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  • Rails learn's confusion

    - by Steve
    This is a beginner's rails learning confusion. When I learn rails, from time to time, I feel frustrated on rails' principle "Convention over Configuration". Rails uses heavily on conventions. A lot of them are just naming conventions. If I forget a convention, I will either use the wrong naming and get unexpected result or get things magically done but don't understand how. Sometimes, I think of configuration. At least configuration lists everything clearly and nothing is in fog. In rails, there seems a hidden, dark contract between you and the machine. If you follow the contract, you communicate well. But a beginner usually forgets items listed on the contract and this usually leads to confusion. That's why when I first pick up rails, I feel like it is somehow difficult to learn. Besides, there are many other things that could be new to a learner, such as using git, using plugins from community, using RESTful routing style, using RSpec. All these are new and come together in learning ruby and rails. This definitely adds up difficulties for a beginner. In contrast, if you learn php, it wouldn't be that bad. You can forget many things and focus on learning php itself. You don't need to learn database handling if you know SQL already(in rails, you need to learn a whole new concept migration), you don't have to learn a new decent unit test(in rails, usually they teach RSpec along the way because rails is agile and you should learn test-driven development in the early learning stage), you don't have to learn a new version control(in rails, you will be taught about git anyway), you don't have to use complicated plugins(in rails, they usually use third-party plugins in textbook examples! what the hell? why not teach how to do a simplified similar thing in rails?), you don't have to worry RESTful style. All in all, when I learn php, I learn it quick and soon I start to write things myself. Learning php is similar to learning C/java. It tastes like those traditional languages. When I learn rails, it is more difficult. And I need to learn ruby as well (I believe many of you learn ruby just because of rails). Does anyone have the similar feeling as I have? How do you overcome it and start to master rails? Hints will be welcomed. Thank you.

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  • Convert executed SQL result to a list of Model object

    - by huynq9
    I'm wondering that is it possible to convert the executed query result to a list of models. I'm using Ruby with ActiveRecord and need to execute custom SQL query to join two or many tables. The code looks like below: connection = ActiveRecord::Base.connection sql = "select T1.f1, T2.f2 from T1 left join T2 on T1.id = T2.id" @result = connection.execute(sql) In Ruby code, I defined a models to manage the executed SQL result: class Model property :f1, :f2 end Is there any way to convert @result to list of Model object? so I can deal with each item in the list as following @result.each do |item| puts item.f1 puts item.f2 end

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  • How to give a timeout to an FTP connection

    - by dierre
    The story behind: Old script written in ruby 1.8.6 that opens a connection to a ftp and download a configuration file. For a specific client with a windows ftp server the script just hangs. The log stops writing after it opens the connection to the ftp. It's an old script, it's in ruby and I'm not an expert on it. What I tried: So I tried this implementation of a timeout to check if an ftp connection hangs out with this code Timeout::timeout(5) { ftp = Net::FTP.new(host,pass,host) } The problem is that this isn't working. My guess is that the interpreter stops on opening the connection and the timeout doesn't kill the connection because the interpreter is stuck. Is it possible that that's the problem? Could you tell me if there is maybe an alternative solution or if I'm doing something wrong?

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  • I need help to debug my XML parsing please

    - by Griffo
    I'm parsing this line: <type>branch</type> with this code if ([elementName isEqualToString:@"type"]) { [currentBranchDictionary setValue:currentText forKey:currentElementName]; } When I test the value in the type key, it does not contain branch but instead it contains branch\n. Here is the test I'm performing: if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch"]) { NSLog(@"no new-line"); } else if ([[currentBranchDictionary valueForKey:@"type"] isEqualToString:@"branch\n"]) { NSLog(@"new-line"); } this returns the "new-line" output I don't understand where the carriage return is being added, can anyone help?

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  • how to overwrite rcov method with loading custom file

    - by kdoya
    I use rcov 0.9.8 on ruby 1.9.1 and rvm for ROR application. Rcov has problem on ruby 1.9. I found solution for encoding problems from here. --- lib/rcov/code_coverage_analyzer.rb~ 2010-03-21 16:15:47.000000000 +0100 +++ lib/rcov/code_coverage_analyzer.rb 2010-03-21 16:11:49.000000000 +0100 @@ -250,6 +250,10 @@ end def update_script_lines__ + if '1.9'.respond_to?(:force_encoding) + SCRIPT_LINES__.each{|k,v| v.each{|src| src.try(:force_encoding, 'utf-8')}} + end + @script_lines__ = @script_lines__.merge(SCRIPT_LINES__) end But I want to overwrite method with loading custom file. Rcov does not have require option. Any ideas?

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  • feedback for programming newbies looking to build a social networking site?

    - by kgardnr
    my partner and i are launching a social learning platform - the requirements have been mapped out and are quite basic/intuitive. we are familiar with html/css, and have some very basic understanding of php, but we would love some feedback on whether we should tackle this ourselves or not. we've built websites, but in the past relied mostly on pre-fab code, i.e. wordpress, ning, etc. we've been looking specifically at ruby for developing the network, but i haven't delved into it fully yet. we're looking for some guidance and feedback - e.g. thoughts on ruby on rails? what's the learning curve? are we getting in over our heads? thanks in advance!

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  • ASP.net debug hangs until I delete vbproj.user

    - by Mike Robertson
    Intermittently when I start debugging a web application VS hangs (not responding). It will start OK if I run the appllication without debugging. When it has happened once it will do it every time until I delete the vbporj.user file. This problem appeared when I moved to Win7 64bit. I am using VS2008 Pro and everything is patched up to date. I am using the internal IIS7.

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  • debug error : max must have union class struct types

    - by hcemp
    this is my code: #include <iostream> using namespace std; class Sp { private : int a;int b; public: Sp(int x=0,int y=0):a(x),b(y){}; int max(int x,int y); }; int Sp::max(int a,int b) { return (a>b?a:b);}; int main() { int q,q1; cin>>q>>q1; Sp *mm=new Sp(q,q1); cout<< mm.max(q,q1); return 0; }

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  • stop script debug error dialogs occur in ie8 ?

    - by Haroldo
    I get this, clicking 'no' means the page displays flawlessly. it's refering to this part of jquery1.4.2.js: // Get the Nth element in the matched element set OR // Get the whole matched element set as a clean array get: function( num ) { return num == null ? // Return a 'clean' array this.toArray() : // Return just the object ( num < 0 ? this.slice(num)[ 0 ] : this[ num ] ); }, I assume i'm calling something in the wrong context somewhere in one of my js files (which would be a real mission to find). Will standard IE8 users get this error? (i imagine ms make it pretty difficult to reinstall ie!)

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  • WPF debug freezes computer with windows 7 64bit

    - by tcables
    Hello, I am using visual studio 2010 on Windows 7 64bit. I compiled and ran a simple application basically a thing a child could make. Well the second it started to run, it froze my computer and rendered it unresponsive. It continues to do this every time and for every application. Any ideas why this is happening?

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  • Sintra app in a gem

    - by JP
    I have a Sinatra application I've created and I'd like to package it as a gem-based binary. I have my gemspec and gem set up to generate a suitable executable that points to the my_sinatra_app.rb (which is executable) but the sinatra server never runs. Any ideas why and how to make it work? my_sinatra_app executable: #!/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby # # This file was generated by RubyGems. require 'rubygems' version = ">= 0" if ARGV.first =~ /^_(.*)_$/ and Gem::Version.correct? $1 then version = $1 ARGV.shift end gem 'my_sinatra_app', version load Gem.bin_path('my_sinatra_app', 'my_sinatra_app', version)

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  • Semicolon in object variable name

    - by milkfilk
    There's a common LDAP attribute called userCertificate;binary. It actually has a semi-colon in the attribute name. In ruby, I turn an LDAP entry into a OpenStruct object called 'struct'. struct.class = OpenStruct But of course ruby thinks it's an end-of-line character. ? struct.userCertificate;binary NameError: undefined local variable or method `binary' for main:Object from (irb):52 from :0 IRB knows that the local variable is there, because it gives me struct.userCertificate;binary from the tab auto-completion. I can also see the class variable when calling struct.methods on it. struct.methods = ... "send", "methods", "userCertificate;binary=", "hash", ... It's definitely there, I can see the contents if I print the whole variable to_s(). But how can I access the local variable when it has a semicolon in it? I have workarounds for this but I thought it was an interesting problem to post.

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  • RegQueryValueEx not working with a Release version but working fine with Debug

    - by Nux
    Hi. I'm trying to read some ODBC details form a registry and for that I use RegQueryValueEx. The problem is when I compile the release version it simply cannot read any registry values. The code is: CString odbcFuns::getOpenedKeyRegValue(HKEY hKey, CString valName) { CString retStr; char *strTmp = (char*)malloc(MAX_DSN_STR_LENGTH * sizeof(char)); memset(strTmp, 0, MAX_DSN_STR_LENGTH); DWORD cbData; long rret = RegQueryValueEx(hKey, valName, NULL, NULL, (LPBYTE)strTmp, &cbData); if (rret != ERROR_SUCCESS) { free(strTmp); return CString("?"); } strTmp[cbData] = '\0'; retStr.Format(_T("%s"), strTmp); free(strTmp); return retStr; } I've found a workaround for this - I disabled Optimization (/Od), but it seems strange that I needed to do that. Is there some other way? I use Visual Studio 2005. Maybe it's a bug in VS? Almost forgot - the error code is 2 (as the key wouldn't be found).

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  • How to debug "The type initializer for 'my class' threw an exception"

    - by JFB
    I am getting the exception: The type initializer for 'my class' threw an exception. in my browser after running my web application. Since this seems to be an error message generated from the view (.aspx), there is no way I can see the stack trace or any log for the source of this error. I have read a bit around the net and one solution to debugging is to throw a TypeInitializationException and then looking at the inner exception to find out what was wrong. How can I do this when I don't know where to surround code with a try/catch ?

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  • How to debug Perl program sudden exits?

    - by taw
    I have Perl program based on io::async, and it sometimes just exits after a few hours/days without printing any error message whatsoever. There's nothing in dmesg or /var/log either. STDOUT/STDERR are both autoflush(1) so data shouldn't be lost in buffers. It doesn't actually exit from IO::Async::Loop->loop_forever - print I put there just to make sure of that never gets triggered. Now one way would be to keep peppering the program with more and more prints and hope one of them gives me some clue. Is there better way to get information what was going on in a program that made it exit/silently crash?

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  • asp.net login controls droped error "object expected" when i click the "administer website" to debug

    - by user306032
    hello: i have just created a new empty website from visualstudio 2010, added an new webform and droped a login control into the page.when i click the tag "administer website" then try to open security-Use the security Setup Wizard to configure security step by step, the IE8 shows the error: "Object Expected". (tried to make a asp.net site with generated code, without any modification, but the error still occered)script type="text/javascript"

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  • How to implement/debug a sensor driver in ANDROID

    - by CVS-2600Hertz-wordpress-com
    Does anyone know of a walk-through or any examples of any code to setup sensors in android. I have the drivers available to me. Also i have implemented the sensors library as instructed in the Android-Reference along the sensors.h template. I am still unable to get any response at the apps level. How do i trace this issue? what might be the problem? Thanks in advance UPDATE: Jorgesys's link below points to a great APP to test if the sensor drivers are functioning properly or not. Not that i know they are not functioning, Any ideas of on where to dig??...

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  • stop cript debug error dialogs occur in ie8 ?

    - by Haroldo
    I get this, clicking 'no' means the page displays flawlessly. it's refering to this part of jquery1.4.2.js: // Get the Nth element in the matched element set OR // Get the whole matched element set as a clean array get: function( num ) { return num == null ? // Return a 'clean' array this.toArray() : // Return just the object ( num < 0 ? this.slice(num)[ 0 ] : this[ num ] ); }, I assume i'm calling something in the wrong context somewhere in one of my js files (which would be a real mission to find). Will standard IE8 users get this error? (i imagine ms make it pretty difficult to reinstall ie!)

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  • How do I debug JavaScript .onlick event?

    - by user3700824
    I'm learning JavaScript but seem to be having a problem. I have a piece of code that is executed when the page is fully loaded. The function then gathers all the button elements on my HTML page. From here I loop through getting each button's title attribute and then assign an onclick event to the button that is equal to a function that writes to the console.log with the title. I have tried various ways of doing this but it is not working. Here is the JavaScript code that I'm working with. Currently all it does is loop through calling the function and logging the tile to the console.log, but this is not supposed to happen. Each time I click the button it should call the function with its title and log that. window.onload = myPageIsReady; function myPageIsReady(){ var myList = document.getElementsByTagName("button"); var myTitle = []; for(var i = 0; i < myList.length; i++){ myTitle[i] = myList[i].getAttribute("title"); myList[i].onclick = getMyTitle(myTitle[i]); }; function getMyTitle(myTitle){ console.log(myTitle); }; };

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  • Finding position of each word in a sub-array of a multidimensional array

    - by Shreyas Satish
    I have an array: tokens = [["hello","world"],["hello","ruby"]] all_tokens = tokens.flatten.uniq # all_tokens=["hello","world","ruby"] Now I need to create two arrays corresponding to all_tokens, where the first array will contain the position of each word in sub-array of tokens. I.E Output: [[0,0],[1],[1]] # (w.r.t all_tokens) To make it clear it reads, The index of "hello" is 0 and 0 in the 2 sub-arrays of tokens. And second array contains index of each word w.r.t tokens.I.E Output: [[0,1],[0],[1]] To make it clear it reads,the index of hello 0,1. I.E "hello" is in index 0 and 1 of tokens array. Cheers!

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  • How to Debug Java Application using VIM/GVIM?

    - by Techmaddy
    I asked this question previously: http://stackoverflow.com/questions/495268/any-good-tutorial-for-moving-from-eclipse-to-vim From the inputs, I started using GVIM instead of Eclipse. I added ctags to it and I am able to navigate now comfortably. Only problem left for me is "Debugging"? I tried searching for some links, and couldn't a useful one? If anyone using or familiar with Java Debugging using vim/Gvim, can provide there inputs/ links/ tutorials, it would be very helpful. Thanks in advance.

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