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  • Why is it supposedly "hard" to deploy Ruby on Rails to production?

    - by johnny
    I admit that I don't follow much of anything "right" on deploying test versus production code. I have been using ASP.NET, and I typically run it locally in Visual Studio, it works, I upload it, I test it again on the production server. I have read several people say that deploying Rails apps is harder and there are special programs/ways on the ruby site about deploying RoR. I've only toyed with RoR. What is special about deployment? You don't just copy and paste the code and run it (from development machine to the production)? Is it because one is in Apache and the other running on the built in server? This will be on a Mac Server if it matters. Thank you for comments.

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  • Why is YAML installing to my home directory instead of its proper directory?

    - by Zack Shapiro
    I keep getting the following error when installing Ruby 1.9.3-p125: It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby. I've tried installing LibYAML and for some reason it's installing in my home directory on OS X Lion where the Documents, Music, Pictures, etc. folders are. Any idea how I can get rid of this error, properly install YAML and never have to deal with this again?

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  • Why IE7 is not respecting the z-index order?

    - by janoChen
    The #cm_sidebarDIV div has z-index 3; The .abouttop and .aboutlist divs have z-index 2 So #cm_sidebarDiv is at the top when it is displayed in Firefox and Chrome but in EI7 it remains at the bottom. #leftmanulist{ background:url("images/abouttop.gif") no-repeat; float: left; margin: 2px 2px 5px 30px; padding:39px 0 0 0; width:237px; } #leftmanulist ul li{line-height:35px;text-align:left; text-decoration:none;} #leftmanulist ul li a{ text-decoration:none;} #leftmanulist ul li:hover{ color:#0068FF;} #leftmanulist ul li a:hover{ color:#0068FF;} #leftmanulist ul li.index{ color:#0068FF;} #leftmanulist ul li.index a{ color:#0068FF;} .abouttop{background:url("images/leftmanulist_z.gif") repeat-y ; padding:0 6px; position:relative; z-index:2; width:237px;} .aboutlist{position:relative;left:28px;} .aboutbutton{background:url("images/leftmanulist_b.gif") no-repeat; width:237px; height:20px; position:relative; top:-17px; z-index:2;} .inword{color:#555555;font-size:0.92em;text-align:justify;line-height:24px;letter-spacing:1px; padding:30px 40px 0px 336px; } #cm_sidebarDIV { z-index: 3; } Any suggestions?

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  • Why does a C# System.Decimal remember trailing zeros?

    - by Rob Davey
    Is there a reason that a C# System.Decimal remembers the number of trailing zeros it was entered with? See the following example: public void DoSomething() { decimal dec1 = 0.5M; decimal dec2 = 0.50M; Console.WriteLine(dec1); //Output: 0.5 Console.WriteLine(dec2); //Output: 0.50 Console.WriteLine(dec1 == dec2); //Output: True } The decimals are classed as equal, yet dec2 remembers that it was entered with an additional zero. What is the reason/purpose for this?

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  • Why would the IE Developer Toolbar claim a style is applied, yet that supposed fact is not reflected

    - by Deane
    I have a situation where IE7 is simply not applying styles, even though it claims it is. I have an element on my page. In the CSS, I have defined a rule that should apply "display: none" to it, so it should not be displayed. It's still displaying. I downloaded the IE Developer Toolbar, and found the element in the DOM selector. I right-clicked and selected "Applied Styles." Right there, IE claims that it is applying my "display: none" rule. In fact, the "Applied Styles" dialog confirms everything I think I know about my CSS and how it should be applied. Yet the element remains. Now, I'm not asking anyone to debug my CSS here. I'm asking, if the IE Developer Toolbar claims/confirms this element should be gone, but it's still there...what does that mean, exactly? Since the Toolbar is on my side, I think my CSS is fine. Is there some IE7 bug I'm not considering? Edit: One thing that might be relevant: the LINK elements that load the stylesheets are applied to the page in Javascript, via "document.write". I'm starting to suspect that has something to do with it.

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  • Why isn't my Ruby object deleted when the last reference goes out of scope?

    - by Andrew Clegg
    Hi gurus, I've found a weird effect when trying to track down a memory leak in a Rails app. Can anyone explain what's going on here? Save this script as a plain Ruby script (Rails not necessary): class Fnord def to_s 'fnord' end end def test f = Fnord.new end test GC.start sleep 2 ObjectSpace.each_object do |o| puts o if o.is_a? Fnord end When I run this via ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux] I get the following: bash $ ruby var_test fnord Although the variable f is out of scope, there are no other references to the single Fnord object, and I've garbage collected, the object still seems to exist. Is this a nefarious memory leak of some sort, or am I completely missing something about Ruby? Further, if I change the test method to this: def test f = Fnord.new f = nil end I get no output. But surely this should not change the semantics here? Many thanks!

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  • Why does jQuery fadeOut not work inside this setInterval loop?

    - by Clay McClure
    I'm trying to load random items into a div every few seconds, with a nice fadeOut/fadeIn transition between each load. Here's the code: <html> <body> <div id="item"></div> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script type="text/javascript"> // Load a random item var item = $('#item'); function load_item() { item.fadeOut(5000, function() { item.load('http://dynamic.xkcd.com/comic/random/ #middleContent img', null, function() { item.fadeIn(5000); }); }); }; // Load initial featured item load_item(); // Schedule repeated loading setInterval(load_item, 15000); </script> </body> </html> This works fine the first time through, but on subsequent calls to load_item, the fadeOut() seems to stop working. It doesn't actually fade the #item div out, but jumps immediately into the callback function, ignoring the 5000 delay. What am I doing wrong?

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  • Why am I getting "too many include files : depth = 1024"?

    - by BeeBand
    I'm using Visual Studio 2008 Express edition, and keep getting the following error: "Cascadedisplay.h(4) : fatal error C1014: too many include files : depth = 1024. Obviously I'm doing something very wrong with include files, but I just can't see what. Basically, I have an interface class, StackDisplay, from which I want to derive CascadeDisplay in another file: #if !defined __BASE_STACK_DISPLAY_H__ #define __BASE_STACK_DISPAY_H__ #include <boost\shared_ptr.hpp> #include "CascadeDisplay.h" namespace Sol { class StackDisplay { public: virtual ~StackDisplay(); static boost::shared_ptr<StackDisplay> make_cascade_display(boost::shared_ptr<int> csptr) { return boost::shared_ptr<StackDisplay>(new CascadeDisplay(csptr)); } }; } #endif and then in CascadeDisplay.h: #if !defined __CASCADE_DISPLAY_H__ #define __CASCADE_DISPAY_H__ #include "StackDisplay.h" #include <boost\shared_ptr.hpp> namespace Sol { class CascadeDisplay: public StackDisplay { public: CascadeDisplay(boost::shared_ptr<int> csptr){}; }; } #endif So what's up with that?

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  • Can there be two public section in a class? If yes then why ? And in which circumstances we do so?

    - by Abhi
    Dear all I have a doubt related to class. For example class A { public: A() { ..... ..... } void cleanup() { .... .... .... } public: UINT a; ULONG b; }; In the above example there are two public section, In first section i am defining constructor and the method and in the second section i am declaring data members. Does the above class i.e. A is correct. Can we do so? If yes then why we needed and in which circumstances we should use it? Also we can do the entire thing in one section then why un necessary we r taking two section...? Thanks and regards Abhineet Agarwal

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  • GetAcceptExSockaddrs returns garbage! Does anyone know why?

    - by David
    Hello, I'm trying to write a quick/dirty echoserver in Delphi, but I notice that GetAcceptExSockaddrs seems to be writing to only the first 4 bytes of the structure I pass it. USES SysUtils; TYPE BOOL = LongBool; DWORD = Cardinal; LPDWORD = ^DWORD; short = SmallInt; ushort = Word; uint16 = Word; uint = Cardinal; ulong = Cardinal; SOCKET = uint; PVOID = Pointer; _HANDLE = DWORD; _in_addr = packed record s_addr : ulong; end; _sockaddr_in = packed record sin_family : short; sin_port : uint16; sin_addr : _in_addr; sin_zero : array[0..7] of Char; end; P_sockaddr_in = ^_sockaddr_in; _Overlapped = packed record Internal : Int64; Offset : Int64; hEvent : _HANDLE; end; LP_Overlapped = ^_Overlapped; IMPORTS function _AcceptEx (sListenSocket, sAcceptSocket : SOCKET; lpOutputBuffer : PVOID; dwReceiveDataLength, dwLocalAddressLength, dwRemoteAddressLength : DWORD; lpdwBytesReceived : LPDWORD; lpOverlapped : LP_OVERLAPPED) : BOOL; stdcall; external MSWinsock name 'AcceptEx'; procedure _GetAcceptExSockaddrs (lpOutputBuffer : PVOID; dwReceiveDataLength, dwLocalAddressLength, dwRemoteAddressLength : DWORD; LocalSockaddr : P_Sockaddr_in; LocalSockaddrLength : LPINT; RemoteSockaddr : P_Sockaddr_in; RemoteSockaddrLength : LPINT); stdcall; external MSWinsock name 'GetAcceptExSockaddrs'; CONST BufDataSize = 8192; BufAddrSize = SizeOf (_sockaddr_in) + 16; VAR ListenSock, AcceptSock : SOCKET; Addr, LocalAddr, RemoteAddr : _sockaddr_in; LocalAddrSize, RemoteAddrSize : INT; Buf : array[1..BufDataSize + BufAddrSize * 2] of Byte; BytesReceived : DWORD; Ov : _Overlapped; BEGIN //WSAStartup, create listen socket, bind to port 1066 on any interface, listen //Create event for overlapped (autoreset, initally not signalled) //Create accept socket if _AcceptEx (ListenSock, AcceptSock, @Buf, BufDataSize, BufAddrSize, BufAddrSize, @BytesReceived, @Ov) then WinCheck ('SetEvent', _SetEvent (Ov.hEvent)) else if GetLastError <> ERROR_IO_PENDING then WinCheck ('AcceptEx', GetLastError); {do WaitForMultipleObjects} _GetAcceptExSockaddrs (@Buf, BufDataSize, BufAddrSize, BufAddrSize, @LocalAddr, @LocalAddrSize, @RemoteAddr, @RemoteAddrSize); So if I run this, connect to it with Telnet (on same computer, connecting to localhost) and then type a key, WaitForMultipleObjects will unblock and GetAcceptExSockaddrs will run. But the result is garbage! RemoteAddr.sin_family = -13894 RemoteAddr.sin_port = 64 and the rest is zeroes. What gives? Thanks in advance!

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  • Any reason why NGEN should hang and never complete for a particular assembly?

    - by Lasse V. Karlsen
    I have a class library project for .NET 3.5 built with Visual Studio 2008. If I try to NGEN the core assembly in this solution file, NGEN never completes, or at least not in the time I've bothered to let it run (like overnight). Has anyone else experienced this? And if so, did you solve it? And if you did, how? What steps did you take? If this is a bug in NGEN, how do I post this to Microsoft? I have a connect account, but where do I post a bug-report for this particular product, instead of a .NET class (which I know where to go for.) The class library in question can be found here: http://svn.vkarlsen.no:81/svn/LVK/LVK_3_5/trunk (subversion 1.6 repository) The problematic assembly is the LVK.Core assembly.

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  • why does Visual Studio not enforce try-catch-block implementation?

    - by Pedro
    Coming from Eclipse/Java, I noticed that in VisualStudio/C# it is not mandatory to care about Exceptions. While Eclipse forces the user to implement a try-catch-block or to add a throws declaration, this is not the case in Visual Studio. What is the reason Visual Studio doesn't inform about unhandled exceptions? Can I configure Visual Studio to force me to implement try-catch-blocks, or at least add a compiler-warning?

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  • Why is there a sizeof... operator in C++0x?

    - by Motti
    I saw that @GMan implemented a version of sizeof... for variadic templates which (as far as I can tell) is equivalent to the built in sizeof.... Doesn't this go against the design principle of not adding anything to the core language if it can be implemented as a library function[citation needed]?

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  • Why can't the style I have within a control template use templatebinding?

    - by Justin
    I have this control template that I am writing: <Style TargetType="{x:Type controls:InfoBar}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type controls:InfoBar}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <StackPanel> <Grid> <Grid.Resources> <Style TargetType="{x:Type TextBlock}"> <Setter Property="FontFamily" Value="{TemplateBinding FontFamily}" /> <Setter Property="FontSize" Value="{TemplateBinding FontSize}" /> <Setter Property="Foreground" Value="{TemplateBinding Foreground}" /> </Style> </Grid.Resources> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <ItemsControl Grid.Column="0" ItemsSource="{TemplateBinding LeftInfoBarTextBlockCollection}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <WrapPanel /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> <ItemsControl Grid.Column="1" ItemsSource="{TemplateBinding MiddleInfoBarTextBlockCollection}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <WrapPanel /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> <ItemsControl Grid.Column="2" ItemsSource="{TemplateBinding RightInfoBarTextBlockCollection}"> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <WrapPanel /> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> </Grid> </StackPanel> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style> This section of xaml is throwing member is not valid because it does not contain a valid type name. exceptions for the template bindings on FontFamily, FontSize and Foreground. <Grid.Resources> If I change it to this: <Grid.Resources> It will build, but when I debug it, I get this XmlParseExeption: Set property 'System.Windows.Setter.Value' threw an exception. If I change controls:InfoBar to Control, which InfoBar inherits from, I get the same exception. What am I doing wrong?

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  • Why do Facebook followers not shown in Safari & IE8?

    - by Vaibhav Bhalke
    Hello Everybody We integrated facebook in our web application [Java GWT]. Facebook page followers shown in Mozila firefox 3.07 and Google :) but not shown in Safari and IE8 :( we used following script in our Java coding to show facebook page followers[Like]: <script type='text/javascript' src='http://static.ak.connect.facebook.com/js/api_lib/v0.4/FeatureLoader.js.php/en_US'></script> <script type='text/javascript'> FB.init('MY_APP_ID');</script> <fb:fan profile_id=\"MY_PAGE_ID\" stream=\"0\" connections=\"10\" logobar=\"0\" width=\"244\" height=\"240\" css='http://127.0.0.1/myWebApplicationName/facebook.css?1'></fb:fan> What's the problem? What changes will need to fb page followers in all browser? Is there any solution to Show facebook page followers to All browser? Thank you in Adavance !!!

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  • Why does Python array moduel handle strings and lists differently?

    - by Casey
    I'm having trouble understanding the result of the following statements: >>> from array import array >>> array('L',[0xff,0xff,0xff,0xff]) array('L', [255L, 255L, 255L, 255L]) >>> from array import array >>> array('L','\xff\xff\xff\xff') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: string length not a multiple of item size

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  • Dropdown in Access 2007 parameter query. Why not working

    - by waanders
    Hello, I want a Access parameter query to ask an user for a value (a location in this case). When I type [Enter location] in the Criteria field it works fine: I get a dialog box (Enter Parameter Value) with a textbox and my text (Enter Location). So far, so good. This works (the result also). But now I want a dropdown/combobox (instead of a textbox ) for the user to pick a location. I made a form and type Forms![Form1]![CmbLocation] in the Criteria field. Like this: http://office.microsoft.com/en-us/access/HA011170771033.aspx But I still get a textbox (with the reference as textlabel). What am I doing wrong? Has anybody any advice?

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  • Why does grails use hsqldb when I ask for mysql?

    - by John
    I'm following the racetrack example from Jason Rudolph's book at InfoQ, using grails-1.2.1. I got up to the part where I was to switch from hsqldb to mysql. I think I've deleted every reference to hsqldb in the DataSource.groovy file, but I get an exception and the stack trace shows it's still using hsqldb. DataSource.groovy dataSource { boolean pooled = true String driverClassName = "com.mysql.jdbc.Driver" String url = "jdbc:mysql://localhost/dfpc2" String dbCreate = "create" String username = "dfpc2" String password = "dfpc2" dialect = org.hibernate.dialect.MySQL5InnoDBDialect } hibernate { cache.use_second_level_cache=true cache.use_query_cache=true cache.provider_class='net.sf.ehcache.hibernate.EhCacheProvider' } // environment specific settings environments { development { } test { } production { } } When I grails run-app it all starts up with no errors. I can navigate to the home page. But when I click on one of the links, I get a stack trace: java.sql.SQLException: Table not found in statement [select this_.id as id0_0_, this_.version as version0_0_, this_.name as name0_0_, this_.variant as variant0_0_ from domainObject this_ limit ?] at org.hsqldb.jdbc.Util.throwError(Unknown Source) at org.hsqldb.jdbc.jdbcPreparedStatement.<init>(Unknown Source) at org.hsqldb.jdbc.jdbcConnection.prepareStatement(Unknown Source) at dfpc2.domainObjectController$_closure2.doCall(script1269434425504953491149.groovy:13) at dfpc2.domainObjectController$_closure2.doCall(script1269434425504953491149.groovy) at java.lang.Thread.run(Thread.java:619) My mysql database shows no tables created. (I don't think groovy's connected to mysql yet.) Things I've checked: mysql-connector-java-5.1.6.jar is in lib directory. I've tried grails clean I tried putting the dataSource info in the development environment (I haven't graduated to test or prod yet), but it seemed to make no difference. The stdout shows I'm using development env. I've googled for solutions, but the only solution I've found is when people don't change the test or production environments.

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  • CInternetSession::OpenURL exception if headers are defined. Works fine if not. Why?

    - by Jesse
    Trying to log the application version details in our weblogs using the headers: Should be a one liner..but for some reason whenever I specify anything but NULL for the headers it causes an exception (InternetOpenUrl() call returns NULL) - anyone able to explain why? CInternetSession internet; CHttpFile * pHttpFile; CString headers;// = APPLICATION_SUITE_NAME; DWORD dwHeadersLength = -1; headers.Format("%s %s %s\n",APPLICATION_SUITE_NAME,SHORT_APPLICATION_VERSION,BUILDNO_STR); pHttpFile =(CHttpFile *) internet.OpenURL(lpszURL, 1, INTERNET_FLAG_TRANSFER_ASCII|INTERNET_FLAG_DONT_CACHE, headers, dwHeadersLength); Without the headers, dwHeadersLength parameter (eg. pass in NULL,-1) then it goes through fine and I see the request come through to our website. But why does it fail if I pass in custom headers?

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