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• Ruby on Rails when create method fails, render loses local variables

  - by Jimmy

  Hey guys I have a simple create method with some validations and whenever the create method fails due to validation errors it re-renders the 'new' action. The problem is in my new action/view I have a local variable that is established in the action and passed to a partial to render some related information to what the user is creating. Now when my create action fails and I try to re-render the 'new' action I'm getting the always awesome undefined method `cover' for nil:NilClass error. What is the best way to handle re-establishing my action's local variables on a render instead of redirecting to the action again and the user losing the data they input?

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• changing validation group of button with javascript on client side

  - by haansi

  hi, In a form I have multiple group of controls which are grouped using validation group property. I want to assign validation group to asp.Button dynamically on client side using javascript on the base of item selected in drop down list. Here is JavaScript which I am using, but it is not working. It shows validation group undefined but actually a default group is defined. Please advice me. thanks <script type="text/JavaScript"> function NextClicked() { var _ddlStatus = document.getElementById("<%=ddl.ClientID%>"); var _selectedIndex = _ddlStatus.selectedIndex; var _btn = document.getElementById("<%=btnNext.ClientID%>"); alert(_btn.ValidationGroup); // here in messge it shows undefiend, yet I have defiend a group in button as default. if (_selectedIndex == 1) { _btn.ValidationGroup = "G1"; } else if (_selectedIndex == 2) { _btn.ValidationGroup = "G2"; } }

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• how to use variable from runscript command

  - by poe

  I get some text from a web page 5,19 € 3,50 € I want to split this text after "€". for that I'm using this command runScript|javascript{var prices = storedVars['price'].split("€"); document.write(prices[0]); document.write(prices[1])}; after done that try this command getEval|alert(storedVars['prices[0]']) the answer is that prices is undefined. what is the problem here? how can I get this variable from a runScript command? thanks for helping me!

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• Force '^C' to be printed when editing current prompt, then aborting it

  - by Stefan Lasiewski

  This is the opposite of Prevent “^C” from being printed when aborting editing current prompt. I'm using Bash. When I'm editing the commandline in Bash, and I hit Control-C to abort the commandline, the '^C' character does not display. I would like to see this character. I tried commands like stty -ctlecho and stty ctlecho (which I borrowed from the other question), but this didn't work for me. This behavior seems to be true with my environment on Ubuntu, CentOS and MacOSX.

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• Will Windows 7 setup overwrite Windows 8 and Ubuntu boot records?

  - by Jens

  I have Windows 8 and Ubuntu installed, both an the same physical hd (2 partitions). Windows 8 was installed after a format, Ubuntu afterwards. I used EasyBCD to setup the boot records and the boot menu order. I want to install Windows 7 as a third operating system and just add its boot record with EasyBCD. Will there be any unwanted behavior when I install it on a third partition? I already have 100 GB of unallocated space on the disk, though have not yet made the partition. I red on this site that I should install the oldest OS first, but than I would have to do a format and start again from scratch (which I clearly do not want to do). edit: On this site, the opposite is claimed, saying it's also possible to install Windows 7 after Windows 8. However, it will restore a Windows 7 boot menu instead one of Windows 8.

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• Is it possible to split a form into multiple erb modules?

  - by Ya.

  I have a large form with multiple tabs and would like to be able to split it into multiple modules and include each as a partial. Something like: main.html.erb: <%= form_for (@myobject) do |f| %> <%= render "module1" %> .... module1.html.erb: <%= f.text_field :field1 %> ... Needless to say, when I do it like this I get an error from module1 that "f" is undefined. Is there a way to split form fields into multiple modules?

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• Uncorrectable machine check

  - by GregC

  I am experiencing rare but real unrecoverable machine checks on HP DL370 G6 dual-core Xeon server. I ran memtest86+ before, and ran CPU-intensive operations without any problems. In your opinion, does this indicate a real problem, or is it normal and expected behavior? How would you approach this problem? EDIT after some troubleshooting, it seems that these machine checks, as well as problems when showing device manager can be traced back to NC375i NICs. All is well when the NICs are not in the server. Further improvements to stability of HP Gen6 with Intel Xeon have been brought in with BIOS update in September 2013 HP Update DVD. Intel's newer microcode makes these CPUs much more stable. We haven't seen hardware-related BSODs since the update in September.

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• fscommand2 support in Actionscript 3.0 ?

  - by Andhravaala

  Hi All, I am very new to Action Script. I am using Flash Professional CS5 with ActionScript 3.0. The problem is, When I am trying use fscommand2 function, Compiler throwing an error saying: Scene 1, Layer 'Layer 1', Frame 1, Line 7 1180: Call to a possibly undefined method fscommand2. But, I am able to use fscommand. But, it will not fulfill my requirement to get Device(Mobile) properties like DeviceID etc. Please help me in using fscommand2 or any equivalent API support in ActionScript 3.0. Thanks in advance.

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• Ruby/RoR: calling original method via super()?

  - by fearless_fool

  In a RoR app, I want to specialize ActiveRecord's update_attributes() method in one of my models, extracting some of the attributes for special handling and passing the rest of them to the original update_attributes() method. The details: class Premise < ActiveRecord::Base ... def update_attributes(attrs) attrs.each_pair do |key, val| unless has_attribute?(key) do_special_processing(key, val) attrs.delete(key) end end # use original update_attributes() to process non-special pairs super.update_attributes(attrs) end ... end The call to super.update_attributes(attr) raises an error: undefined method `update_attributes' for true:TrueClass ... which makes me suspect I really don't understand the super keyword in Ruby. What am I missing? Specifically, how do I call the original update_attributes() method?

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• How can I access this nested array within my JSON object?

  - by Charles

  I'm using PHP to return a json_encode()'d array for use in my Javascript code. It's being returned as: {"parent1[]":["child1","child2","child2"],"parent2[]":["child1"]} By using the following code, I am able to access parent2 > child1 $.getJSON('myfile.php', function(data) { for (var key in data) { alert(data[key]); } } However, this doesn't give me access to child1, child2, child, of parent1. Alerting the key by itself shows 'parent1' but when I try to alert it's contents, I get undefined. I figured it would give me an object/array? How do I access the children of parent1? data[key][0] ?

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• How do you add objects to a javascript namespace?

  - by Fletcher Moore

  var Test = (function() { return { useSub: function () { this.Sub.sayHi(); }, init: function () { $(document).ready(this.useSub); } }; })(); Test.Sub = (function () { return { sayHi: function () { alert('hi'); } }; })(); Test.useSub(); // works Test.init(); // explodes Above I am trying to create a Test namespace and add an object Sub to it. I was doing fine until I tried using the object in jQuery. The error is "Uncaught TypeError: Cannot call method 'sayHi' of undefined". If there is a better way to do this, I am open to it.

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• Client PC not booting when certain TFT plugged in - TFT or graphics card failure?

  - by Chake

  here comes something quite strange: On a client machine (DELL Vostro 420) we experienced problems when booting: when turning on the machine beeps normal but doesn't display anything and doesn't boot. After some testing I found out, that this only happens if one (of the two) monitors (Iiyama ProLite E2472HDD) is plugged in while booting. If the other monitor (TFT 2) is plugged in everything is fine. Here a small illustration, TFT 1 is the bad guy: TFT 1 | TFT 2 | failure x | x | x x | | x | x | After BIOS-Phase I can safely plug in TFT 1 and everything works just fine. The question is, what can be done to avoide this behavior: Change monitor? (Iiyama ProLite E2472HDD) Change graphics card? (GeForce 9800 GT) Other suggestions?

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• Partition falsly recognized as RAW

  - by Paul Hiemstra

  On my 2 TB data disk I have two primary partitions, one of 1.6 TB for data storage in Linux (ext3) and one of 300 GB for some additional data storage for Windows. I run a dual-boot Windows 7/Ubuntu 12.04 install. The issue I have that if I start my computer into Windows 7, bot the partitions on my 2TB data drive are not recognized. In stead, Windows 7 sees one 1TB partition with type RAW. However, if I reboot to Linux, and then back to Windows 7, the partitions are correctly recognized. The following two screenshots illustrate my situation. Before I reboot to linux: and after the reboot: I have two questions: What could cause this behavior? How can I solve this issue.

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• some verd problems in qt

  - by prabhakaran

  I am very new to qt, So whatever I facing is either errors or problems. Here goes some of them, 1)Just try to install it in VisualStudio, you will got enough for the day. 2)After you installed it as a separate qt(without embedding it inside visual studio).Open a c++ file in qt, = then you won't get any option to compile it. 3)Create a empty qt4 project like below #include<iostream> using namespace std; int main(int a,char * argv[]) { } Then build it, you will get a error like this C:\qt-greenhouse\Trolltech\Code_less_create_more\Trolltech\Code_less_create_more\Troll\4.6\qt\src\winmain/qtmain_win.cpp:131: undefined reference to `qMain(int, char**)' Can anybody clear any of these problems to me.

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• How can I safely decide if a variable is a string of more than one characters?

  - by Alan

  I am using the following Javascript: if (typeof content !== 'undefined' && content.length > 0) { $state.transitionTo('admin.content', { content: content }) } I thought this was safe to use but it gives me an error saying: TypeError: Cannot read property 'length' of null I am using the following function to decide if something is a number: isNumber: function (num) { // Return false if num is null or an empty string if (num === null || (typeof num === "string" && num.length === 0)) { return false; } var rtn = !isNaN(num) return rtn; }, How can I write a similar function that would very safely determine if something is a string with a length of more than 0?

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• Virtualbox, slow upload speed using nat

  - by user1622094

  Im running Virtualbox on a Ubuntu 12.04 server (host) and I'm running a Windows 7 as guest os. Im using the (virtual) Intel PRO/1000 MT network card. I get good network performance for download using both nat and bridged network settings but upload speed is really slow using nat. I have tied this on tow different servers, one brand new, and one a several years old, both gave the same result. If you can explain this behavior or have ideas of further test I can perform please let me know.

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• How to link Cocoa static library to C command line target?

  - by Devara Gudda

  I have static library target, which uses Foundation classes(NSArray,etc) . I want to use this static library in Command line tool target. The command line tool contains only C files. From command line tool I want to call a method exported in static library. So I have modified header search path and linked the static library. When I compile the command line tool it is following linker errors. Undefined symbols: "_OBJC_CLASS_$_NSMutableArray", referenced from: "_objc_msgSend", referenced from: What is the method to link a static library which uses Foundation classes from a command line tool which contains C files? Regards Devara Gudda

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• Rails form helpers: how to add an element to a collection?

  - by Laran Evans

  I have a keychain object. keychain has_many credentials. I'm trying to write the view code to add a new credential to a keychain. This is the code I have: <% form_for(@keychain) do |f| % <tr <td<%= f.select "credentials[]", current_account.services.collect{ |s| [s.friendly_name, s.id] } %</td <td<%= f.text_field 'credentials', :username %</td <td<%= f.password_field 'credentials', :password %</td </tr <% end % But it fails with this message: NoMethodError in Keychains#new Showing app/views/keychains/_keychain_form.html.erb where line #32 raised: undefined method `credentials[]' for # What am I doing wrong?

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• How can I see if apache is overloaded and dropping or not accepting connections?

  - by cat pants

  Basically I just want to see if apache is handling a current level of high traffic or if I need to tune it to handle more connections. (I have found plenty of information on the actual tuning, so no help needed there) I know it has been dropping or not accepting connections earlier today, but not seeing anything in the error logs. Is the expected behavior to throw a 503 in the error log if apache cannot accept more connections? If so, what error logging level do I need in order to see these? What is the correct terminology: dropping connections or not accepting connections? MPM is prefork, OS is Linux, apache version is 2.2.15.

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• Nagios and rrd on a old server

  - by Pier

  I have an old server (P4 based) on which nagios (and all the other tools to monitor) is running. In the last few weeks we are seeing a strange behavior. In the /var/spool/pnp4nagios (where temporary files are stored before getting processed by pnp4nagios daemon) we have many files like perfdata.1274949941-PID-18839 and we get an error in npcd.log: [05-27-2010 11:17:46] NPCD: ThreadCounter 0/15 File is perfdata.1274951306-PID-27849 [05-27-2010 11:17:46] NPCD: File 'perfdata.1274951306-PID-27849' is an already in process PNP file. Leaving it untouched. Sometimes some graph are not drawn. The server is pretty loaded (around 5-6 normally) and i suspect that npcd goes in timeout and leave those files behind. What could I do (apart from change the server)? Few infos about the system: centos 5.5 nagios 3.2.1 pnp4nagios 0.6 (from sources) Thanks

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• Angular function constructor in Controller

  - by BigHeadCreations

  In normal JS I can do this: function Droppable() { this.relevant = true; this.uuid = generateUUID(); }; var generateUUID = function() { return '12345'; } console.log(new Droppable); // returns Droppable {relevant: true, uuid: "12345"} But in Angular I have this: angular.module('myApp').controller('MyCtrl', ['$scope', function($scope) { function Droppable() { this.relevant = true; this.uuid = generateUUID(); } var generateUUID = function() { return '12345'; } // initalize droppable areas $scope.region1 = [new Droppable]; $scope.region2 = [new Droppable]; $scope.region3 = [new Droppable]; }]); I am trying to make 3 droppable areas all with a UUID. But when I do this I get 'undefined is not a function' referring to the line this.uuid = generateUUID(); in function Droppable() {...} Why is that?

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• Starting out with vote_fu

  - by zizee

  Hi All, Trying my luck with the vote_fu rails plugin. The functionality looks like exactly what I need for a project of mine, but I have hit a roadblock. I have followed the github readme to the letter, installing it as a plugin. I have put acts_as_voteable on my "Event" model and acts_as_voter on my User model. In the console, when I try: >> event.votes or >> user.votes it successfully returns an empty array. but when I try to do the following: user.vote_for(event) I get "NoMethodError: undefined method `user_id' for #<Vote:0x7f5ed4355540>" Any ideas? I'm probably just missing something obvious, but maybe something is missing from the plugin's readme. Thanks.

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• Passing value from :locals to link_remote_to

  - by Teef L

  In my edit.haml file, I have =render :partial => 'old_question_tags', :locals => {:current_question => @question.id}. I'd like to pass the value in :current_question to a link_to_remote call in _old_question_tags.haml: #{link_to_remote image_tag('red-x.png', {:alt => "Remove #{t.name} tag"}), :url => {:action => 'remove_old_tag_from_question', :tag_remove => t.id, :current_question => current_question}} But I get this error on the link_to_remote line: ActionView::TemplateError (undefined local variable or method `current_question' for #<ActionView::Base:0xdb2fec8>) In _old_question_tags.haml, if I just print current_question (using =current_question), it prints the number without any problems. How do I properly pass that value to the partial so that I can pass it to the link_to_remote call?

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• Selection Issues with a PDF from a Word document

  - by syrion

  I have a long Word document that has a running footer. When I try to copy and paste across pages in the PDF generated from this document, the behavior of this footer is unpredictable--sometimes it is unselected, sometimes it is selected, sometimes the footer on the next page is selected. I would prefer to make this portion of the document unselectable, so that it still shows up but doesn't interfere with copying and pasting. Does anyone have an idea of how to do this? No, changing it to an image isn't possible, because it includes a page number.

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• Chrome/Webkit audio tag bug?

  - by Ronald

  I'm trying to get HTML5's audio tag to work in Chrome. The following code works flawlessly in Firefox, any ideas why it isn't working in Webkit? <html> <head> <script type="text/javascript"> function init(){ audio = new Audio("chat.ogg"); audio.play(); } </script> </head> <body onload="init()"> </body> I should also note that I tried this with an mp3 as well. Regardless of what format, whenever .play() is called on audio, Chrome responds with "undefined".

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