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• Paperclip: delete attachments and "can't convert nil into String" error

  - by snitko

  I'm using Paperclip and here's what I do in the model to delete attachments: def before_save self.avatar = nil if @delete_avatar == 1.to_s end Works fine unless @delete_avatar flag is set when the user is actually uploading the image (so the model receives both params[:user][:avatar] and params[:user][:delete_avatar]. This results in the following error: TypeError: can't convert nil into String from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:40:in `dirname' from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:40:in `flush_writes' from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:38:in `each' from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/storage.rb:38:in `flush_writes' from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/attachment.rb:144:in `save' from /Work/project/src/vendor/plugins/paperclip/lib/paperclip/attachment.rb:162:in `destroy' from /Work/project/src/app/models/user.rb:72:in `before_save' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:347:in `send' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:347:in `callback' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/callbacks.rb:249:in `create_or_update' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2538:in `save_without_validation' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/validations.rb:1078:in `save_without_dirty' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/dirty.rb:79:in `save_without_transactions' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:229:in `send' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:229:in `with_transaction_returning_status' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/database_statements.rb:136:in `transaction' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:182:in `transaction' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:228:in `with_transaction_returning_status' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:196:in `save' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:208:in `rollback_active_record_state!' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/transactions.rb:196:in `save' from /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:723:in `create' I assume it has something to do with the avatar.dirty? value because when it certainly is true when this happens. The question is, how do I totally reset the thing if there are changes to be saved and abort avatar upload when the flag is set?

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• HttpSession problem in Google App Engine/J

  - by Tahir Akram

  I am writting a Twitter web app by using Twitter4J on GAE/J. I am saving Twitter and Request Token objects in session so that to be used after call back. I have two servlets. IndexServlet sets session and HomeServlet get from session (hits on call back by twitter oAuth). If I comment out session handling lines in both servlets then call backs works fine. Please suggest any workaround. I am sharing my code here. IndexServlet.java Twitter twitter = new Twitter(); twitter.setOAuthConsumer("<masked>", "<masked>"); RequestToken requestToken = null; try { requestToken = twitter.getOAuthRequestToken(); log.info("OAuth token has been taken"); } catch (TwitterException e) { log.warning(e.toString()); } HttpSession session = request.getSession(); if (session.getAttribute("twitter")==null){ session.setAttribute("twitter", twitter); out.println("-----------------------------> session is set"); } if (session.getAttribute("token")==null){ session.setAttribute("token", requestToken); out.println("-----------------------------> session is set"); } String authUrl = requestToken.getAuthorizationURL(); HomeServlet.java HttpSession session = request.getSession(); twitter = (Twitter)session.getAttribute("twitter"); r = (RequestToken)session.getAttribute("token"); twitter.setOAuthAccessToken(r.getAccessToken()); twitter.updateStatus("Hello World!"); Exception javax.servlet.ServletException: java.lang.ArrayStoreException: [Ljava.lang.String; at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:239) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139) at org.mortbay.jetty.Server.handle(Server.java:313) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506) at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:139) at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java:235) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4950) at com.google.apphosting.base.RuntimePb$EvaluationRuntime$6.handleBlockingRequest(RuntimePb.java:4948) at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java:24) at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java:359) at com.google.net.rpc.impl.Server$2.run(Server.java:823) at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java:56)

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• Converting to and from Unicode in PHP

  - by Chris

  Hey, I'm using php 5 and need to communicate with another server that runs completely in unicode. I need to convert every string to unicode before sending it over. This seems like an easy task, but I haven't been able to find a way to do it yet. Is there a simple function that returns a unicode string? i.e. convert_to_unicode("the string i'm sending")

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• Anchor Window to Screen Edges in C#/WPF

  - by Kirk

  I've decided to teach myself C# by writing a music player in Visual Studio 2010. I went with WPF because from what I hear it sounds like it will be a good base to skin from. I want to program my window with the behavior where if the window comes to the edge of a screen (within 10px or so) it will snap to the screen edge. What's the best way to go about this?

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• Have minimized windows with a unique icon/color?

  - by JB

  Are there any programs or way to get a specific icon or any icon for that matter into a minimized window? The reason why I ask is that I hate having 3 or more windows of the same program minimized on my taskbar using the same icon. When I want to open up the program i'm not sure which window to activate. -edit I'm asking for a program to do this for me, not a programming technique

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• unit, integration and system tests for PHP applications

  - by Sara

  Hi, We were given an assignment to develop a prototype for a customer community. It was suggested PHP as the programming language. (but we're not supposed to actually code it, just a prototype with documentation is required) I'm wondering what are the best practices/ tools used in Unit testing, Integration Testing and System testing for such a php app Thanks

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• Mysql : Count Posts and Group by date

  - by Oguz

  Hello , I am not very good at sql , generally I use php to do my complicated tasks , But in this task , there are lots of data , so using php for counting posts is very slow. So I want a sql which counts post by date , but my date column in table is php's time stamp.I will crate post number x date chart

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• Java MouseListener

  - by ikurtz

  I have a bunch of JLabels and i would like to trap mouse click events. at the moment i am having to use: public void mouseClicked(MouseEvent arg0) { } public void mouseExited(MouseEvent arg0) { } public void mouseEntered(MouseEvent arg0) { } public void mousePressed(MouseEvent arg0) { } public void mouseReleased(MouseEvent arg0) { System.out.println("Welcome to Java Programming!"); } I was wondering if there is a tidier way of doing this instead of having a bunch of events I do not wish trap?

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• MFS Agile Process Template Work Items

  - by devdept

  Where can I find a practical example on how to use Bug, Risk, Scenario, Task and Quality of Service Requirement work items? On MSDN documentation I found this topic: http://msdn.microsoft.com/en-us/library/bb668962.aspx but it is not enough for me to deeply understand when to use one or the other. Thanks!

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• Loading Hybrid Dimension Table with SCD1 and SCD2 attributes + SSIS

  - by Nev_Rahd

  Hello I am just in a process of starting a new task, wherein in i need to load Hybrid Dimension Table with SCD1 and SCD2. This need to be achieved as a SSIS Package. Can someone guide what would be the best way dealing this in SSIS, should i used SCD component or there is other way? What are the best practices for this. For SCD2 type, am using Merge statement. Thanks

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• Twisted: why is it that passing a deferred callback to a deferred thread makes the thread blocking a

  - by surtyaarthoughts

  I unsuccessfully tried using txredis (the non blocking twisted api for redis) for a persisting message queue I'm trying to set up with a scrapy project I am working on. I found that although the client was not blocking, it became much slower than it could have been because what should have been one event in the reactor loop was split up into thousands of steps. So instead, I tried making use of redis-py (the regular blocking twisted api) and wrapping the call in a deferred thread. It works great, however I want to perform an inner deferred when I make a call to redis as I would like to set up connection pooling in attempts to speed things up further. Below is my interpretation of some sample code taken from the twisted docs for a deferred thread to illustrate my use case: #!/usr/bin/env python from twisted.internet import reactor,threads from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(): print 'doing lookup... this may take a while' time.sleep(10) return 'results from redis' def result(res): print res def main(): lc = LoopingCall(main_loop) lc.start(2) d = threads.deferToThread(aBlockingRedisCall) d.addCallback(result) reactor.run() if __name__=='__main__': main() And here is my alteration for connection pooling that makes the code in the deferred thread blocking : #!/usr/bin/env python from twisted.internet import reactor,defer from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(x): if x<5: #all connections are busy, try later print '%s is less than 5, get a redis client later' % x x+=1 d = defer.Deferred() d.addCallback(aBlockingRedisCall) reactor.callLater(1.0,d.callback,x) return d else: print 'got a redis client; doing lookup.. this may take a while' time.sleep(10) # this is now blocking.. any ideas? d = defer.Deferred() d.addCallback(gotFinalResult) d.callback(x) return d def gotFinalResult(x): return 'final result is %s' % x def result(res): print res def aBlockingMethod(): print 'going to sleep...' time.sleep(10) print 'woke up' def main(): lc = LoopingCall(main_loop) lc.start(2) d = defer.Deferred() d.addCallback(aBlockingRedisCall) d.addCallback(result) reactor.callInThread(d.callback, 1) reactor.run() if __name__=='__main__': main() So my question is, does anyone know why my alteration causes the deferred thread to be blocking and/or can anyone suggest a better solution?

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• upload file with FTP using nant

  - by Or A

  hi, i have a nant script that i use to build my .net project and i'm looking to see if there is a way to upload the resulted assemblies to some remote folder using an FTP task of nant. i couldn't find any good example online, and i'm wonder if anyone know how to do it, if its doable at all. FYI: i'm running it on a windows machine, if it makes any difference. Thanks, Ori

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• Difference Between Property And Function.

  - by Asim Sajjad

  Which one is better to use when it come to return value for example public int EmployeeAge { get{return intEmployeeAge}; } And public int EmployeeAge() { return intEmployeeAge; } Which one is better and why? And what is best programming practice to use when we have secnario like above ?

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• Leaening Quartz and/or openGl for iPhone resources?

  - by Moshe

  I am interested in learning how to program game graphics for iPhone OS (3.x and beyond...). Can anyone recommend (based on personal experience) good books/websites that deal specifically with Quartz/OpenGL ES programming. Thanks.

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• Finding a certain cell in gridview through the use of column and row

  - by newName

  I have a populated gridview that consist of template fields. I would like to find/check a certain number of cells using values of rows and columns. Eg: |Time|col1|col2|col3|col4|col5| |1200|------|-----|-----|------|-----| |1300|------| -X- |-----|------|-----| |1400|------|-----|-----|------|-----| lets say i have the value "1300" for the row and the column header text "col2", I would like to find the cell marked "X" and check for some condition and change the text if necessary (col1 - col5 are template fields made up of labels and buttons, so therefore base on certain conditions i would like to show/hide the labels/buttons or change the text for the labels) Thanks

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• Rake uninitialized constant RDoc::RDoc

  - by Joshua

  When ever I run make I get this 'uninitialized constant RDoc::RDoc' error rake -T (in Main) rake aborted! uninitialized constant RDoc::RDoc C:/Ruby186/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2383:in `raw_load_rakefile' (See full trace by running task with --trace) --edit Running --trace it seems the only non rails code is from rdoc_rails. Since other people seem to be able to run it fine I assume I am missing a gem or plugin but I can't figure out which.

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• How to extend the Eclipse Java Editor to add coloured overlays

  - by Gavin Clarke

  I have an idea for an Eclipse plugin which I've been toying with. I need to be able to extend the Eclipse Java Editor component and add coloured overlays to the code based on pluggable external metrics. Unfortunately there doesn't appear to be any kind of syntax highlighting extension point. Does anyone know how I might be able to extend the exisitng eclipse Java Editor to add custom highlighting rules? Bear in mind I'm new to Eclipse plugin programming so please give as much detail as possible.

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• Opening a huge .csv file with Excel Interop using C#

  - by user262102

  Hi, I have an application that write huge .csv files about the size ranging from 1 GB to 2 GB. I need to color code the file and save it as .xlsx. So I have tried using Excel Interop and it works great for small files, but when I try to open a 1.3 GB .csv file with Excel, I get an Hresult error. Any ideas as to how I could accomplish this task either with using Excel, or if there is any other way of doing it. Thanks!

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• Best Way to Include Debug Code?

  - by stormin986

  I am programming Android applications, and the best way here may or may not be the same as Java in general. I simply want to be able to set a debug flag that will only execute certain portions of code when it's set to true––equiv to C++ setting a preprocessor #define DEBUG and using #ifdef DEBUG. Is there an accepted or best way to accomplish this in Java? Right now I'm just going to set a variable in my Application object, but I don't imagine this is the best way.

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• Visual Studio 2010 Premium is giving me a "Cannot Create Window" error!

  - by Sergio Tapia

  When I first launched the Visual Studio (I just installed it) I choose the default programming layout (Visual C#/Visual Basic.NET/ F#/etc) as Web Development. It gave some error that it couldn't find the layout scheme or something and now it says Cannot Open Window. Is there some way to reset the selected layout option?

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• Is there a future for Powerpoint VBA/VSTO?

  - by Sam Russo

  Does anyone know what the future holds for VBA/VSTO programming in Powerpoint? I've been working on a Office automation project and find it frustrating to work with Powerpoint in particular since it seems to be one level below VBA support found in Excel or Word. It feels like MS is trying to phase out support for VBA in PPT since they dropped macro recording in version 2007 and the object model lacks some key features support.

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• Is this not downcasting?

  - by cambr

  If I do double d = 34.56; int i = (int)d; Am I not "downcasting"? OR Is this term only used in terms of classes and objects? I am confused because in this case we are "downcasting" from a bigger double to a smaller int, but in case of classes, we "downcast" from a smaller base class to a bigger derived class. Aren't these two conventions, in some sense, opposite?

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• Framework/tools for rapid development of niche social networking site?

  - by greenday90

  What kind of framework/tools do you guys have experience with that are useful for rapid development with limited resources of a niche social network that doesn't have to scale too much? Preferably in PHP base.

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• Book/tutorial that teaches how to make programs that are easy to maintain and are less coupled?

  - by grokker

  Hi, I'm a PHP programmer and I really want to increase the quality of my code and most importantly I want to be better at programming. What book, tutorial or article would you guys suggest that I read that teaches how to make programs that are less coupled and easy to maintain? Are there any specific tips for PHP especially for the CakePHP framework? Thanks in advance!

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• What happens with TCP packets between 2 Socket.BeginReceive Call??

  - by Rodrigo

  Hi, i have a doubt about Socket Programming, i am developing a TCP packets Sniffer, i am using Socket.BeginAccept, Socket.BeginReceive to capture every packet, but when a packet is received i have to process something, it is a fast operation, but would take some milliseconds, and then call the BeginReceive again. My question is, what would happen if some packets are sent while i am processing, and havent called BeginReceive??...are lost?...are buffered internally?...is there a limit?... Thanks in advance.

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