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• Did we really always need to use Ruby/ rails plugin?

  - by Devlim

  I been intersted in ruby and rails lately but what I always encounter in blog/ podcast / book is they will always teach how to use ruby or rails plugin/ ruby instead of writing one. Did we really always need to use plugin, even thing like authorization? Authenticate? Is it really waste time Or hard to write from start? Then if it hard and waste time why rails say make web development less painful? Or I was wrong in term of concept? Goal ? Or anything else? Of rails? Anyone can guide me ?

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• validates_associated in production

  - by Rien

  Hi all. Imagine a simple model. class Service belongs_to :user validates_associated :user accepts_nested_attributes_for :user end Nothing special right? The validations on the associated User model trigger correctly in development mode. But don't do anything in production. I've added a validates_on_presence :user just like the docs say. This triggers when there's no User associated with the Service, but fill in one thing on the User model and nothing happens! It's driving me up the walls. Am I overlooking something? More info about the MVC: I use formtastic for the forms. Thanks!

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• Why there is an invalid context error?

  - by Tattat

  Here is the code I use to draw: - (void) drawSomething { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBStrokeColor(context, 1, 0, 0, 1); CGContextSetLineWidth(context, 6.0); CGContextMoveToPoint(context, 100.0f, 100.0f); CGContextAddLineToPoint(context, 200.0f, 200.0f); CGContextStrokePath(context); NSLog(@"draw"); } But I got the error like this: [Session started at 2010-04-03 17:51:07 +0800.] Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextSetRGBStrokeColor: invalid context Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextSetLineWidth: invalid context Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextMoveToPoint: invalid context Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextAddLineToPoint: invalid context Sat Apr 3 17:51:09 MacBook.local MyApp[12869] <Error>: CGContextDrawPath: invalid context Why it prompt me to say that the context is invalided?

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• How do I automate navigation to a website that requires authentication?

  - by Wiz

  Here's what I'm trying to achieve. I would like to write a script that will navigate to a website that requires me to be authenticated as myself, say Facebook, Live Spaces, Twitter or any other, and then have that script search for certain information on one of the pages of the website. I've done something similar in the past with the Windows.Forms WebBrowser control, which is a full blown implementation of IE that can be controlled through code and will store whatever cookies you get once you're authenticated, but it was very unfriendly to modify and I was hoping to use a scripting language instead, maybe Powershell or something of that sort. Are there maybe some good tutorials about this out there on the web? Thanks!

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• clear javascript console in Google Chrome

  - by Reigel

  Hi, I was wondering if I could clear up the console with some command.. console.log(), can print... is there a command to clear up console?.. I've tried to console.log(console); and got this functions below... assert: function assert() { [native code] } constructor: function Console() { [native code] } count: function count() { [native code] } debug: function debug() { [native code] } dir: function dir() { [native code] } dirxml: function dirxml() { [native code] } error: function error() { [native code] } group: function group() { [native code] } groupEnd: function groupEnd() { [native code] } info: function info() { [native code] } log: function log() { [native code] } markTimeline: function markTimeline() { [native code] } profile: function profile() { [native code] } profileEnd: function profileEnd() { [native code] } time: function time() { [native code] } timeEnd: function timeEnd() { [native code] } trace: function trace() { [native code] } warn: function warn() { [native code] } __proto__: Object [ I guess there's no way to clear up the console... but I wanted someone to say it to me... ]

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• Using mod_rewrite for a RESTful api

  - by razass

  Say the user is making a request to the following url: "http://api.example.com/houses/123/abc" That request needs to map to "/webroot/controls/houses.php" and send "123" and "abc" to houses.php as variables without modifying the http headers or body. "houses" could theoretically be anything; cars, boats; and map to the corresponding php file... cars.php, boats.php respectively with a fallback to index.php if there is no match. There can be any number of variables after "houses" ie) "http://api.example.com/houses/1234/abc/zxy/987" I think I already have ALL requests being sent to webroot using: <IfModule mod_reqrite.c> RewriteEngine on RewriteRule ^$ webroot/ [L] RewriteRule (.*) webroot/$1 [L] </IfModule> But now I am at a loss as to how to take the next step as mentioned above. Any help is appreciated, even if you feel that I am taking the wrong approach. Thanks in advance!

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• C command line password

  - by Jack Jacobsen

  So I'm trying to create a C program where you must input the password on the command line, like ./login password1 And if the password is password1, it'll say something. If not, it prints another message. This is the code I have now: #include <stdio.h> #include <stdlib.h> int main(int argc, char *argv[]) { if (argc < 2) { printf("usage: %s <password>\n", argv[0]); } char pass = "password"; if (argc == pass) { printf("Right\n"); } else { printf("Wrong\n"); } } But it wont work.

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• Some basic questions about Django, Pyjamas and Clean URLs

  - by Acidburn2k

  I am farily new to the topic, but I am trying to combine both Django and Pyjamas. What would be the smart way to combine the two? I am not asking about communication, but rather about the logical part. Should I just put all the Pyjamas generated JS in the base of the domain, say http://www.mysite.com/something and setup Django on a subdirectory, or even subdomain, so all the JSON calls will go for http://something.mysite.com/something ? As far as I understand now in such combination theres not much point to create views in Django? Is there some solution for clean urls in Pyjamas, or that should be solved on some oy,ther level? How? Is it a standard way to pass some arguments as GET parameteres in a clean url while calling a Pyjamas generated JS?

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• what is the best way to generate fake data for classification problem ?

  - by Berkay

  i'm working on a project and i have a subset of user's key-stroke time data.This means that the user makes n attempts and i will use these recorded attempt time data in various kinds of classification algorithms for future user attempts to verify that the login process is done by the user or some another person. (Simply i can say that this is biometrics) I have 3 different times of the user login attempt process, ofcourse this is subset of the infinite data. until now it is an easy classification problem, i decided to use WEKA but as far as i understand i have to create some fake data to feed the classification algorithm. can i use some optimization algorithms ? or is there any way to create this fake data to get min false positives ? Thanks

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• COMET with [Session ] TimeOut

  - by Amitd

  hi guys, Just Wondering how [Session] timeouts are(or can be) implemented when using Comet? I'm using Long polling Comet solution and want to implement a kind of Timeout feature. Example : If the user is on a Comet enabled page and doesn't respond to server events/notification for a period of time say 10 mins then invalidate his session and remove his request from server and redirect the user to a timeout page? Will this require Javascript XHR requests to check for a timeout explictly? Using ASP.NET 3.5 / C# (Doesn't need to be language specific) Thanks

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• How can I drag and drop a xaml activity to a WF4 rehosted designer?

  - by Louis Rhys

  I understand that the WorkflowDesigner can receive a dragged item in several ways, for example: By dragging an item from the toolbox and dropping it on the designer: an empty activity of that type will be inserted on the designer at the drop location. One can also drag an activity from the designer and drop it on another location in the designer, the dragged activity will be inserted at the drop location as well. Is it possible that similar to these two drag and drop mechanism, I can drag a xaml activity to the designer? What I have in mind is this, Let's say you have a ListView containing several xaml files. I want to be able to drag one of the ListView items (ie one of the xaml files), and when I drag it over the designer it will act as if I drag something from the toolbox (except the activity will be supplied from the xaml). I know I can create a runtime Activity from the file by using ActivityXamlServices.Load(filename), and I want this activity to be inserted at the drop location. But how to tell the application to understand this when I drag and drop?

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• Sharing memory among YACC, Lex, and C files

  - by sczizzo

  I have a YACC (Bison) grammar, a Lex (Flex) tokenizer, and a C program among which I need to share a struct (or really any variable). Currently, I declare the actual object in the grammar file and extern it wherever I need it (which is to say, my C source file), usually using a pointer to manipulate it. I have a shared header (and implementation) file between the C file and the grammar file with functions useful for manipulating my data structure. This works, but it feels a little uncomfortable. Is there a better way to share memory between the grammar and program?

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• Entity Relationship Diagramming

  - by Ben Aston

  I'd like to improve my understanding of cardinality constraints in ER diagrams. I have two entities: User Location But, I want the relationship between these two entities to be many-to-many (a user can be in many locations and a location can have many users). To do this I need to introduce an association class UserLocation. Is it correct to say I now have 3 entities? If I were to draw an ER diagam of the above, would I draw in the UserLocation entity, and would the cardinality look like this? User 1 ------ * User Location * ------ 1 Location

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• Adding UIViews with dynamic heights iphone

  - by Andy Jacobs

  in my viewcontroller's view i need to add a couple of custom UIView's, i do that in the loadView method so in my custom uiview's drawRect method i add a couple of UILabel's. in my viewcontroller's view i need to add all those custom UIView's underneath each other but i don't know what their height is sometimes 20px, 40px, 60px, depending on the outcome of the drawRect so when i init my custom UIView i give it a frame height of lets say 50.. but when the drawRect is done and it's only 20, 50 is too much so i need to adjust the frame height but how can i determine what's the visible height of the custom UIView and where can i catch it in my viewcontroller when the custom uiview has finished his drawRect method is there some kind of autoresize and where do i catch it in my viewcontroller, so i can position the custom uiview right under neath each other.

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• Chrome error with NO_MODIFICATION_ALLOWED_ERR DOM Exception 7

  - by HP

  I have below code to insert a style into DOM (there is a use case for injecting style into DOM so please don't ask why or say to load the css in .css file). <script type="text/javascript"> window.onload = function() { var bmstyle = document.createElement('style'); bmstyle.setAttribute('type', 'text/css'); var styleStr = "#test-div {background:#FFF;border:2px solid #315300;"; bmstyle.innerHTML = styleStr; document.body.appendChild(bmstyle); } </script> If I run in Firefox, it works fine. But I got this error in Google Chrome: Line bmstyle.innerHTML = styleStr; Uncaught Error: NO_MODIFICATION_ALLOWED_ERR: DOM Exception 7 Does anyone have a fix? Thanks

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• lucene.net get starting and end index of a highlighted fragment in a searched field

  - by user339995

  "My search returns a highlighted fragment from a field. I want to know that in that field of particular searched document, where does that fragment starts and ends ?" for instance. consider i am searching "highlighted fragment" in above lines (consider the above para as single document). I am setting my fragmenter as : SimpleFragmenter fragmenter = new SimpleFragmenter(30); now the output of GetBestFragment is somewhat like : "returns a highlighted fragment from" Is it possible to get the starting and ending index of this fragment in the text above (say starting is 10 and ending is 45)

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• All the sudden my links not working in php

  - by francesco

  hi guys, I have a page where all links where working properly but all the sudden some links are not working anymore. I am puzzling myself to undersand why. Nothing really changed. Maybe some css details. Is there anyone who can give a clue? Thank you for any help. me abou twhat might have happened. Francesco PS sorry forgot to say that looking at the source code the links are there and they work. In design view they just do nothing. They look like normal text.

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• How can I extract a URL from a sentence that is in a NSString?

  - by 0SX

  What I'm trying to accomplish is as follows. I have a NSString with a sentence that has a URL within the sentience. I'm needing to be able to grab the URL that is presented within any sentence that is within a NSString so for example: Let's say I had this NSString NSString *someString = @"This is a sample of a http://abc.com/efg.php?EFAei687e3EsA sentence with a URL within it."; I need to be able to extract http://abc.com/efg.php?EFAei687e3EsA from within that NSString. This NSString isn't static and will be changing structure and the url will not necessarily be in the same spot of the sentence. I've tried to look into the three20 code but it makes no sense to me. How else can this be done? Thanks for help.

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• java casting a list

  - by dcp

  Let's say I had: protected void performLogic(List<Object> docs) { ... } In the code where I'm going to be calling this method, I have a List<String> list. I want to call performLogic, passing this list. But it won't work because the lists are 2 different types: public void execute() { List<String> docs = new ArrayList<String>(); performLogin(docs); // won't work } I tried casting to List<Object> also, but that won't work either. So is the only way to do this is to make a new ArrayList of Object and just add the values and then pass it? Just seems cumbersome. I wondered if there was a better way to do it. Thanks.

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• How to retrive only one cell from MySQL table with PHP

  - by JuanCee

  I'm trying to create a forgotten password form that emails users their password. I'm having a problem, though, with the actual password part. You see, I have the email and comparing the email correct, except whenever I send the email I always get either "Your password is ." or "Your password is Array". I'm using: $check_email = mysql_num_rows(mysql_query("SELECT email FROM userRecovery WHERE email = '$to'")); if($check_email == 1){ $qtip = mysql_query("SELECT password FROM userRecovery WHERE email = '$to'"); $theirPassword = mysql_fetch_array($qtip); Rest of the Code... } I used to be able to do this correctly, but I haven't done PHP or MySQL in too long so it's slightly annoying (that, and I'm at a beginner-intermediate kind of level). I remember having this exact problem, but I don't have the code with me to find out what I did. If you think I left out a detail, please say so. Any help if appreciated.

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• c# XML add an XML node as a child to a particular other node

  - by kacalapy

  I have an XML doc with a structure like this: <Book> <Title title="Door Three"/> <Author name ="Patrick"/> </Book> <Book> <Title title="Light"/> <Author name ="Roger"/> </Book> I want to be able to melodramatically add XML nodes to this XML in a particular place. Lets say I wanted to add a Link node as a child to the author node where the name is Roger. I think it's best if the function containing this logic is passed a param for the name to add an XML node under, please advise and what's the code I need to add XML nodes to a certain place in the XML? Now I am using .AppendChild() method but it doesn't allow for me to specify a parent node to add under...

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• Sorting a file with 55K rows and varying Columns

  - by Prasad

  Hi I want to find a programmatic solution using C++. I have a 900 files each of 27MB size. (just to inform about the enormity ). Each file has 55K rows and Varying columns. But the header indicates the columns I want to sort the rows in an order w.r.t to a Column Value. I wrote the sorting algorithm for this (definitely my newbie attempts, you may say). This algorithm is working for few numbers, but fails for larger numbers. Here is the code for the same: basic functions I defined to use inside the main code: int getNumberOfColumns(const string& aline) { int ncols=0; istringstream ss(aline); string s1; while(ss>>s1) ncols++; return ncols; } vector<string> getWordsFromSentence(const string& aline) { vector<string>words; istringstream ss(aline); string tstr; while(ss>>tstr) words.push_back(tstr); return words; } bool findColumnName(vector<string> vs, const string& colName) { vector<string>::iterator it = find(vs.begin(), vs.end(), colName); if ( it != vs.end()) return true; else return false; } int getIndexForColumnName(vector<string> vs, const string& colName) { if ( !findColumnName(vs,colName) ) return -1; else { vector<string>::iterator it = find(vs.begin(), vs.end(), colName); return it - vs.begin(); } } ////////// I like the Recurssive functions - I tried to create a recursive function ///here. This worked for small values , say 20 rows. But for 55K - core dumps void sort2D(vector<string>vn, vector<string> &srt, int columnIndex) { vector<double> pVals; for ( int i = 0; i < vn.size(); i++) { vector<string>meancols = getWordsFromSentence(vn[i]); pVals.push_back(stringToDouble(meancols[columnIndex])); } srt.push_back(vn[max_element(pVals.begin(), pVals.end())-pVals.begin()]); if (vn.size() > 1 ) { vn.erase(vn.begin()+(max_element(pVals.begin(), pVals.end())-pVals.begin()) ); vector<string> vn2 = vn; //cout<<srt[srt.size() -1 ]<<endl; sort2D(vn2 , srt, columnIndex); } } Now the main code: for ( int i = 0; i < TissueNames.size() -1; i++) { for ( int j = i+1; j < TissueNames.size(); j++) { //string fname = path+"/gse7307_Female_rma"+TissueNames[i]+"_"+TissueNames[j]+".txt"; //string fname2 = sortpath2+"/gse7307_Female_rma"+TissueNames[i]+"_"+TissueNames[j]+"Sorted.txt"; string fname = path+"/gse7307_Male_rma"+TissueNames[i]+"_"+TissueNames[j]+".txt"; string fname2 = sortpath2+"/gse7307_Male_rma"+TissueNames[i]+"_"+TissueNames[j]+"4Columns.txt"; //vector<string>AllLinesInFile; BioInputStream fin(fname); string aline; getline(fin,aline); replace (aline.begin(), aline.end(), '"',' '); string headerline = aline; vector<string> header = getWordsFromSentence(aline); int pindex = getIndexForColumnName(header,"p-raw"); int xcindex = getIndexForColumnName(header,"xC"); int xeindex = getIndexForColumnName(header,"xE"); int prbindex = getIndexForColumnName(header,"X"); string newheaderline = "X\txC\txE\tp-raw"; BioOutputStream fsrt(fname2); fsrt<<newheaderline<<endl; int newpindex=3; while ( getline(fin, aline) ){ replace (aline.begin(), aline.end(), '"',' '); istringstream ss2(aline); string tstr; ss2>>tstr; tstr = ss2.str().substr(tstr.length()+1); vector<string> words = getWordsFromSentence(tstr); string values = words[prbindex]+"\t"+words[xcindex]+"\t"+words[xeindex]+"\t"+words[pindex]; AllLinesInFile.push_back(values); } vector<string>SortedLines; sort2D(AllLinesInFile, SortedLines,newpindex); for ( int si = 0; si < SortedLines.size(); si++) fsrt<<SortedLines[si]<<endl; cout<<"["<<i<<","<<j<<"] = "<<SortedLines.size()<<endl; } } can some one suggest me a better way of doing this? why it is failing for larger values. ? The primary function of interest for this query is Sort2D function. thanks for the time and patience. prasad.

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• Alpha transparent PNGs not displaying correctly in Mobile Safari

  - by worksology

  I'm using some semi-transparent PNGs as background-images on various websites. These are usually something like a 1x1 image with a 30-percent opaque white layer. I've noticed that Mobile Safari does not display them correctly, giving them a darker/grayish tint. I've created a couple test pages to illustrate. View them both in your normal browser, and then on Mobile Safari, and you should see what I mean. This shows 11 red images of varying opacities on white: http://thecompleteworks.org/alpha-tests/index-red.html This shows 11 white images of varying opacities on blue: http://thecompleteworks.org/alpha-tests/index.html Is this a MobileSafari bug (I couldn't imagine so), or do I need to do something different, either to my pages or PNGs? (Here's how I create the PNGs: In Photoshop, create a 1x1 transparent canvas. Draw a white rectangle in Layer 1. Set opacity to, say 30 percent, Save for Web as 24-bit PNG with transparency.)

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• programmatically logout a "specific" user

  - by MD_Oppenheimer

  Is it possible in Asp.NET MVC to proframmatically logout a user? I am aware that you can use: FormsService.SignOut(); But this refers to the context of the webpage making the request. I'm trying to prevent a user logging in twice. So if I call: MembershipUser membershipUser = Membership.GetUser(userName); if (membershipUser.IsOnline == true) { // log this user out so we can log them in again FormsService.SignOut(); } calling: FormsService.SignOut(); has no bearing on the context of the user say, with another webbrowser who is logged in already??

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• How to disable Events for a while in Javascript or jQuery

  - by Tarik

  Hello, I am wondering if you guys know different approach to disable an event for a while. Let me elaborate this more : Lets say I have a div or button which has a subscriber to its onclick event. To prevent the double click when the the methods are doing some ajax things, these are the some of the ways we can do : Disable the button till the method finishes its job Unbind till the methods finishes its job and then bind it again. Use some kind of flagging system like boolean so it will prevent method from working more than once. So is there any other ways, maybe some javascript tricks or jQuery tricks which is more efficient and better practice. Thanks in advance.

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