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• insertNewObjectForEntityForName:inManagedObjectContext: returning NSNumber bug?

  - by beinstein

  I'm relatively well versed in CoreData and have been using it for several years with little or no difficulty. For the life of me, I can't figure out why insertNewObjectForEntityForName:inManagedObjectContext: is all of a sudden returning some sort of strange instance of NSNumber. GDB says the returned object is of the correct custom subclass of NSManagedObject, but when I go to print a description of the NSManagedObject itself, I get the following error: *** -[NSCFNumber objectID]: unrecognized selector sent to instance 0x3f26f50 What's even stranger, is that I'm able to set some relationships and attributes using setValue:forKey: and all is good. But when I try to set one specific relationship, I get this error: *** -[NSCFNumber entity]: unrecognized selector sent to instance 0x3f26f50 I've tried everything from clean all targets, to restarting both mac and iPhone, even editing the model so that the relationship in question is to-one instead of to-many. No matter what I do, the same problem appears. Has anyone ever seen anything like this before?

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• Project Idea with Hadoop MapReduce

  - by Aditya Andhalikar

  Hello, I learnt Hadoop a few months back and managed to do a very introductory programming project on it. I want to do a small - medium sized project or series of small programming assignments with Hadoop. I have seen lot of ideas around but I dont see anything that can be finished in about 60-70 hours of work so a pretty small scale project as I want to do that in my spare time along with other studies. Most project ideas I have seen sort of large to go on for 2-3 months. My main objective out of this exercise to develop good expertise in programming with Hadoop environment not to do any research or solve specific problems. I see Hadoop being used lot of with webservices maybe that would be an interesting track for small projects. Thank you in advance. Regards, Aditya

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• Spring MVC 3.0: Avoiding explicit JAXBElement<> wrapper in method arg

  - by Keith Myers

  I have the following method and want to avoid having to explicitly show the JAXBElement< syntax. Is there some sort of annotation that would allow the method to appear to accept raw MessageResponse objects but in actuality work the same as shown below? I'm not sure how clear that was so I'll say this: I'm looking for some syntactic sugar :) @ServiceActivator public void handleMessageResponse(JAXBElement<MessageResponse> jaxbResponse) { MessageResponse response = jaxbResponse.getValue(); MessageStatus status = messageStatusDao.getByStoreIdAndMessageId(response.getStoreId(), response.getMessageId()); status.setStatusTimestamp(response.getDate()); status.setStatus("Complete"); }

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• Geocode multiple addresses

  - by ace2600

  I need to geocode around 200 addresses per request and do around 3,000 request per day. I will be doing this server side using PHP. I have looked at http://stackoverflow.com/questions/98449/how-to-convert-an-address-to-a-latlon, but could not find a way for either Google Maps HTTP Request API or the Yahoo Geocoding REST API (cannot use JavaScript as this is server side) to send multiple addresses. I will be primarily using this to sort addresses based on the coordinates and if the API supports, fill in any missing data for each address. The addresses will be in the United States only. The addresses to geocode will be from user input, so be free form, like "street address, postal code", or "city, state", etc. Accuracy is not too important for the coordinates, say within five hundred feet or so. Is there a free API to handle this? Is there a way to get Yahoo or Google to do multiple locations in a request?

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• Finding recurrence relations of an algorithm

  - by Roarke

  I'm reading my algorithms text book, and I'm reading about recurrence relations and finding the algorithms big O complexity. I run across this line "In the case of the merge-sort algorithm, we get the recurrence equation: t(n) = b if n < 2 = 2t(n/2) +bn if n >= 2 for b > 0 my response was "how the heck did we know that?!?!" So i'm wondering if there is a systematic approach, or just a logical way of getting these recurrence relations from the algorithms can some one explain where the b and the two 2's come from?

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• Line numbering in Visual Studio

  - by Cyclone

  Why doesn't VS have any sort of line numbering? Is there any way to enable it, or a plugin for it? I know, the number of lines of code in a program doesn't matter, but sometimes it is nice to know how long a program is, or what line number something is for reference. I can't seem to find that as an option anywhere, to my surprise. Thanks for the help! This is Visual Studio 2010 Ultimate. (if you have read my older questions, I've been using 2008 Express until now.)

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• locking database record for editing

  - by sd_dracula

  I have a SQL 2008 DB and an asp.net frontend. I would like to implement a lock when a user is currently editing a record but unsure of which is the best approach. My idea is to have a isLocked column for the records and it gets set to true when a user pulls that record, meaning all other users have read only access until the first user finishes the editing. However, what if the session times out and he/she never saves/updates the record, the record will remain with isLocked = true, meaning others cannot edit it, right? How can I implement some sort of session time out and have isLocked be automatically set to false when the session times out (or after a predefined period) Should this be implemented on the asp.net side or the SQL side?

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• fuzzy DISTINCT Values

  - by user982853

  I have a database of real estate listings and need to return a list of neighborhoods. Right now I am using mysql DISTINCT which returns all of the distinct values. My probelm is that there is a lot of neighborhoods that have similar names: example: Park View Sub 1 Park View Park View Sub 2 Park View Sub 3 Great Lake Sub 1 Great Lake Sub 2 Great Lake Great Lake Sub 3 I am looking for an easy php or mysql solution that would recognize that "Park View" and "Great Lake" already exists and ONLY return "Park View" and "Great Lake". My initial thought is to some how get the sort order by length so that the short values are at the top and then loop through using strstr. This sound like a large task I am wondering if there is a function either in mysql or php that would easily do this.

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• Dealing with distractions

  - by Onorio Catenacci

  How can I cut-out distractions? Are noise-canceling headphones suitable, and are any specific models recommended? I had a fellow programmer that used to use some headphones to help her shut out distractions and focus on her work. Lately I find that I am less able to focus without quiet and therefore I'm thinking of investing in some headphones. I'm sorry – I suppose this is sort of an open-ended question but I don't want to spend $50 on headphones only to find out they won't help me.

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• Rails Full Engine using a Full Engine

  - by SirLenz0rlot

  I've got this full rails engine Foo with functionality X. I want to make another engine, engine Bar, that is pretty much the same, but override funcitonality x with y. (it basically does the same, but a few controller actions and views are differently implemented). (I might split this later in several mountable engines, but for now, this will be the setup: project Baz, using engine Bar, which uses engine Foo) I would like to know if there are any pitfalls. It doesn't seem like a pattern that is often used? Anybody else using this 'some sort of engine inheritance'?

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• arguments into instance methods in ruby

  - by aharon

  So, I'd like to be able to make a call x = MyClass.new('good morning', 'good afternoon', 'good evening', 'good night', ['hello', 'goodbye']) that would add methods to the class whose values are the values of the arguments. So now: p x.methods #> [m_greeting, a_greeting, e_greeting, n_greeting, r_greeting, ...] And p x.m_greeting #> "good morning" p x.r_greeting #> ['hello', 'goodbye'] I realize that this is sort of what instance variables are to do (and that if I wanted them immutable I could make them frozen constants) but, for reasons beyond my control, I need to make methods instead. Thanks!

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• Signal amplitude against time in Java

  - by wsr74ws84

  I'm racking my brain in order to solve a knotty problem (at least for me). While playing an audio file (using Java) I want the signal amplitude to be displayed against time. I mean I'd like to implement a small panel showing a sort of oscilloscope (spectrum analyzer). The audio signal should be viewed in the time domain (vertical axis is amplitude and the horizontal axis is time). Does anyone know how to do it? Is there a good tutorial I can rely on? Since I know very little about Java, I hope someone can help me.

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• Binary search of unaccesible data field in ldap from python

  - by EricR

  I'm interested in reproducing a particular python script. I have a friend who was accessing an ldap database, without authentication. There was a particular field of interest, we'll call it nin (an integer) for reference, and this field wasn't accessible without proper authentication. However, my friend managed to access this field through some sort of binary search (rather than just looping through integers) on the data; he would check the first digit, check if it was greater or less than the starting value, he would augment that until it returned a true value indicating existence, adding digits and continuing checking until he found the exact value of the integer nin. Any ideas on how he went about this? I've access to a similarly set up database.

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• Dynamically formatting a string

  - by TofuBeer

  Before I wander off and roll my own I was wondering if anyone knows of a way to do the following sort of thing... Currently I am using MessageFormat to create some strings. I now have the requirement that some of those strings will have a variable number of arguments. For example (current code): MessageFormat.format("{0} OR {1}", array[0], array[1]); Now I need something like: // s will have "1 OR 2 OR 3" String s = format(new int[] { 1, 2, 3 }); and: // s will have "1 OR 2 OR 3 OR 4" String s = format(new int[] { 1, 2, 3, 4 }); There are a couple ways I can think of creating the format string, such as having 1 String per number of arguments (there is a finite number of them so this is practical, but seems bad), or build the string dynamically (there are a lot of them so this could be slow). Any other suggestions?

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• Change spring bean properties at configuration time

  - by Nick Gerakines

  In a spring servlet xml file, I'm using org.springframework.scheduling.quartz.SchedulerFactoryBean to regularly fire a set of triggers. <bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> <property name="triggers"> <list> <ref local="AwesomeTrigger" /> <ref local="GreatTrigger" /> <ref local="FantasticTrigger"/> </list> </property> </bean> The issue is that in different environments, I don't want certain triggers firing. Is there a way to include some sort of configuration or variable defined either in my build.properties for the environment or in a spring custom context properties file that assists the bean xml to determine which triggers should be included in the list? That way, for example, AwesomeTrigger would be called in development but not qa.

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• Monitor database table for external changes from within Rails application

  - by jhwist

  I'm integrating some non-rails-model tables in my Rails application. Everything works out very nicely, the way I set up the model is: class Change < ActiveRecord::Base establish_connection(ActiveRecord::Base.configurations["otherdb_#{RAILS_ENV}"]) set_table_name "change" end This way I can use the Change model for all existing records with find etc. Now I'd like to run some sort of notification, when a record is added to the table. Since the model never gets created via Change.new and Change.save using ActiveRecord::Observer is not an option. Is there any way I can get some of my Rails code to be executed, whenever a new record is added? I looked at delayed_job but can't quite get my head around, how to set that up. I imagine it evolves around a cron-job, that selects all rows that where created since the job last ran and then calls the respective Rails code for each row.

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• ruby / rails boolean method naming conventions

  - by Dennis

  I have a short question on ruby / rails method naming conventions or good practice. Consider the following methods: # some methods performing some sort of 'action' def action; end def action!; end # some methods checking if performing 'action' is permitted def action?; end def can_action?; end def action_allowed?; end So I wonder, which of the three ampersand-methods would be the "best" way to ask for permissions. I would go with the first one somehow, but in some cases I think this might be confused with meaning has_performed_action?. So the second approach might make that clearer but is also a bit more verbose. The third one is actually just for completeness. I don't really like that one. So are there any commonly agreed-on good practices for that?

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• Filter user input (paragraph) for links + smileys

  - by Alec Smart

  Hello, I am looking at some sort of existing filter which can sanitize the user input to avoid XSS. Probably I can use htmlspecialchars for that. But at the same time I want to be able to parse all links (should match a.com, www.a.com and http://www.a.com and if it is http://www.aaaaaaaaaaaaaaaaaaaaaaaaaa.com then it should display it as aaa..a.com), e-mails and smileys. I am wondering what is the best way to go about it. I am currently using a php function with some regex, but many times the regex simply fails (because of link recognition is incorrect etc.). I want something very similar to the parser used during Google Chat (even a.com works). Thank you for your time.

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• Is there a SQL Server error numbers C# wrapper anyone knows of?

  - by Mr Grok

  I really want to do something useful when a PK violation occurs but I hate trapping error numbers... they just don't read right without comments (they're certainly not self documenting). I know I can find all the potential error numbers at SQL Server books online but I really want to be able to pass the error number to some helper class or look it up against a Dictionary of some sort rather than have non-descript err numbers everywhere. Has anyone got / seen any code anywhere that encapsulates the SQL Server Error numbers in this way as I don't want to re-invent the wheel (or I'm lazy maybe).

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• Making your class an event source in Java

  - by Crystal

  I'm making a custom button in Java that has two states, mousePressed, and mouseReleased. At the same time, if I wanted to reuse this button, so that other event listeners can register with it, are these the appropriate steps I should do: override addActionListener(ActionListener action) override removeActionListener(ActionListener action) have a private variable like List <ActionListener> list = new List <ActionListener>() to keep track of when events get added and some sort of function with for loop to run all the actions: public void runListeners() { for (ActionListener al : list) { al.actionPerfomed; } } I'm not really sure if this is the way you can do it or if there are other things I am missing. Like does my custom class have to be implements ActionListener? Thanks.

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• I have a bunch of divs floated left, lined up in columns with different heights. They dont create a

  - by Roeland

  Hey guys, I am trying to create a grid like system with div's with content floated left. The problem is that the height of each div is not static since the content is different in each one. Since the height is different.. things get outta whack if one is taller then another in one row. Is there some sort of css way or js (prefer javascript) way to get around this. I really want to avoid setting large heights on the divs to get them to line up. You can see the example here: http://www.foreclosurejournalinc.com/index.php?option=com_hotproperty&view=type&id=1

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• How can one make a web-site accessible only when someone has a dongle?

  - by Brian M. Hunt

  Suppose you want to add an extra layer of credentials on top of a SSL-encrypted login/password, but you don't want to increase complexity to the user. Is there a way to add the requirement of the possession of a dongle to web-server authentication schemes with existing cross-platform browser capabilities? In other words, to get access to the web-site, you would need a username, password, and a USB dongle that has been plugged into the client computer. The dongle would presumably do some sort of challenge/response. It'd be ideal if this dongle solution worked with Firefox automatically or with the simple addition of a plugin. Thoughts and suggestions are appreciated.

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• License similar to the MIT license but without the ability to sell?

  - by Ben

  I'm trying to decide how I want to license my Wordpress themes to the public. I know that the GPL is recommended to Wordpress theme creators, however I feel it might not be liberal enough for me because I want businesses to be able to use them if they want to. I really like the MIT license, the only thing that gets me is the freedom to sell part. I don't want someone taking my themes and selling them on some theme farm site, they should be free for everyone, however I don't want to require them to republish any changes under the MIT as well, I think that that freedom should remain intact. Is there a license that sort of fits into the terms I specified here? I'm not a lawyer so I have trouble reading through the complicated language of licenses. If there is not a similar license to the MIT but with the terms I have specified, should I just license under a modified MIT? If so, can anyone help me write it? Thanks very much!

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• Access Edit Mode Values of BindingSource Control

  - by Christopher Edwards

  I have a BindingSource control (http://msdn.microsoft.com/en-us/library/system.windows.forms.bindingsource.aspx) with a datasource of a (single) Linq object. If I change any of the properties of the underlying Linq-to-Sql object then all the other changes on the bound controls on the form are lost. Does anyone now why and how I work around it? I don't want to call EndEdit because this will commit the changes to the underlying object. I think this might be because my underlying object linq-to-sql object does not implement IEditableObject so the potental new values for the object fields are sort of stored in the forms controls. Can anyone either clarify what is going on and/or suggest a work around. Thanks!

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• scroll bar important query???

  - by rajesh

  Hello all, actually i downloaded code for scroll from....... http://sorgalla.com/jcarousel/ but when i added it in my page and add using code ... function addElement(url,imagePath){ alert(url); alert(imagePath); var container = document.getElementById('sncs'); items = container.getElementsByTagName("li"); //alert(items.length); var new_element = document.createElement('li'); new_element.innerHTML =""; //var raj='1'+new_element.innerHTML; //alert() new_element.className="jcarousel-item jcarousel-item-horizontal jcarousel-item-4 jcarousel-item-4-horizontal"; //container.insertBefore(new_element, container.firstChild); container.appendChild( new_element ); } it added li not at the end but below scroll what will be the problem..... Please help me to sort out this problem....

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