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  • `var = something rescue nil` behaviour

    - by JP
    In ruby you can throw a rescue at the end of an assignment to catch any errors that might come up. I have a function (below: a_function_that_may_fail) where it's convenient to let it throw an error if certain conditions aren't met. The following code works well post = {} # Other Hash stuff post['Caption'] = a_function_that_may_fail rescue nil However I'd like to have post['Caption'] not even set if the function fails. I know I can do: begin post['Caption'] = a_function_that_may_fail recsue end but that feels a little excessive - is there a simpler solution?

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  • When to use a namespace or a struct?

    - by Justen
    I was just reading a little bit on them from http://www.cplusplus.com/doc/tutorial/namespaces/ and it seems like a struct is capable of the same things? Or even a class for that matter. Maybe someone here can better define what a namespace is, and how it differs from a struct/class?

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  • What's the difference between reflow and repaint?

    - by Jon Raasch
    I'm a little unclear on the difference between reflow + repaint (if there's any difference at all) Seems like reflow might be shifting the position of various DOM elements, where repaint is just rendering a new object. E.g. reflow would occur when removing an element and repaint would occur when changing its color. Is this true?

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  • Append SQL table name with today's date

    - by Ricardo Deano
    Hello all. I understand that I can change a sql table using the follow sp: EXEC sp_rename 'customers', 'custs' How would I go about appending this so that the new table has today's date as a suffix? I've attempt variations on the below theme with little success!! EXEC sp_rename 'customers', 'customers +(CONVERT(VARCHAR(8),GETDATE(),3))' Any help greatly appreciated.

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  • How to open a .a file

    - by Mgst
    Heya! My name is Ale, and this is the first time that I post in this website. I've a little problem: I have to open a linker file, that have ".a" extension. I use Dev-C++, I don't know if it would be useful for you :-P I hope you will answer soon! Oh, and excuse me for my bad English, tell me if I made some mistakes! Thanks!!

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  • Alternative to before </body> tag inline Javascript

    - by Mohammad
    I know inline Javascript is frowned upon and with the new on-the-fly Javascript compressors that check for idle/unused function usage and omit the unused code, it seems good practice to have all your Javascript in an external file. My question is, in situations like FOUC (flash of unstyled content) which usually require little snippets of code right before the closing </body> tag, is there a JQuery resolution that would serve the same purpose, but from a remote Javascript file linked in the <head> of the document?

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  • xpath: string manipulation

    - by Jindan Zhou
    So in my scrapy project I was able to isolate some particular fields, one of the field return something like: [Rank Info] on 2013-06-27 14:26 Read 174 Times which was selected by expression: (//td[@class="show_content"]/text())[4] I usually do post-processing to extract the datetime information, i.e., 2013-06-27 14:26 Now since I've learned a little more on the xpath substring manipulation, I am wondering if it is even possible to extract that piece of information in the first place, i.e., in the xpath expression itself? Thanks,

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  • Good book on Castle Project?

    - by David
    Does anyone know of a good book on the Castle Project? I'm interested in learning more about any of the Castle projects (ActiveRecord, MonoRail, Windsor, anything!) and searches for Castle on Amazon are a little frustrating with the need to weed out all the fiction and nonsense.

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  • Events with QGraphicsItemGroup

    - by onurozcelik
    In my application I want to use QGraphicsItemGroup for grouping items into one item. I played with it a little and not sure using it because when I want to catch events, events are merged together but I want to handle specific event with specific child. How can I achieve this?

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  • How can I obtain a list of modified files within a 'changeset' range from team foundation server thr

    - by Colin W
    I'm trying to create a tool which will help my team perform code reviews on a more regular basis without it's usual massive overhead. At the moment the manual process involves using Team Foundation Sidekicks to identify the Changesets and then exporting that to excel to filter the results to find which items need to be reviewed (e.g. code files). I've heard mention of using a TFS API, but found very little help online possibly because I was asking google 'the wrong questions'.

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  • Email tracking techniques in php

    - by pandora
    Hi Everyone, I am doing a newsletter Management in php. I need to track the visitors who opens our newsletter, I have inserted the tracking image in newsletter thats seems to work little. Using Shift mailer there is option to embed an inline image to newsletter. Is it possible to track using this inline image? Is there any other techniques for tracking email.

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  • Any way to automatically wrap comments at column 80 in Visual Studio 2008? ..or display where column

    - by Jon Cage
    Is there any way to automatically wrap comments at the 80-column boundary as you type them? ..or failing that, any way to display a faint line at the coulmn 80 boundary to make wrapping them manually a little easier? Several other IDEs I use have one or other of those functions and it makes writing comments that wrap in sensible places much easier/quicker. [Edit] If (like me) you're using Visual C++ Express, you need to change the VisualStudio part of the key into VCExpress - had me confused for a while there!

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  • Regarding XML Parsing

    - by Anjan
    I am using IXMLDOMNodeListPtr , IXMLDOMNodePtr , IXMLDOMElementPtr and IXMLDOMDocPtr. I am having little confusion over here i.e. Should i have to call Release() on these pointers before they go out of scope. Thanks.

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  • SVN Tree Conflict Errors

    - by John
    I seem to see such errors quite often in our SVN 1.6 repo. We got these quite a lot while we used to just work on /trunk so I don't think it's due to merge/branching confusion. It seems that a cleup and marking the conflict resolved always works, but it's a little concerning to see errors in your version control system when you're just adding/updating/deleting files. What causes it?

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  • MATrix LABoratory interview questions?

    - by Shane
    I programmed in MATrix LABoratory for many years, but switched to using R exclusively in the past few years so I'm a little out of practice. I'm interviewing a candidate today who describes himself as an expert? What interview questions that I should be asking?

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  • jQuery slider vanishes after container div is toggled

    - by Shahar Evron
    I have a page which contains a jQuery-UI horizontal slider, created using a little function, inside a DIV which can be displayed / hidden by clicking on it's title, using $.toggle(). Problem is, once the div is hidden, when it is expanded the slider is gone. A simplified demo of the problem can be seen here: http://arr.gr/jquery-issue.html (file contains all relevant source code) - when clicking the "Advanced Options" title to hide and then show the div, the slider is no longer there. Any suggestions on how to work around this?

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  • Should I backup DBF file while it is open?

    - by wasim
    I need to create a little program that creates a backup copy of some DBF files on demand. the files are used by a custom designed Web application. Is it safe to copy a dbf file while it is open or do I need to close the web server so the files are released before safely creating a backup?

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  • Checklist for Launching public beta

    - by Vinayak
    I am developing a web app that is about to be opened for public beta. Does anyone know of or has prepared a checklist of the various steps that one needs to take to ensure a smooth beta implementation? The web app is coded using Java, MySQL on the server side and HTML, Javascript on the client side with a little Flash in one or two screens. I know this question is very non-specific, but I am looking for best practices/guidelines here. Thanks in advance.

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  • Django admin fails when using includes in urlpatterns

    - by zenWeasel
    I am trying to refactor out my application a little bit to keep it from getting too unwieldily. So I started to move some of the urlpatterns out to sub files as the documentation proposes. Besides that fact that it just doesn't seem to be working (the items are not being rerouted) but when I go to the admin, it says that 'urlpatterns has not been defined'. The urls.py I have at the root of my application is: if settings.ENABLE_SSL: urlpatterns = patterns('', (r'^checkout/orderform/onepage/(\w*)/$','checkout.views.one_page_orderform',{'SSL':True},'commerce.checkout.views.single_product_orderform'), ) else: urlpatterns = patterns('', (r'^checkout/orderform/onepage/(\w*)/$','commerce.checkout.views.single_product_orderform'), ) urlpatterns+= patterns('', (r'^$', 'alchemysites.views.route_to_home'), (r'^%s/' % settings.DAJAXICE_MEDIA_PREFIX, include('dajaxice.urls')), (r'^/checkout/', include('commerce.urls')), (r'^/offers',include('commerce.urls')), (r'^/order/',include('commerce.urls')), (r'^admin/', include(admin.site.urls)), (r'^accounts/login/$', login), (r'^accounts/logout/$', logout), (r'^(?P<path>.*)/$','alchemysites.views.get_path'), (r'^static/(?P<path>.*)$', 'django.views.static.serve', {'document_root':settings.MEDIA_ROOT}), The urls I have moved out so far are the checkout/offers/order which are all subapps of 'commerce' where the urls.py for the apps are so to be clear. /urls.py in questions (included here) /commerce/urls.py where the urls.py I want to include is: order_info = { 'queryset': Order.objects.all(), } urlpatterns+= patterns('', (r'^offers/$','offers.views.start_offers'), (r'^offers/([a-zA-Z0-9-]*)/order/(\d*)/add/([a-zA-Z0-9-]*)/(\w*)/next/([a-zA-Z0-9-)/$','offers.views.show_offer'), (r'^reports/orders/$', list_detail.object_list,order_info), ) and the applications offers lies under commerce. And so the additional problem is that admin will not work at all, so I'm thinking because I killed it somewhere with my includes. Things I have checked for: Is the urlpatterns variable accidentally getting reset somewhere (i.e. urlpatterns = patterns, instead of urlpatterns+= patterns) Are the patterns in commerce.urls valid (yes, when moved back to root they work). So from there I am stumped. I can move everything back into the root, but was trying to get a little decoupled, not just for theoretical reason but for some short terms ones. Lastly if I enter www.domainname/checkout/orderform/onepage/xxxjsd I get the correct page. However, entering www.domainname/checkout/ gets handled by the alchemysites.views.get_path. If not the answer (because this is pretty darn specific), then is there a good way for troubleshoot urls.py? It seems to just be trial and error. Seems there should be some sort of parser that will tell you what your urlpatterns will do.

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  • Remove the complete stying of a html button/submit

    - by Saif Bechan
    Is there a way of completely removing the styling of a button in Internet Explorer. I use a css sprite for my button, and everything looks ok. But when i click the button, it moves to the top a little, it makes it look out of shape. Is there a css click state, or mousedown? I don't know what triggers that state. I know it't not a really big deal, but sometimes it's the small things that matter.

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