Flash: Am i totally misunderstanding Event Listening?

  - by Kohan

  I don't know why but i am having trouble getting my head round event dispatching. Take this for example. someClass():Void{ this.addEventListener("onChange",someObj); } Am i right in assuming this means that someClass is listening for an onChange event and when it gets it, it is then going to fire the onChange method on someObj? Thanks, Kohan.

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• WCF for the totally clueless

  - by Kyralessa

  I've been hearing about WCF for a couple of years now, and I still don't get it. I understand that it's supposed to be a replacement for web services, remoting, MSMQ, and a few other things. The trouble is, every tutorial I find assumes that I've done one of those things, and it tends to follow the line of "Here are the differences; you know the rest." But I don't know the rest! So: Do you know of any tutorial articles, books, etc. that assume that the reader knows C# or VB .NET, but nothing about web services, MSMQ, remoting, and all those other technologies that WCF replaces?

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• PHP/MySQL Database Issues

  - by queryne

  PHP/MySQL newbie question. I have a database I've imported into my local phpmyadmin. However it seems I can't access it from my a php application. The connection string seems right and when I try to authenticate user credentials to access database information, no problems. However authenticate everyone and knows when I put in fake credentials. Still it won't pull any other information from the database. For instance, once a users login they should see something like, "Hello username", that kind of thing. At this point I see "Hello" without the username. Any ideas what i might be missing?

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• Ant build scripts totally hangs, with no messages in console

  - by voipsecuritydigest.com

  I have build.xml for my project, but even this small piece of code <target name="init"> <tstamp/> <!-- Create the build directory structure used by compile --> <mkdir dir="${build}"/> </target> It doesn't run Console is empty but process is active. I still can terminate it over STOP button In same time I cannot debug it as well, same stuff active process no output in console and I can wait forever! Any ideas? JDK 1.6.0_14 Eclipse 3.5.1

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• Avoid loading unnecessary data from db into objects (web pages)

  - by GmGr

  Really newbie question coming up. Is there a standard (or good) way to deal with not needing all of the information that a database table contains loaded into every associated object. I'm thinking in the context of web pages where you're only going to use the objects to build a single page rather than an application with longer lived objects. For example, lets say you have an Article table containing id, title, author, date, summary and fullContents fields. You don't need the fullContents to be loaded into the associated objects if you're just showing a page containing a list of articles with their summaries. On the other hand if you're displaying a specific article you might want every field loaded for that one article and maybe just the titles for the other articles (e.g. for display in a recent articles sidebar). Some techniques I can think of: Don't worry about it, just load everything from the database every time. Have several different, possibly inherited, classes for each table and create the appropriate one for the situation (e.g. SummaryArticle, FullArticle). Use one class but set unused properties to null at creation if that field is not needed and be careful. Give the objects access to the database so they can load some fields on demand. Something else? All of the above seem to have fairly major disadvantages. I'm fairly new to programming, very new to OOP and totally new to databases so I might be completely missing the obvious answer here. :)

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• Returning an integer from a select box - JavaScript

  - by Ross

  Very simply, I want to be able to access the year from the select box as an integer. In my test, my alertbox is telling me the value is undefined. <form name="form1" method="post" action=""> <label>birth year <select name="birth year" id="dueYear"> <OPTION VALUE='' SELECTED>--Year--</OPTION> <OPTION VALUE='2011'>2011</OPTION> <OPTION VALUE='2010'>2010</OPTION> <OPTION VALUE='2009'>2009</OPTION></SELECT> </select> </label> </form> <script type="text/javascript"> var dueDateYear = parseInt(document.getElementById("dueYear")); </script> <button onclick="alert(dueDateYear)">Click Me!</button> All I want it to do, is tell me the year I have selected -- any help would be appreciated, I am a newbie :(

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• Newbie, deciding Python or Erlang

  - by Joe

  Hi Guys, I'm a Administrator (unix, Linux and some windows apps such as Exchange) by experience and have never worked on any programming language besides C# and scripting on Bash and lately on powershell. I'm starting out as a service provider and using multiple network/server monitoring tools based on open source (nagios, opennms etc) in order to monitor them. At this moment, being inspired by a design that I came up with, to do more than what is available with the open source at this time, I would like to start programming and test some of these ideas. The requirement is that a server software that captures a stream of data and store them in a database(CouchDB or MongoDB preferably) and the client side (agent installed on a server) would be sending this stream of data on a schedule of every 10 minutes or so. For these two core ideas, I have been reading about Python and Erlang besides ruby. I do plan to use either Amazon or Rackspace where the server platform would run. This gives me the scalability needed when we have more customers with many servers. For that reason alone, I thought Erlang was a better fit(I could be totally wrong, new to this game) and I understand that Erlang has limited support in some ways compared to Ruby or Python. But also I'm totally new to the programming realm of things and any advise would be appreciated grately. Jo

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• Need help connecting to NAS externally-port forwarding and DDNS newbie

  - by Joel

  Hi folks, I just picked up a synology NAS, and I'm loving it for internal use, but I want to be able to access the NAS externally-both from my iPhone (3G) and from the net. I have a Linksys WRT54G-TM router. My first question is whether I have set up the dyndns correctly. On my computer that is on my network, if I put in mydomain.dyndns.org, I am taken to a password popup and when I enter my router login and password, my router admin page opens up. On the same computer, I get the same results if I use my external IP address, and if I use my internal IP 192.168.0.1 So that is all as expected. However, when I go to my iphone and turn off wifi, and try to connect with 3g to the external IP or the dnydns domain, I just get an error "Safari could not open the page because the server stopped responding". What's up?

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• IIS 6 / Win NT Server 2003: Creating Subdomain for Mailserver (newbie)

  - by Fuxi

  hi all, what's the easiest way to create a subdomain for the mailserver (eg. mail.mydomain.com) and connect it to the mailserver? it should be possible when adding new domains that there's the mail-subdomain by default. thx

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• Ubuntu Newbie Needs Assistance!!

  - by Steve Greene

  New Ubuntu User Needs Help!- version 9.10 does not communicate with laptop Hello folks, Several days ago, I installed Ubuntu 9.10 onto my Acer Aspire 3100 laptop, running it alongside Widows Vista as a dual-bootable system. Creation of the Ubuntu boot CD went fine, and the installation onto my hard drive was flawless. Ubuntu opens and behaves as I would expect, except for one little problem. For reasons unknown to me, Ubuntu is not communicating with my laptop's networking hardware, and I have no internet connectivity, even when sitting directly under the wireless router at the local library (literally), which puts out a wickedly-fast signal that my Windows Vista OS auto-detects and immediately connects to. Up in the right side of the Ubuntu desktop, I click on the network icon and it does not show a wireless connection at all, even though I am only a few feet from the router. At home, where I use a dialup modem, I also see no means of getting online. My modem is an HDAUDIO Soft Data Fax Modem with Smart CP,manufactured by CXT (Conexant Systems Inc., file version 4.0.13.0, and the driver version is 7.58.0.0). I desparately wish to convert to Ubuntu. I used Mac for ten years, and then Windows for ten years. Now, after 20 years, I want to live out my days as an open-source Ubuntu fanatic. I am ready to give the old status quo the boot! I am an advanced computer user, but I am not a programmer. I seek a solution that is user-friendly for normal people, something equivalent to a driver that I can easily install or activate that will allow Ubuntu to see my hardware and get me connected. Can anyone help me over this hopefully-little glitch so that I can move on in total Ubuntu bliss? My processor is a Mobile AMD Sempron Processor 3500+ at 1.80 GHz, 1.50 GB RAM, and a 32-bit Operating System. I am running Windows Vista Home Basic, Service Pack 2. My current email is [email protected] if you have a workable solution that does not require programmer status to implement. Surely this must be a simple fix that I simply am overlooking, but being the new guy on the block, I have yet to be enlightened. Thanks for your help in coming up to speed!! Steve Wanna' be Ubuntu Fanatic "If you're not living on the edge, you're taking up too much space."

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• Linux Newbie: SSH or VNC for linux admin tasks

  - by Dirk

  Longtime Windows user, looking to get my feet wet with Linux. Since Windows makes comparatively little use of the command line, I'm naturally more comfortable with GUI tools for remote server administration tasks. However, before i rush out and install a VNC server on my Linux box, I want to get a sense of how many of Linux's various packages actually offer GUI front end. If not many, then it's probably not worth the effort.

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• VMWare Newbie - looking for hardware recommendations and help :) [closed]

  - by Dan

  I am looking for some hardware recommendations on an upcoming virtualization project. We are a small company (80 users - 25 in site 1, 55 in site 2) currently using Windows Server 2003 - no VM servers yet. Our AD is setup where site 1 is the root domain and site 2 is a subdomain/subnet - connected by T1 and VPN for failover. The current DC's also server as file servers, print servers, AntiVirus servers. Email is in the cloud. Additionally then in site 1 we have 3 additional member servers - one running IBM Websphere for a customer specific app, one running Infor PowerLink (no real heavy load) and another that we use for Virtual Studio apps and also runs DirSync for Exchange Online. No heavy workloads on any of these machines really. We also have an AS400 box that we run ERP/CRM software on that site 2 connects to over the WAN link. In site 2 we also have a SQL machine that runs on Win2K server. Database files are not large less than 5 GB. Light to Medium workload on this machine. File servers in each site store less than 500 GB data and probably won't grow to more than 1TB in the next 5 years. I am looking to go to VMWare in both sites and virtualize all servers. What recommendations do you have for server, storage hardware? Is it safe to virtualize all of your DC's? Any help or advice would be greatly appreciated. Thanks.

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• Newbie one: Virtual Networks - Hyper-V - Remote Destktop - Only one phisical NIC

  - by josecortesp

  Hello everyone, I'll try to explain my situation and I'll apreciate any help: I have a phisical server (quad core, 4Gb ram, 1TB raid 10, etc) with Win Server 2008 R2 enterprise, running IIS, Printing, etc... Also, I want to set up 2 virtual Servers with 2008 R2 standart one with SQL Server and the other with Team Foundation. What i need is: Being able to access from inside the private phisical network, to Remote Desktops on each of the Virtual and the phisical Servers Had Access from the outside, using a router and port Forwarding, to the TFS server and the IIS server (one is virtualized, the other is phisical) This is it, but note that I only have one Phisical Nic. How do I configure this to work. When i set up the hyper-v role, on the wizard something like it showed up but I don't remmember what i choose, and right now, I cannot access none of the servers from remote desktop, not even from the phisical private network. Can anybody point me, what can i do? Thanks in advance (sorry 4 my english, i'm a spanish talker and my english isn't that good)

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• newbie hard drive upgrade question

  - by musoNic80

  I have an Acer Aspire 3500WLMi laptop. It currently has a 40gb hard drive which I would like to upgrade. Could someone talk me through the process? I've listed my concerns/queries... Can I buy and install any 2.5" SATA or IDE hard drive into this machine? Should I buy somesort of USB caddy and clone my existing drive onto the new one via USB then physically swap the drives over? My current disk is partitioned to include a small amount of space for a Ubuntu install. Will a clone keep the current partition sizes or is it best for me to repartition once I've cloned? Many thanks.

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• Newbie: VirtualBox "no bootable medium found"

  - by Newton Falls

  My first foray into VM land so please excuse the stupidity expressed below. Running VirtualBox on Kubuntu 9.10 and trying to set up a VM running Windows 7. Windows 7 came installed and is functional as a dual-boot but I want to stay in kubuntu hence the VM. Received "Fatal: no bootable medium found" when trying to start a VM. Not surprising since VBox never gave me an option (that I recognized anyway) to tell it to look on the hard drive. I did not receive a CD of Windows 7 with the machine. How can I tell VirtualBox to grab what it needs from the hard drive? Or am I out of luck because I don't have a CD? Update: This might not be possible. The installed Windows 7 is useful only to pull the installation key. It is easier to just to download or get an ISO from a friend and enter in your own key.

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• Please explain some of the features of URL Rewrite module for a newbie [closed]

  - by kunjaan

  I am learning to use the IIS Rewrite module and some of the "features" listed in the page is confusing me. It would be great if somebody could explain them to me and give a first hand account of when you would use the feature. Thanks a lot! Rewriting within the content of specific HTML tags Access to server variables and HTTP headers Rewriting of server variables and HTTP request headers What are the "server variables" and when would you redefine or define them? Rewriting of HTTP response headers HtmlEncode function Why would you use an HTMLEncode in the server? Reverse proxy rule template Support for IIS kernel-mode and user-mode output caching Failed Request Tracing support

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• 'IPv6' Newbie with IPv6 address assigment

  - by Cute Puppy

  I am new to IP v6 and I am looking to translate some existing private IPv4 addresses into v6 address assignment. Can someone please help me to answer/explain the questions below? If I have an v4 address of: 10.10.0.0/22 10.10.1.0/22 10.10.2.0/22 10.10.3.0/22 10.10.8.0/20 10.20.1.0/24 What will the new v6 address to be? I have been looking online @ http://www.subnetonline.com/pages/subnet-calculators/ipv4-to-ipv6-converter.php or other sites, Seems like they translated it directly to be: fe80::a0a:0 /118 fe80::a0a:100 /118 fe80::a0a:200 /118 fe80::a0a:300 /118 fe80::a0a:800 /118 fe80::a14:100 /120 Can someone please explain to me how we get to /118 from either "/22 or /24" (1. and 5) In addition, I would like to create the new private address based on the Unique local address "fc00::/16" How do I expand from there? Any help is greatly appreciated it!! Thanks,

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• Exchange 2007 Backup - For a newbie

  - by mew3900

  I am trying to setup an exchange 2007 backup solution. After doing a lot of reading, Microsoft have decided in server 2008 unless you are willing to spend a great deal on a 3rd party solution you are pretty stuck! Essentially what I have been asked to do is perform an off-line file backup of our current exchange server and replicate this onto a new 2nd server. The reasoning behind this is that we need to upgrade our current installation of exchange 2007 to SP2 so that the exchange plug-in for windows server backup will be available to us. From this I can then actually take an exchange aware backup weekly and take it off site. Ideally then also we can migrate to this new server and keep the old one as a fail over. Is there a way I can copy across the files required onto a second server, although I doubt very much it is that simple. I may be barking up completely the wrong tree, however I have very limited knowledge with Exchange and any help and advice on how I would resolve this would be much appreciated. Thanks in advance

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• jQuery issue - #<an Object> has no method

  - by Shaun

  I've tried a veriety of jQuery plugins recently and I keep getting this error … … regardless of what plugin I try to use. I've checked the links to the JS files which are all there and working fine. I'm using Drupal if that makes any difference. I've run the plugins away from the main site to demonstrate that they are working and that I am doing things right with 100% success. Any ideas? Update: My jQuery file called in the footer: $(document).ready(function() { $('#footer_holder').hide(); // Fancy Box $("a.fancybox").fancybox({ 'hideOnContentClick': true, 'titlePosition' : 'over', 'transitionIn' : 'elastic', 'transitionOut' : 'elastic', 'speedIn' : 600, 'speedOut' : 200, 'overlayShow' : false, }); $("#homepage_slider").easySlider({ auto: true, continuous: true, }); }); *note - fancy box works fine. jQuery is sorted out by Drupal. I'm running version 1.4

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