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  • Rails after_create callback can't access model's attributes

    - by tybro0103
    I can't access my model's attributes in the after_create callback... seems like I should be able to right? controller: @dog = Dog.new(:color => 'brown', :gender => 'male') @dog.user_id = current_user.id @dog.save model: class Dog < ActiveRecord::Base def after_create logger.debug "[DOG CREATED] color:#{color} gender:#{gender} user:#{user_id}" end end console: (all seems well) >>Dog.last =>#<Dog id: 1, color: "brown", gender: "male", user_id: 1> log: (wtf!?) ... [DOG CREATED] color: gender:male user ... Some of my attributes show up and others don't! oh no! Anyone know what I'm doing wrong? I've always been able to user after_create in such ways in the past. Note: The actual variable names and values I used were different, but the methods and code are the same.

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  • Retrieve Grid Id on CellEdit JqGrid

    - by Sergio
    Hi guys, i was trying to do a Cell Editing based on this documentation http://www.trirand.com/jqgridwiki/doku.php?id=wiki:cell_editing I have two questions: How can i get the Index of my row posted to the server: The information i'm getting posted is the following: a) value of the cell b) RowId The thing is that the rowId doesn't help me. I need the actual Id of the information I'm displaying so i can do the server update with that Id. colNames: ['Id', 'Codigo', 'Nombre'], colModel: [ { name: 'Id', index: 'Id', width: 50, align: 'left', hidden: true }, { name: 'Codigo', index: 'Codigo', width: 55, align: 'left', editable: true, editrules: { number: true} }, { name: 'Nombre', index: 'Nombre', width: 200, align: 'left' }], I need the value of the column 'Id' to do my update. 2.I don't understand in the documentation how to manage an error from the server, so I can display the error message. Thank you very much! Notes: a) I've already asked in the forum of trirand, but no one reply it to me. b) If anyone has done this, it would help if help me pasting the code. c) I'm working on MVC 2 Asp.net

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  • Read / write program in Java using JFileChooser

    - by Casper Marcussen
    Didn't want to bother people in here, but since I am under a time pressure, I am desperate to get help. My questions is how to link the file choosen from a JFileChooser to a file, and how to convert it to string being able to display and edit it in a TextArea. I have the GUI set up using swing, but the link between actionListener and the JFileChooser is not complete. Any help would be much appreciated. Code: http://pastebin.com/p3fb17Wi EDIT: I found this program, that does pretty much what i wanted to, but it does not allow me to save the actual file : http://www.java-forums.org/new-java/8856-how-get-content-text-file-write-jtextarea.html

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  • How would you adblock using Python?

    - by regomodo
    I'm slowly building a web browser in PyQt4 and like the speed i'm getting out of it. However, I want to combine easylist.txt with it. I believe adblock uses this to block http requests by the browser. How would you go about it using python/PyQt4? [edit1] Ok. I think i've setup Privoxy. I haven't setup any additional filters and it seems to work. The PyQt4 i've tried to use looks like this self.proxyIP = "127.0.0.1" self.proxyPORT= 8118 proxy = QNetworkProxy() proxy.setType(QNetworkProxy.HttpProxy) proxy.setHostName(self.proxyIP) proxy.setPort(self.proxyPORT) QNetworkProxy.setApplicationProxy(proxy) However, this does absolutely nothing and I cannot make sense of the docs and can not find any examples. [edit2] I've just noticed that i'f I change self.proxyIP to my actual local IP rather than 127.0.0.1 the page doesn't load. So something is happening.

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  • A simple explanation of Naive Bayes Classification

    - by Jaggerjack
    I am finding it hard to understand the process of Naive Bayes, and I was wondering if someone could explained it with a simple step by step process in English. I understand it takes comparisons by times occurred as a probability, but I have no idea how the training data is related to the actual dataset. Please give me an explanation of what role the training set plays. I am giving a very simple example for fruits here, like banana for example training set--- round-red round-orange oblong-yellow round-red dataset---- round-red round-orange round-red round-orange oblong-yellow round-red round-orange oblong-yellow oblong-yellow round-red

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  • Android - Notification bar height from a service

    - by Vitaliy
    Hi, The application I'm working on is a service which runs in the background in android. The problem is that I need to determine the height of the notification bar for some functionality of the service. I found a number of solutions for this, for regular activities - a view inside an activity can determine its own height without the notification bar, based on checking its actual view size from its onSizeChanged event, after it is already drawn. However, this is not applicable to a service which has no physical view drawn. I would really appreciate any ideas on getting the size of the notification bar at a system level, perhaps? Thanks so much! Vitaliy

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  • Alternative to COM blind aggregation in .NET for class with private interface

    - by Philip
    When extending a COM class in unmanaged C++ where the original class has private interfaces, one way to do this is through the concept of blind aggregation. The idea is that any interface not explicitly implemented on the outer aggregating class is 'blindly' forwarded to the inner aggregated class. Now .NET as far as I can figure out does not support COM aggregation natively. A somewhat tedious workaround is to create a .NET class where you implement all the required COM interfaces directly on the .NET class and simply forward to an instance of the actual COM class for any methods you don't want to override. The problem I have is when the original COM object has one or more private interfaces, i.e. undocumented interfaces that are nonetheless used by some consumers of the original class. Using blind aggregation in unmanaged C++ this is a non-issue as the calls to the private interfaces are automatically forwarded to the original class, however I can't find any way of doing the same thing in .NET. Are there any other ways of accomplishing this with .NET?

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  • PHP MSSql Connection

    - by ajithperuva
    I am usign mssql as my backend for program.when i am try to connect with database which not shows any type of errors,but it is not working.Which is not getting connection. My code is like mssql_connect('localhost', 'db_user', 'db_password') or die('Error'); The funny thing is which is not connecting and also which is not show message Error.Why it is?Anybody can help me...please.... How can we enable mssql configuration using php program(what is the script for that.not manually).How could we know the actual status of mssql in server? Please help me.My application is working properly in local;the problem is about public hosting.

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  • What could cause a button on a UIActionSheet to "miss" on touches?

    - by Alex Gosselin
    I have a UIActionSheet as follows: UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:[NSString stringWithFormat: @"Cancel New %@? Changes will be lost.", [creator propertyName]] delegate:self cancelButtonTitle:@"Stay Here" destructiveButtonTitle:@"Discard and Close" otherButtonTitles:@"Save and Close", nil]; [sheet showInView:self.view]; [sheet release]; It creates the action sheet, The buttons display, the Destructive button is on top, cancel button is on the bottom, other button (save and close) shows up in the middle, the top two buttons, (destructive and other) work fine, but the bottom button has a gap, so it is farther down than the other buttons. For some reason though, in order to press the button I need to touch where it would be if there was no gap. Touching the actual button doesn't work. Sorry if this isn't super clear, has anyone encountered something like this? I don't like to whip out the "I found a bug" card too fast, maybe I'm doing something wrong here.

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  • Strcpy() corrupts the copied string in Solaris but not Linux

    - by strictlyrude27
    Hi all, I'm writing a C code for a class. This class requires that our code compile and run on the school server, which is a sparc solaris machine. I'm running Linux x64. I have this line to parse (THIS IS NOT ACTUAL CODE BUT IS INPUT TO MY PROGRAM): while ( cond1 ){ I need to capture the "while" and the "cond1" into separate strings. I've been using strtok() to do this. In Linux, the following lines: char *cond = NULL; cond = (char *)malloc(sizeof(char)); memset(cond, 0, sizeof(char)); strcpy(cond, strtok(NULL, ": \t\(){")); //already got the "while" out of the line will correctly capture the string "cond1".Running this on the solaris machine, however, gives me the string "cone1". Note that in plenty of other cases within my program, strings are being copied correctly. (For instance, the "while") was captured correctly. Does anyone know what is going on here?

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  • TypeInitilazationException When Getting an NHibernate Session

    - by Paul Johnson
    I’ve run into what appears to be an NHibernate config problem. Basically, I ran up a simple proof of concept persistence integration test using NUnit, the test simply querys an Oracle database and successfully returns the last record received by the underlying table. However, when the assemblies are taken out of the NUnit test environment and deployed as they would be for an actual application build, my call for an NHibernate session results in a ‘TypeInitializationException’ whilst executing the code line: sessionFactory = New Configuration().Configure().BuildSessionFactory() The application is a vb.net console app running against an Oracle 9.2 database, using a ‘coding framework’ published on the web by Bill McCafferty entitled 'NHibernate Best Practices with ASP.NET' (pre S#harp Architecture). I am running version 2.1.2.4000 of NHibernate. Any assistance much appreciated. Kind Regards Paul J.

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  • How do you implement Software Transactional Memory?

    - by Joseph Garvin
    In terms of actual low level atomic instructions and memory fences (I assume they're used), how do you implement STM? The part that's mysterious to me is that given some arbitrary chunk of code, you need a way to go back afterward and determine if the values used in each step were valid. How do you do that, and how do you do it efficiently? This would also seem to suggest that just like any other 'locking' solution you want to keep your critical sections as small as possible (to decrease the probability of a conflict), am I right? Also, can STM simply detect "another thread entered this area while the computation was executing, therefore the computation is invalid" or can it actually detect whether clobbered values were used (and thus by luck sometimes two threads may execute the same critical section simultaneously without need for rollback)?

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  • Precompile Lambda Expression Tree conversions as constants?

    - by Nathan
    It is fairly common to take an Expression tree, and convert it to some other form, such as a string representation (for example this question and this question, and I suspect Linq2Sql does something similar). In many cases, perhaps even most cases, the Expression tree conversion will always be the same, i.e. if I have a function public string GenerateSomeSql(Expression<Func<TResult, TProperty>> expression) then any call with the same argument will always return the same result for example: GenerateSomeSql(x => x.Age) //suppose this will always return "select Age from Person" GenerateSomeSql(x => x.Ssn) //suppose this will always return "select Ssn from Person" So, in essence, the function call with a particular argument is really just a constant, except time is wasted at runtime re-computing it continuously. Assuming, for the sake of argument, that the conversion was sufficiently complex to cause a noticeable performance hit, is there any way to pre-compile the function call into an actual constant?

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  • Using Visual sudio .ncb file for reflection.

    - by Rushi
    I am developing visual game level editor in c++. For this I want reflection(RTTI) mechanism to know class attributes at runtime. I am currently using PDB files for this.But using PDB I couldn't retrieve actual code line for extra information in commented format which is given for that attribute. Visual studio uses NCB files for intelligence. So will it be better idea to use NCB instead PDB? If yes,How to retrieve information from NCB files? Is there any SDK like DIA SDK?

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  • Talking to an Authentication Server

    - by Kyle Terry
    I'm building my startup and I'm thinking ahead for shared use of services. So far I want to allow people who have a user account on one app to be able to use the same user account on another app. This means I will have to build an authentication server. I would like some opinions on how to allow an app to talk to the authentication server. Should I use curl? Should I use Python's http libs? All the code will be in Python. All it's going to do is ask the authentication server if the person is allowed to use that app and the auth server will return a JSON user object. All authorization (roles and resources) will be app independent, so this app will not have to handle that. Sorry if this seems a bit newbish; this is the first time I have separated authentication from the actual application.

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  • Catch not working and how to unset the exception handler

    - by neoneye
    catch is not working because there is installed an exception handler using set_exception_handler() I need "catch" to work, so I guess I need to unset the exception handler somehow. Things such as set_exception_handler(NULL) isn't working. Any ideas how to unset the exception handler? function my_exception_handler($exception) { error_log("caught exception: " . $exception->getMessage() ); } set_exception_handler("my_exception_handler"); // QUESTION: how does on unset it ? //set_exception_handler(NULL); try { throw new Exception('hello world'); error_log("should not happen"); } catch(Exception $e) { error_log("should happen: " . $e->getMessage()); } Actual output: caught exception: hello world Desired output: should happen: hello world

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  • Encode JSON data into another JSON object

    - by jburns20
    I have a JSON string that I would like to include as a value in a larger JSON object that I am creating from an array. How can I create the larger JSON object without php escaping the string, and without having to decode the previously encoded string? For example, if my JSON string is: $encoded_already = '{"encoded_key": "encoded_value"}'; And I would like to include it in my array and json_encode() it: $new_array = array( "some_other_key" => $some_value, "premade_data" => $encoded_already ); $output = json_encode($new_array); but I want to have the $encoded_already string be included as actual JSON, not just an escaped string.

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  • Have you been in cases where TDD increased development time?

    - by BillyONeal
    Hello everyone :) I was reading http://stackoverflow.com/questions/2512504/tdd-how-to-start-really-thinking-tdd and I noticed many of the answers indicate that tests + application should take less time than just writing the application. In my experience, this is not true. My problem though is that some 90% of the code I write has a TON of operating system calls. The time spent to actually mock these up takes much longer than just writing the code in the first place. Sometimes 4 or 5 times as long to write the test as to write the actual code. I'm curious if there are other developers in this kind of a scenario.

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  • Generate n-dimensional random numbers in Python

    - by Magsol
    I'm trying to generate random numbers from a gaussian distribution. Python has the very useful random.gauss() method, but this is only a one-dimensional random variable. How could I programmatically generate random numbers from this distribution in n-dimensions? For example, in two dimensions, the return value of this method is essentially distance from the mean, so I would still need (x,y) coordinates to determine an actual data point. I suppose I could generate two more random numbers, but I'm not sure how to set up the constraints. I appreciate any insights. Thanks!

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  • Coordinating the logging output from a web app installed in a SharePoint farm.

    - by Kelly French
    We are deploying web parts to SharePoint 2007 and would like to include logging (log4net). The ideal solution would be to use a database appender to avoid the problems with knowing which actual server is executing the web part. This questions has been helpful: http://stackoverflow.com/questions/219668/sharepoint-and-log4net. I've got log4net working in a stand-alone web app using Visual Studio dev server using the web.config for the log4net settings and a file appender for the output. I'd like to transition to SharePoint and still use the log file output so I can make sure it's all working first, then change the config around to log to a database. Is this going to be too much trouble? How have other developers added log4.net into their solutions for SharePoint?

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  • Map Custom URL protocol to HTTP (using NSURLProtocol?)

    - by Francisco Ryan Tolmasky I
    I have an application using a WebKit WebView and I'd like to map URL's that are loaded in this WebView with a custom URL protocol to a different HTTP URL. For example, say I am loading: custom://path/to/resource I would like to internally actually load: http://something-else.com/path/to/resource In other words, the custom protocol serves almost as a shorthand. I can't however use -webView:resource:willSendRequest:redirectResponse:fromDataSource:, because I want WebKit to actually believe this is the URL in question, not to simply redirect from one to the other. So far I've been attempting to use a custom NSURLProtocol subclass. However, this is proving trickier than I first thought because, at least to my understanding, I will have to do the actual loading myself in the NSURLProtocol subclass' startLoading method. I'd like a way to just hand off the work to the existing HTTP protocol loader, but I can't find an easy way to do this. Does anyone have a recommendation for this, or perhaps an alternative way to solve this issue? Thanks!

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  • Python: split a list based on a condition?

    - by Parand
    What's the best way, both aesthetically and from a performance perspective, to split a list of items into multiple lists based on a conditional? The equivalent of: good = [x for x in mylist if x in goodvals] bad = [x for x in mylist if x not in goodvals] is there a more elegant way to do this? Update: here's the actual use case, to better explain what I'm trying to do: # files looks like: [ ('file1.jpg', 33L, '.jpg'), ('file2.avi', 999L, '.avi'), ... ] IMAGE_TYPES = ('.jpg','.jpeg','.gif','.bmp','.png') images = [f for f in files if f[2].lower() in IMAGE_TYPES] anims = [f for f in files if f[2].lower() not in IMAGE_TYPES]

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  • How to avoid HTML Canvas auto-stretching

    - by Tom
    I have the following piece of HTML: <style type="text/css"> #c{width:200px;height:500px} </style> <canvas id="c"></canvas> <script type="text/javascript"> var i = new Image(); i.onload = function () { var ctx = document.getElementById('c').getContext('2d'); ctx.drawImage(i, 0, 0); } i.width = i.height = 20; // actual size of square.png i.src = 'square.png'; </script> The issue is that the drawn image is automatically stretched (resized) proportionally with the size of the canvas. I have tried using all available parameters (drawImage(i, 0, 0, 20, 20, 0, 0, 20, 20)) and that didn't help. What is causing my drawing to stretch and how can I prevent that? Thanks, Tom

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  • Using EXSLT dates-and-times module in XSLT 1.0 yields unknown error

    - by danielle
    I added the EXSLT dates-and-times module in my XSLT 1.0 file by declaring: <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" ... xmlns:date="http://exslt.org/dates-and-times" extension-element-prefixes="date"> This doesn't affect my resulting page, but when I try to call the actual date with: <xsl:value-of select="date:date-time()"/> I receive an "Error loading stylesheet: An unknown error has occurred ()" message when loading my page. Does anyone have a suggestion as to what I might be missing? Thanks in advance!

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  • Django DecimalField returns "None" instead of empty value

    - by Ed
    Is there a way to force django to display nothing instead of "None" for a Decimal Field that's been left blank? In my template, I show a list of all the values for a particular field. Each value is hyperlinked to a page that displays the results of a query filtered on that value. But because there are some entries with null value, my list includes actual DecimalField entries and "None" for all those that are empty. When a user clicks on None, django throws a validation error because you cannot query a DecimalField using a string. I could write if statements checking all instances of decimal fields for Nones and skipping them, but that is far from an elegant solution. Any advice? This is one part of the code, though there are other templates that derive the None value in slightly different manners: {% for item in choices %} <a href={% url app_views.field_choice item %}>{{ item }}</a><br> {% endfor %}

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