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  • rails - REST or create another method

    - by user1304740
    Let's assume we have two models linked with a 1-to-many relationship (like clients and invoices - a client can have many invoices). In a view of a 'client' (let's say the 'show' view), there is a form to capture an 'invoice'. I found 2 approaches: This form should be handled by the 'invoice' controller (method create), having client_id passed as a parameter This form should be handled by a new method in 'client' controller, probably a PUT method defined in routes.rb. Is there a 'Rails way', or both of them are good? Is there a preffered way? Thanks!

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  • Constructors and method chaining in JavaScript

    - by Sethen Maleno
    I am trying to make method chaining work in conjunction with my constructors, but I am not exactly sure how to go about it. Here is my code thus far: function Points(one, two, three) { this.one = one; this.two = two; this.three = three; } Points.prototype = { add: function() { return this.result = this.one + this.two + this.three; }, multiply: function() { return this.result * 30; } } var some = new Points(1, 1, 1); console.log(some.add().multiply()); I am trying to call the multiply method on the return value of the add method. I know there is something obvious that I am not doing, but I am just not sure what it is. Any thoughts?

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  • Custom authentication method for GDM

    - by FMC
    I am trying to find a way of authenticating users on public computers through GDM, but I have a few things to be taken in account. The users do not have a login/password, they only thing they are given is a string. This string is unique and will allow us to identify them. You can see this string as a login without a password. The users must be present in a remote database The users must have the rights to login on the computer they are on at that time. A remote database would check if a booking on the computer had been set for that time by that user. Or if no booking had been made, allow to login. A default user id/home/gid has to be set to the user once logged in I have found ways to deal with most of those requirements, but not altogether. PAM looks nice to set up a custom way of checking if the user booked its computer. NSS MySQL looks nice to set up the environment. Would you know how to set up the environment by myself using a custom PAM module (using pam_python would be preferred)? Or any other method that could help me? Thanks in advance!

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  • Passenger throwing undefined method `-@' for "master":String after Puppet 3.0.0 upgrade

    - by Andy Shinn
    My Puppet master is using Passenger to serve. After upgrading to Puppet 3.0.0 I am getting the following error: [ pid=17576 thr=70231398486460 file=utils.rb:176 time=2012-10-01 17:37:12.892 ]: *** Exception NoMethodError in PhusionPassenger::Rack::ApplicationSpawner (undefined method `-@' for "master":String) (process 17576, thread #): from config.ru:7 from /usr/lib/ruby/gems/1.8/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval' from /usr/lib/ruby/gems/1.8/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize' from config.ru:1:in `new' from config.ru:1 My config.ru is as follows: # a config.ru, for use with every rack-compatible webserver. # SSL needs to be handled outside this, though. # if puppet is not in your RUBYLIB: # $LOAD_PATH.unshift('/opt/puppet/lib') $0 = "master" # if you want debugging: # ARGV << "--debug" ARGV << "--rack" # Rack applications typically don't start as root. Set --confdir to prevent # reading configuration from ~/.puppet/puppet.conf ARGV << "--confdir" << "/etc/puppet" # NOTE: it's unfortunate that we have to use the "CommandLine" class # here to launch the app, but it contains some initialization logic # (such as triggering the parsing of the config file) that is very # important. We should do something less nasty here when we've # gotten our API and settings initialization logic cleaned up. # # Also note that the "$0 = master" line up near the top here is # the magic that allows the CommandLine class to know that it's # supposed to be running master. # # --cprice 2012-05-22 require 'puppet/util/command_line' # we're usually running inside a Rack::Builder.new {} block, # therefore we need to call run *here*. run Puppet::Util::CommandLine.new.execute Any idea what may be happening?

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  • PCI configuration method error (Linux Kernel)

    - by user326580
    (I'm not sure if here is the best place for that question, so I will be pleased if anyone suggests me a more proper forum for that.) I'm trying to install Ubuntu 12.04.4 in a netbook (from an usb), but the kernel stops very early in initialization process. After two days of research, I've found that it boots with the parameter pci=conf2 but not with the default conf1 method. Nevertheless, after kernel boot, it seems that Ubuntu can't find usb devices and I'm not be able to install it. Trying with Debian, its a graphic installer and I found that the mouse isn't working neither.I think pci devices are not working. I tried about 50% of kernel pci boot options in the kernel-parameters file (in conjunction with the implicit default conf1) without luck. Any suggestions? PS: The problem is the same with kernel 2.6 or 3. (In Spanish) No estoy seguro si éste es el mejor lugar para esta pregunta, por lo cual estaré encantado si alguno me sugiere un mejor lugar para ella. Estoy intentando instalar Ubuntu 12.04.4 en una netbook (desde un usb), pero el kernel se detiene muy temprano en la inicialización. Después de dos días de investigar, encontré que arranca con el parámetro pci=conf2 pero no con método default conf1. Sin embargo después de que el kernel arranca, parece que Ubuntu no logra encontrar los dispositivos usb y no puedo instalar el sistema. Intentando con Debian y su instalador gráfico, encontré que el ratón tampoco funcionaba, así que pienso que los dispositivos pci no están funcionando. Intenté con aproximadamente el 50% de las opciones de arranque del kernel para pci (en conjunción con el método implícito conf1) sin suerte. Alguna idea? PS: El problema es el mismo con el kernel 2.6 o 3.

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  • error CS0177: The out parameter 'Wx' must be assigned to before control leaves the current method

    - by sonny5
    using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; public class Form1 : System.Windows.Forms.Form { public static float WXmin; public static float WYmin; public static float WXmax; public static float WYmax; public static int VXmin; public static int VYmin; public static int VXmax; public static int VYmax; public static float Vx; public static float Vy; public Form1() { InitializeComponent(); } private void InitializeComponent() { //this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(400, 300); this.Text="Pass Args"; this.Paint += new System.Windows.Forms.PaintEventHandler(this.doLine); } static void Main() { Application.Run(new Form1()); } private void doLine(object sender, System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(Brushes.White, this.ClientRectangle); Pen p = new Pen(Color.Black); g.DrawLine(p, 0, 0, 100, 100); p.Dispose(); } private void eachCornerPix (object sender, PaintEventArgs e, out float Wx, out float Wy, out float Vx, out float Vy) { Graphics g = this.CreateGraphics(); Pen penBlu = new Pen(Color.Blue, 2); SolidBrush redBrush = new SolidBrush(Color.Red); int width = 2; // 1 pixel wide in x int height = 2; float [] Wxc = {0.100f, 5.900f, 5.900f, 0.100f}; float [] Wyc = {0.100f, 0.100f, 3.900f, 3.900f}; for (int i = 0; i<3; i++) { Wx = Wxc[i]; Wy = Wyc[i]; Vx = ((Wx - WXmin)*((VXmax-VXmin)+VXmin)/(WXmax-WXmin)); Vy = ((Wy - WYmin)*(VYmax-VYmin)/(WYmax-WYmin)+VYmin); Console.WriteLine("eachCornerPix Vx= {0}", Vx); Console.WriteLine("eachCornerPix Vy= {0}", Vy); g.FillRectangle(redBrush, Vx, Vy, width, height); g.Dispose(); } // Desired effect: Use the array values (Wxc, Wyc) and re-assign them to Wx and Wy. Then use // Wx and Wy as components to calculate Vx and Vy. // My end goal...once compile issues are resolved, is to pass each array value listed // using this method. This should allow 4 xy point pairs to be plotted. // Errors: // pass1.cs(51,18): error CS0177: The out parameter 'Wx' must be assigned to before // control leaves the current method // pass1.cs(51,18): error CS0177: The out parameter 'Wy' must be assigned to before // control leaves the current method // pass1.cs(51,18): error CS0177: The out parameter 'Vx' must be assigned to before // control leaves the current method // pass1.cs(51,18): error CS0177: The out parameter 'Vy' must be assigned to before // control leaves the current method } }

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  • Alright, I'm still stuck on this homework problem. C++

    - by Josh
    Okay, the past few days I have been trying to get some input on my programs. Well I decided to scrap them for the most part and try again. So once again, I'm in need of help. For the first program I'm trying to fix, it needs to show the sum of SEVEN numbers. Well, I'm trying to change is so that I don't need the mem[##] = ####. I just want the user to be able to input the numbers and the program run from there and go through my switch loop. And have some kind of display..saying like the sum is?.. Here's my code so far. #include <iostream> #include <iomanip> #include <ios> using namespace std; int main() { const int READ = 10; const int WRITE = 11; const int LOAD = 20; const int STORE = 21; const int ADD = 30; const int SUBTRACT = 31; const int DIVIDE = 32; const int MULTIPLY = 33; const int BRANCH = 40; const int BRANCHNEG = 41; const int BRANCHZERO = 42; const int HALT = 43; int mem[100] = {0}; //Making it 100, since simpletron contains a 100 word mem. int operation; //taking the rest of these variables straight out of the book seeing as how they were italisized. int operand; int accum = 0; // the special register is starting at 0 int counter; for ( counter=0; counter < 100; counter++) mem[counter] = 0; // This is for part a, it will take in positive variables in //a sent-controlled loop and compute + print their sum. Variables from example in text. mem[0] = 1009; mem[1] = 1109; mem[2] = 2010; mem[3] = 2111; mem[4] = 2011; mem[5] = 3100; mem[6] = 2113; mem[7] = 1113; mem[8] = 4300; counter = 0; //Makes the variable counter start at 0. while(true) { operand = mem[ counter ]%100; // Finds the op codes from the limit on the mem (100) operation = mem[ counter ]/100; //using a switch loop to set up the loops for the cases switch ( operation ){ case READ: //reads a variable into a word from loc. Enter in -1 to exit cout <<"\n Input a positive variable: "; cin >> mem[ operand ]; counter++; break; case WRITE: // takes a word from location cout << "\n\nThe content at location " << operand << " is " << mem[operand]; counter++; break; case LOAD:// loads accum = mem[ operand ];counter++; break; case STORE: //stores mem[ operand ] = accum;counter++; break; case ADD: //adds accum += mem[operand];counter++; break; case SUBTRACT: // subtracts accum-= mem[ operand ];counter++; break; case DIVIDE: //divides accum /=(mem[ operand ]);counter++; break; case MULTIPLY: // multiplies accum*= mem [ operand ];counter++; break; case BRANCH: // Branches to location counter = operand; break; case BRANCHNEG: //branches if acc. is < 0 if (accum < 0) counter = operand; else counter++; break; case BRANCHZERO: //branches if acc = 0 if (accum == 0) counter = operand; else counter++; break; case HALT: // Program ends break; } } return 0; } part B int main() { const int READ = 10; const int WRITE = 11; const int LOAD = 20; const int STORE = 21; const int ADD = 30; const int SUBTRACT = 31; const int DIVIDE = 32; const int MULTIPLY = 33; const int BRANCH = 40; const int BRANCHNEG = 41; const int BRANCHZERO = 41; const int HALT = 43; int mem[100] = {0}; int operation; int operand; int accum = 0; int pos = 0; int j; mem[22] = 7; // loop 7 times mem[25] = 1; // increment by 1 mem[00] = 4306; mem[01] = 2303; mem[02] = 3402; mem[03] = 6410; mem[04] = 3412; mem[05] = 2111; mem[06] = 2002; mem[07] = 2312; mem[08] = 4210; mem[09] = 2109; mem[10] = 4001; mem[11] = 2015; mem[12] = 3212; mem[13] = 2116; mem[14] = 1101; mem[15] = 1116; mem[16] = 4300; j = 0; while ( true ) { operand = memory[ j ]%100; // Finds the op codes from the limit on the memory (100) operation = memory[ j ]/100; //using a switch loop to set up the loops for the cases switch ( operation ){ case 1: //reads a variable into a word from loc. Enter in -1 to exit cout <<"\n enter #: "; cin >> memory[ operand ]; break; case 2: // takes a word from location cout << "\n\nThe content at location " << operand << "is " << memory[operand]; break; case 3:// loads accum = memory[ operand ]; break; case 4: //stores memory[ operand ] = accum; break; case 5: //adds accum += mem[operand];; break; case 6: // subtracts accum-= memory[ operand ]; break; case 7: //divides accum /=(memory[ operand ]); break; case 8: // multiplies accum*= memory [ operand ]; break; case 9: // Branches to location j = operand; break; case 10: //branches if acc. is < 0 break; case 11: //branches if acc = 0 if (accum == 0) j = operand; break; case 12: // Program ends exit(0); break; } j++; } return 0; }

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  • Using proxy models

    - by smallB
    I've created Proxy model by subclassing QAbstractProxyModel and connected it as a model to my view. I also set up source model for this proxy model. Unfortunately something is wrong because I'm not getting anything displayed on my listView (it works perfectly when I have my model supplied as a model to view but when I supply this proxy model it just doesn't work). Here are some snippets from my code: #ifndef FILES_PROXY_MODEL_H #define FILES_PROXY_MODEL_H #include <QAbstractProxyModel> #include "File_List_Model.h" class File_Proxy_Model: public QAbstractProxyModel { public: explicit File_Proxy_Model(File_List_Model* source_model) { setSourceModel(source_model); } virtual QModelIndex mapFromSource(const QModelIndex & sourceIndex) const { return index(sourceIndex.row(),sourceIndex.column()); } virtual QModelIndex mapToSource(const QModelIndex & proxyIndex) const { return index(proxyIndex.row(),proxyIndex.column()); } virtual int columnCount(const QModelIndex & parent = QModelIndex()) const { return sourceModel()->columnCount(); } virtual int rowCount(const QModelIndex & parent = QModelIndex()) const { return sourceModel()->rowCount(); } virtual QModelIndex index(int row, int column, const QModelIndex & parent = QModelIndex()) const { return createIndex(row,column); } virtual QModelIndex parent(const QModelIndex & index) const { return QModelIndex(); } }; #endif // FILES_PROXY_MODEL_H //and this is a dialog class: Line_Counter::Line_Counter(QWidget *parent) : QDialog(parent), model_(new File_List_Model(this)), proxy_model_(new File_Proxy_Model(model_)), sel_model_(new QItemSelectionModel(proxy_model_,this)) { setupUi(this); setup_mvc_(); } void Line_Counter::setup_mvc_() { listView->setModel(proxy_model_); listView->setSelectionModel(sel_model_); }

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  • C++ overloading comparative operators for a MyString class

    - by Taylor Gang
    bool operator == (const MyString& left, const MyString& right) { if(left.value == right.value) return true; else return false; } bool operator != (const MyString& left, const MyString& right) { if(left == right) return false; else return true; } bool operator < (const MyString& left, const MyString& right) { if(strcmp(left.value, right.value) == -1) return true; else return false; } bool operator > (const MyString& left, const MyString& right) { if(strcmp(left.value, right.value) == 1) return true; else return false; } bool operator <= (const MyString& left, const MyString& right) { if(strcmp(left.value, right.value) == -1 || strcmp(left.value, right.value) == 0) return true; else return false; } bool operator >= (const MyString& left, const MyString& right) { if(strcmp(left.value, right.value) == 1 || strcmp(left.value, right.value) == 0) return true; else return false; } So these are my implemented comparison operators for my MyString class, they fail the test program that my professor gave me and could use some direction. Thanks in advance for any and all help I receive.

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  • Passing values for method

    - by Kasun
    I beginner for programming. So can you please show me how to pass values for your compile() method. class CL { private const string clexe = @"cl.exe"; private const string exe = "Test.exe", file = "test.cpp"; private string args; public CL(String[] args) { this.args = String.Join(" ", args); this.args += (args.Length > 0 ? " " : "") + "/Fe" + exe + " " + file; } public Boolean Compile(String content, ref string errors) { //remove any old copies if (File.Exists(exe)) File.Delete(exe); if (File.Exists(file)) File.Delete(file); File.WriteAllText(file, content); Process proc = new Process(); proc.StartInfo.UseShellExecute = false; proc.StartInfo.RedirectStandardOutput = true; proc.StartInfo.RedirectStandardError = true; proc.StartInfo.FileName = clexe; proc.StartInfo.Arguments = this.args; proc.StartInfo.CreateNoWindow = true; proc.Start(); //errors += proc.StandardError.ReadToEnd(); errors += proc.StandardOutput.ReadToEnd(); proc.WaitForExit(); bool success = File.Exists(exe); return success; } }

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  • String.split() method bug in GWT 2.0.3

    - by Domchi
    I'm upgrading a GWT project from GWT 1.7.1 to currently newest version 2.0.3. It seems that new GWT broke String.split(String regex) method - I get the following error on the Javascript side: this$static is undefined This happens in this line of my .nocache.js file: if (maxMatch == 0 && this$static.length > 0) { ...which happens to be a part of String split method equivalent in Javascript. Is there a cure for this, apart from doing string splitting myself?

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  • NSThread with class method?

    - by Jeroen Sterckx
    Is it possible to run a class method (starting with a '+') in a separate thread? Normally I call the method like [myClass myController]; I tried [NSThread detachNewThreadSelector:myController toTarget:myClass withObject:nil]; without success.

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  • Why use Monte-Carlo method?

    - by Gili
    When should the Monte-Carlo method be used? For example, why did Joel decide to use the Monte-Carlo method for Evidence Based Scheduling instead of methodically processing all user data for the past year?

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  • How to use the callback method with a c++ directshow sample grabber

    - by Mr Bell
    I have a sample grabber hooked into my directshow graph, based on this example http://msdn.microsoft.com/en-us/library/dd407288(VS.85).aspx the problem is that it uses one shot and buffers. I want to continuously grab samples, and i'd rather have a callback than i guess polling for the samples. How do use the SetCallback method? SetCallback(ISampleGrabberCB *pCallback, long WhichMethodToCallback) how do I point pCallback to my own method?

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  • XAML ComboBox Bind to Method

    - by griegs
    If I have a method in my C#; public CollectionView Months { get { CollectionView retList = new Enumerations.Months().ToCollectionView<Enumerations.Months>(); return retList; } } And I have a ComboBox; <ComboBox x:Name="ddlMonth" Grid.Row="3" Grid.Column="1" ItemsSource="{Binding Source={StaticResource Months}}"/> How can I bind my ComboBox to my method? I should add I'm a complete xaml newbie.

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  • Trying to change variables in a singleton using a method

    - by Johnny Cox
    I am trying to use a singleton to store variables that will be used across multiple view controllers. I need to be able to get the variables and also set them. How do I call a method in a singleton to change the variables stored in the singleton. total+=1079; [var setTotal:total]; where var is a static Singleton *var = nil; I need to update the total and send to the setTotal method inside the singleton. But when I do this the setTotal method never gets accessed. The get methods work but the setTotal method does not. Please let me know what should. Below is some of my source code // // Singleton.m // Rolo // // Created by on 6/28/12. // Copyright (c) 2012 Johnny Cox. All rights reserved. // #import "Singleton.h" @implementation Singleton @synthesize total,tax,final; #pragma mark Singleton Methods + (Singleton *)sharedManager { static Singleton *sharedInstance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sharedInstance = [[Singleton alloc] init]; // Do any other initialisation stuff here }); return sharedInstance; } +(void) setTotal:(double) tot { Singleton *shared = [Singleton sharedManager]; shared.total = tot; NSLog(@"hello"); } +(double) getTotal { Singleton *shared = [Singleton sharedManager]; NSLog(@"%f",shared.total); return shared.total; } +(double) getTax { Singleton *shared = [Singleton sharedManager]; NSLog(@"%f",shared.tax); return shared.tax; } @end // // Singleton.h // Rolo // // Created by on 6/28/12. // Copyright (c) 2012 Johnny Cox. All rights reserved. // #import <Foundation/Foundation.h> @interface Singleton : NSObject @property (nonatomic, assign) double total; @property (nonatomic, assign) double tax; @property (nonatomic, assign) double final; + (id)sharedManager; +(double) getTotal; +(void) setTotal; +(double) getTax; @end

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  • Static property references non-static method

    - by rhj4
    How can a static property reference a nonstatic method? Example: public static int UserID { get { return GetUserID(); } } private int GetUserID() { return 1; } When I try to compile this, I get the error: "An object reference is required for he non-static field, method or property "GetUserID()"

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  • Upper extension method in linq to NHibernate

    - by Daniel
    I would like to use the Upper extension method which is declared on the IDbMethods interface against Sql Server 2008. I understand that this will translate to UPPER() on sql server. However I can not figure out how to get an implementation of IDbMethods so that I can use the extension method.

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  • Calling a static method on a generic type parameter

    - by Remi Despres-Smyth
    I was hoping to do something like this, but it appears to be illegal in C#: public Collection MethodThatFetchesSomething<T>() where T : SomeBaseClass { return T.StaticMethodOnSomeBaseClassThatReturnsCollection(); } I get a compile-time error: "'T' is a 'type parameter', which is not valid in the given context." Given a generic type parameter, how can I call a static method on the generic class? The static method has to be available, given the constraint.

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  • Mock static method Activator.CreateInstance to return a mock of another class

    - by Jeep87c
    I have this factory class and I want to test it correctly. Let's say I have an abstract class which have many child (inheritance). As you can see in my Factory class the method BuildChild, I want to be able to create an instance of a child class at Runtime. I must be able to create this instance during Runtime because the type won't be know before runtime. And, I can NOT use Unity for this project (if so, I would not ask how to achieve this). Here's my Factory class that I want to test: public class Factory { public AnAbstractClass BuildChild(Type childType, object parameter) { AnAbstractClass child = (AnAbstractClass) Activator.CreateInstance(childType); child.Initialize(parameter); return child; } } To test this, I want to find a way to Mock Activator.CreateInstance to return my own mocked object of a child class. How can I achieve this? Or maybe if you have a better way to do this without using Activator.CreateInstance (and Unity), I'm opened to it if it's easier to test and mock! I'm currently using Moq to create my mocks but since Activator.CreateInstance is a static method from a static class, I can't figure out how to do this (I already know that Moq can only create mock instances of objects). I took a look at Fakes from Microsoft but without success (I had some difficulties to understand how it works and to find some well explained examples). Please help me! EDIT: I need to mock Activator.CreateInstance because I want to force this method to return another mocked object. The correct thing I want is only to stub this method (not to mock it). So when I test BuildChild like this: [TestMethod] public void TestBuildChild() { var mockChildClass = new Mock(AChildClass); // TODO: Stub/Mock Activator.CreateInstance to return mockChildClass when called with "type" and "parameter" as follow. var type = typeof(AChildClass); var parameter = "A parameter"; var child = this._factory.BuildChild(type, parameters); } Activator.CreateInstance called with type and parameter will return my mocked object instead of creating a new instance of the real child class (not yet implemented).

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