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• Suggestions on how to track tag count for a particular object

  - by Robin Fisher

  Hi, I'm looking for suggestions on how to track the number of tags associated with a particular object in Rails. I'm using acts_as_taggable_on and it's working fine. What I would like to be able to do is search for all objects that have no tags, preferably through a scope i.e. Object.untagged.all My first thought was to use an after_save callback to update an attribute called "taggings_count" in my model: def update_taggings_count self.taggings_count = self.tag_list.size self.save end Unfortunately, this does the obvious thing of putting me in an infinite loop. I need to use an after_save callback because the tag_list is not updated until the main object is saved. Would appreciate any suggestions as I'm on the verge of rolling my own tagging system. Regards Robin

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• Setting tabindex in dynamic table vertically then horizontally

  - by Wil

  I have a page that is currently generating dynamically created textboxes in a table format. The users are requesting that the tab order be changed from horizontal-vertical to vertical-horizontal. I know that you can use the tabindex attribute to control the tab ordering, but I can't for the life of me figure out the right way to get the sequential number properly for the textboxes. I guess this is more of a math question than anything else! FYI, the textboxes are made while looping two different collections. First collection looped to make the rows, for each row, second collection (which is a property of the first collection objects) is looped to create the columns. Any help would be greatly appreciated. Thanks!

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• Hierarchical Hibernate, how many queries are executed?

  - by ghost1

  So I've been dealing with a home brew DB framework that has some seriously flaws, the justification for use being that not using an ORM will save on the number of queries executed. If I'm selecting all possibile records from the top level of a joinable object hierarchy, how many separate calls to the DB will be made when using an ORM (such as Hibernate)? I feel like calling bullshit on this, as joinable entities should be brought down in one query , right? Am I missing something here? note: lazy initialization doesn't matter in this scenario as all records will be used.

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• HBase as web app backend

  - by NathanD

  Can anyone advise if it is a good idea to have HBase as primary data source for web-based application? My primary concern is HBase's response time to queries. Is it possible to have sub-second response? edit: more details about the app itself. Amount of data: ~500GB of text data, expect to reach 1TB soon Number of concurrent users using the app: up to 50 The app will be used to present reports about data stored in HBase, like how many times keyword "X" occured in last 24h. For ~80% of requests from that app I will know the exact key, 20% will be scans (I'm looking into HBase schema design related topics to make it run fast)

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• Fixing javascript Array functions in Internet Explorer (indexOf, forEach, etc)

  - by Chas Emerick

  As detailed elsewhere, and otherwise apparently well-known, Internet Explorer (definitely 7, and in some instances, 8) do not implement key functions, in particular on Array (such as forEach, indexOf, etc). There are a number of workarounds here and there, but I'd like to fold a proper, canonical set of implementations into our site rather than copy and paste or hack away at our own implementations. I've found js-methods, which looks promising, but thought I'd post here to see whether another library comes more highly-recommended. A couple of misc. criteria: the lib should just be a no-op for those functions that a browser already has implementations for (js-methods appears to do quite well here) non-GPL, please, though LGPL is acceptable

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• How to find GTK version in PHP-GTK2?

  - by aidave

  This one is driving me nuts. According to GTK's site, there exists GTK_MAJOR_VERSION, GTK_MINOR_VERSION, and GTK_MICRO_VERSION constants. However, none of these work: echo GTK_MAJOR_VERSION; echo GtK::MAJOR_VERISON; echo Gtk::GTK_MAJOR_VERSION; etc Also, Gtk::check_version(2,12,0) always fails even though I have a higher version. I'd like to simply get the actual version number and not rely on check_version, which seems unreliable. How can I do this? I need to do it within PHP, platform independent.

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• Google Suggest - What determines the sort order of suggested queries on google?

  - by John Himmelman

  How is this sort order determined? Is it ranked by popularity, number of results, or a mysterious google algorithm? Does there algorithm take into account the search popularity of a query (using google-trends data or something)? Edit: I found a news article dating back to when google suggest was made public in 2004. Here is an excerpt... How does it work? "Our algorithms use a wide range of information to predict the queries users are most likely to want to see. For example, Google Suggest uses data about the overall popularity of various searches to help rank the refinements it offers." Source: http://www.free-seo-news.com/newsletter138.htm

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• storing multiple values as binary in one field

  - by Enghoej

  Hi I have a project where I need to store a large number of values. The data is a dataset holding 1024 2Byte Unsigned integer values. Now I store one value at one row together with a timestamp and a unik ID. This data is continously stored based on a time trigger. What I would like to do, is store all 1024 values in one field. So would it be possible to do some routine that stores all the 1024 2byte integer values in one field as binary. Maybe a blobfield. Thanks. Br. Enghoej

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• Wizard based feature install in sharepoint 2007?

  - by JL

  I have a feature that gets installed using a WSP package, when the feature is activated, I would like the following to happen: The feature will contain a list definition. When the feature gets activated by an end user (the user physically clicks the feature activation button in site features admin) - I would like a modal dialog to appear then ask the user to provide some additional details. 3.1 The additional details will be supplying a certain number of names. For example Mary, John, Peter. Form logistics I can handle. Once the form is complete that information needs to somehow get back to the feature reciever, so that I can then take the base list definition, and use it as a template to create list instances for all the names supplied - so if user had supplied Mary and Peter, then 2 list instances will be created when this feature is activated. Is any of this possible with MOSS 2007? Thank you

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• Regexp look-behind to match internet speeds

  - by Sandman

  So the user may search for "10 mbit" after which I want to capture the "10" so I can use it in a speed-search rather than a string-search. This isn't a problem, the below regexp does this fine: if (preg_match("/(\d+)\smbit/", $string)){ ... } But, the user may search for something like "10/10 mbit" or "10-100 mbit". I don't want to match those with the above regexp - they should be handled in another fashion. So I would like a regexp that matches "10 mbit" if the number is all-numeric as a whole word (i.e. contained by whitespace, newline or lineend/linestart) Using lookbehind, I did this: if (preg_match("#(?<!/)(\d+)\s+mbit#i", $string)){ Just to catch those that doesn't have "/" before them, but this matched true for this string: "10/10 mbit" so I'm obviously doing something wrong here, but what?

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• What does this JavaScript error mean?

  - by Tommy

  Using the “Venkman” JavaScript debugger for Mozilla and getting the following error: XML Parsing Error: not well-formed Location: x-jsd:source?location=http%3A%2F%2F192.168.1.150%2Fscript.js&instance=337 Line Number 557, Column 50:<line><margin x='t'> - </margin><num> 554</num> ?? valid = false;</line> Functions works but I don't understand the error. Any help is appreciated. Thanks. function ValidateCheckBoxes() { var valid; $(document).ready(function(){ if($('input[@name=boxesA]:checked').size() == 0) {     valid = false; } else { valid = true; } }); return valid; }

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• net.sf.hibernate.PropertyAccessException: Null value was assigned to a property of primitive type

  - by lot

  Hi! What might be reasons for running in the quoted exception upon a HQL select, when there is actually no NULL value in the respective field in the database? I've checked the database multiple times. I've manually submitted the query statement produced by hibernate (extracted from debug). Null values for the respective field are actually never returned. However, the corresponding row in the database is in fact nullable. Does hibernate care about the data base definition? I know, I could simple change the filed to a wrapper type, but we have a number of such fields in a legacy application and this only occurs upon a single query. I'm just wondering about the actual reason for getting this exception only with a single property. Any hints would be greatly appreciated.

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• Keep local MS SQL 2008 DB table and remote SQL Azure DB table in sync

  - by Boomerangertanger

  Hi there, I have a dedicated server which hosts a Windows Service which does a lot of very heavy load stuff and populates a number of SQL Server database tables. However, of all the database tables it populates and works with, I want only one to be synchronised with a remote SQL Azure DB table. This is because this table holds what I called Resolved data, which is the end result of the Windows Service's work. I would like to keep a SQL Azure database table in sync with this database table. As far as I understand, my options are: Move everything onto Azure (but that involves a massive development overhead and risk) Have another Windows Service on the dedicated server which essentially looks at changed records since the last update and then manually update the SQL Azure table

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• What is it about Fibonacci numbers?

  - by Ian Bishop

  Fibonacci numbers have become a popular introduction to recursion for Computer Science students and there's a strong argument that they persist within nature. For these reasons, many of us are familiar with them. They also exist within Computer Science elsewhere too; in surprisingly efficient data structures and algorithms based upon the sequence. There are two main examples that come to mind: Fibonacci heaps which have better amortized running time than binomial heaps. Fibonacci search which shares O(log N) running time with binary search on an ordered array. Is there some special property of these numbers that gives them an advantage over other numerical sequences? Is it a density quality? What other possible applications could they have? It seems strange to me as there are many natural number sequences that occur in other recursive problems, but I've never seen a Catalan heap.

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• What are some useful SQL statements that should be known by all developers who may touch the Back en

  - by Jian Lin

  What are some useful SQL statements that should be known by all developers who may touch the Back end side of the project? (Update: just like in algorithm, we know there are sorting problems, shuffling problems, and we know some solutions to them. This question is aiming at the same thing). For example, ones I can think of are: Get a list of Employees and their boss. Or one with the employee's salary greater than the boss. (Self-join) Get a list of the most popular Classes registered by students, from the greatest number to the smallest. (Count, group by, order by) Get a list of Classes that are not registered by any students. (Outer join and check whether the match is NULL, or by Get from Classes table, all ClassIDs which are NOT IN (a subquery to get all ClassIDs from the Registrations table)) Are there some SQL statements that should be under the sleeve of all developers that might touch back end data?

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• [Cocoa] NSImage transparency

  - by ndg

  I'm trying to set a custom drag icon for use in an NSTableView. Everything seems to work but I've run into a problem due to my inexperience with Quartz. - (NSImage *)dragImageForRowsWithIndexes:(NSIndexSet *)dragRows tableColumns:(NSArray *)tableColumns event:(NSEvent *)dragEvent offset:(NSPointPointer)dragImageOffset { NSImage *dragImage = [NSImage imageNamed:@"icon.png"]; NSString *count = [NSString stringWithFormat:@"%d", [dragRows count]]; [dragImage lockFocus]; [dragImage compositeToPoint:NSZeroPoint fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:0.5]; [count drawAtPoint:NSZeroPoint withAttributes:nil]; [dragImage unlockFocus]; return dragImage; } Essentially what I'm looking to do is render my icon.png file with 50% opacity along with an NSString which shows the number of rows currently being dragged. The issue I'm seeing is that my NSString renders with a low opacity, but not my icon.

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• How to use a dynamic smarty variable in foreach loop

  - by P Kumar

  Hi, Can anyone tell me how to use dynamic variables in smarty foreach loop. I am trying to create a module in prestashop and m very close to get it done. here's my code: //file name index.php foreach($subCategories as $s) { $foo = intval($s['id_category']); $k = new Category($foo); $var1 = "subSubCategories.$foo"; $var1 = $k-getSubCategories(1); $smarty-assign(array('foo'.$foo = $var1)); } //file name:index.tpl {assign var=foo value=$foo$cat} //where $cat is a variable that counts the number of categories {if isset($foo) AND $foo} {foreach from=$foo item=subCategories name=homesubCategories} <p>{$subCategories.name}</p> {/foreach} {else} <p>{l s='test failed'}</p> {/if} I've exhausted all of my resources and knowledge and feeling quite helpless at this moment. so plz help me out.

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• How to extract data from a text file

  - by šljaker

  I need to parse some large text file and extract Display name and area code only if it matches the following pattern: Line starts with display name (any number of words) Followed by 6 digits (can contain spaces) Followed by #text tag e.g. John doe 123 456 #text some text Display name: John doe Area code: 123 456 Test 123456 #text Display name: Test Area code: 123456 Test 123 #test Invalid, area code contains only 3 digits Test 123456 #test1 Invalid, contains invalid tag Test 123g45 #test Invalid, area code contains letters etc. I know how to open the text file and read it line by line, but having trouble with writing the regular expression. Any help would be greatly appreciated! edit: I have tried this: private static void Main(string[] args) { string text = "John Doe 123 45 #text Lorem ipsum dolor :)"; string pattern = @"(\w+)*([0-9]{2,5}).([0-9]{2,5}).#text"; Match match = Regex.Match(text, pattern, RegexOptions.IgnoreCase); if (match.Success) { string key = match.Groups[0].Value; Console.WriteLine(key); } }

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• Font families on the iPhone

  - by PurplePilot

  Normally in a web app i would put a font-family in the CSS something like this " font-family: "Helvetica Neue", Arial, Helvetica, Geneva, sans-serif;" This way i cover my bases as to whether the target browser can handle the various fonts and will fail gracefully if it is missing some. However that are only a limited number of fonts on the iphone and presumably if you only specify one, say Helvetica, the iPhone will always have that font and use it. So i don't really need a font-family. Do I?

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• How to get count of another table in a left join

  - by Sinan

  I have multiple tables post id Name 1 post-name1 2 post-name2 user id username 1 user1 2 user2 post_user post_id user_id 1 1 2 1 post_comments post_id comment_id 1 1 1 2 1 3 I am using a query like this: SELECT post.id, post.title, user.id AS uid, username FROM `post` LEFT JOIN post_user ON post.id = post_user.post_id LEFT JOIN user ON user.id = post_user.user_id ORDER BY post_date DESC It works as intended. However I would like the get the number of comments for each post too. So how can i modify the this query so I can get the count of comments. Any ideas?

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• problem with the programme!!

  - by hopefulLLl

  kindly tell me what is the pblm with this function wont it help me find the sum of digits of a number?? #include<stdio.h> #include(math.h) void main() { int a,i=0,j=10,k,n=0,m; scanf("%d",&a); while((a%j!=0)&&i>=0) { m=pow(10,(i+1)); k=a%m; n=(a-(k*m)-n)/(m/10)+n; j=m*10; i++; } n=n+(n/(m/10)); printf("%d",n); } i know the parenthesis used with math.h are nt right..what else is the pblm..i need to use just while loop..or the for loop!

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• Cloud computing?

  - by Suraj

  I'm writing a report advising on future technologies that a manufacturing company could use. I've highlighted a number of advanced manufacturing technologies such as CAD etc. However, I want to bring cloud computing into the report just to score some extra points. I am not sure how one would bring together cloud computing with the advanced technologies though. Basically what would be the process of integrating these technologies into a cloud computing "environment"? Say the organisation buys a CAD package, how could they make use of cloud computing here?

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• Deciphering a queer compiler warning about unsigned decimal constant

  - by Artagnon

  This large application has a memory pool library which uses a treap internally to store nodes of memory. The treap is implemented using cpp macros, and the complete file trp.h can be found here. I get the following compiler warning when I attempt to compile the application: warning: this decimal constant is unsigned only in ISO C90 By deleting portions of the macro code and using trial-and-error, I finally found the culprit: #define trp_prio_get(a_type, a_field, a_node) \ (2654435761*(uint32_t)(uintptr_t)(a_node)) I'm not sure what that strange number is doing there, but I assume it's there for a good reason, so I just want to leave it alone. I do want to fix the warning though- any idea why the compiler's saying that it's unsigned only in ISO C90? EDIT: I'm using gcc-4.1

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• How to create updateable panel using AjaxLink of Wicket?

  - by Arne

  I try to realize a link (in fact many links) that update a table in an website using an AjaxLink of Wicket. But I fail, the table is never updated (I have "setOutputMarkupId(true)" and call "addComponent", but there must be something other thats wrong). How can I realize a panel with a number of links and a table that displays dynamic data, dependent on the link clicked? Can someone give an example (Maybe two links, when the first one is clicked the table displays two random numbers from 1-10, when the second is clicked the table displays random numbers from 1-100)? Without reloading the entire page, but only the html for the table?

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• SSH Password/User problem with Cygwin sshd service

  - by Supernovah

  hello I just set up SSHd through Cygwin on a Windows XP Pro box overseas using a RAT and discluded the openssh package from the install. I ran the cywin shell (from c:\cywin) and ran Now, It's under a port I know is safe and fowarded properly, but I won't share it's number. It's not a common port, but it's under 40000. Firewalls are off etc etc. I'm on the first Admin account made on the box. (It's full admin) I've run the following commands chmod +r /etc/passwd chmod +r /etc/group hmod 777 /var /*Created New Admin User Account To Be Used via SSH*/ mkpasswd -cl > /etc/passwd mkgroup --local > /etc/group I can connect locally, but not externally. I know my ports etc are fine. Any possible problems, as i really need this tunnel up :P

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