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  • Singleton with eager initialization

    - by jesper
    I have class X that takes much time to initialize itself. I want to make that class singleton and force its creation when rails application starts. I've made the singleton: class X @@instance = nil def self.instance if @@instance.nil? @@instance = X.new puts 'CREATING' end return @@instance end private_class_method :new end The problem is that every time I use this class I see 'CREATING' in logs. I've tried to put creation of class in initializers directory but it doesn't work either.

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  • What to return as an iterator when there is no container?

    - by DaClown
    I have an inheritance structure of objects with begin() and end() as pure virtual member functions in the base class. From this objects I'm planning to build a composite structure. This inner objects have std::vector member the begin() and end() get their data from. But in a leaf class there is no vector. Now I try to find a return value for begin() and end() in the leaf classes. What would be a good way to do that? The easiest way would be to have a vector member in the leaf classes with no elements in it to fuel begin() and end(), but this just doesn't feel right.

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  • hosting a high traffic facebook app (game)

    - by z3cko
    we are currently developing a high traffic facebook application. all the traffic will be within one month, where there are 500.000 to 1.000.000 expected users. after that month, the game is over and we have a winner - so the app will be archived. we are currently planning to develop the application with ruby on rails and searching for hosting options that can deal with the traffic. the problem is not so much the users, but the peak values: we will have around 500.000 requests coming daily within a short timeframe (lets say within 3 minutes in the worst case) we are expecting 500.000 to 1.000.000 users of the application, with peaks at 1:00pm (timezone GMT+1), where most (up to 80% of the users) will send most of the requests. the requests are from 11th of june to 11.july - after that, the app/game is closed/over. we are currently developing an aggressive caching mechanism - currently we are thinking about 2 or 3 small apps/webservices, that will handle the load. the load is distributed as follows: a) main application, cached data (11 screens, 200k each) b) voting: every day until 1:00pm (timezone GMT+1) - every user votes with about 10k data sent, high concurrent peak values! questions: is there any specific application setup that is recommendable? are there any hosting partners that can be recommended? thanks!

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  • How do I gain permissions to a Sql Compact Database?

    - by Quenton Jones
    I have an Sql Compact Database v3.5 that I'm bundling with my application. When the application is installed, the database is copied into the application's Program Files directory. Because of Vista and Win7's security settings, the installed application can't access the database file. It is merely a problem of having the database file reside in the Program Files. The solution I have thought of is to copy the file into Program Data, but does anyone have another solution? I am sure others have come across a similar problem. Thanks in advance for your input.

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  • windows form applications' cut copy paste functionality

    - by Muhammad Adnan
    I have windows forms application with multiple forms and controls in them. I want if user has selected some text in any control of any form of my application and click on cut/copy/paste button on toolbar operation get performed accordingly. i m using C#.net's sendkeys.send("^c") on click of copy button but it doesn't work... OR any 1 can tell if is there any way to get selected text (despite of knowing, which form/control of my application). Thanks in advance...

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  • Creating an Expando object in Ruby

    - by tyndall
    Is there a better way to write this Expando class? The way it is written does not work. I'm using Ruby 1.8.7 starting code quoted from https://gist.github.com/300462/3fdf51800768f2c7089a53726384350c890bc7c3 class Expando def method_missing(method_id, *arguments) if match = method_id.id2name.match(/(\w*)(\s*)(=)(\s*)(\.*)/) puts match[1].to_sym # think this was supposed to be commented self.class.class_eval{ attr_accessor match[1].to_sym } instance_variable_set("#{match[1]}", match[5]) else super.method_missing(method_id, *arguments) end end end person = Expando.new person.name = "Michael" person.surname = "Erasmus" person.age = 29

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  • Optional parens in Ruby for method with uppercase start letter?

    - by RasmusKL
    I just started out using IronRuby (but the behaviour seems consistent when I tested it in plain Ruby) for a DSL in my .NET application - and as part of this I'm defining methods to be called from the DSL via define_method. However, I've run into an issue regarding optional parens when calling methods starting with an uppercase letter. Given the following program: class DemoClass define_method :test do puts "output from test" end define_method :Test do puts "output from Test" end def run puts "Calling 'test'" test() puts "Calling 'test'" test puts "Calling 'Test()'" Test() puts "Calling 'Test'" Test end end demo = DemoClass.new demo.run Running this code in a console (using plain ruby) yields the following output: ruby .\test.rb Calling 'test' output from test Calling 'test' output from test Calling 'Test()' output from Test Calling 'Test' ./test.rb:13:in `run': uninitialized constant DemoClass::Test (NameError) from ./test.rb:19:in `<main>' I realize that the Ruby convention is that constants start with an uppercase letter and that the general naming convention for methods in Ruby is lowercase. But the parens are really killing my DSL syntax at the moment. Is there any way around this issue?

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  • MVVM Tutorial/Example Code with internet connectivity

    - by SpikeX
    I understand the View and ViewModel portions of MVVM, but what I'm still really fuzzy on is how you connect your application to data sources on the Internet (say you're grabbing some XML or JSON from the web), and specifically, where that code goes in your application. Can someone provide or link to some example code or a tutorial that walks you through setting up a simple WPF (or Silverlight) application that fetches data from the Web?

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  • Session State Anti-Pattern

    - by Curiosity
    I know the SOLID principles and other design patterns fairly well and have been programming for some time now - seeing many a bit of code throughout the years. Having said that, I'm having trouble coming up with a name to give the pattern, or lack thereof, to bits of code I've been dealing with at a current engagement. The application is an ASP.NET C# WebForms application, backed by a SQL Server/Mainframe backend (more mainframe than backend) and it's riddled with Session State properties being accessed/mutated from multiple pages/classes. Accessing/mutating global variables/application state was usually shunned upon while I was in school. Apparently the creators of this magnificent application didn't think it was such a bad idea. Question: Is there a name for such a pattern/anti-pattern that relies so heavily on Session State? I'd like to call the pig by its name ...

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  • iPhone - extending a class delegate

    - by Digital Robot
    OK, I know how to create a class extension, using something like that: on .h @interface UIButton (myExtensionName) // my extended methods @end and then on .m @implementation UIButton (myExtensionName) // my implementations @end But how do I declare the extended delegates I may create? If this was a normal class I would do @protocol myExtensionName <NSObject> // my delegate declarations @end but how do I do that on a class extension? thanks

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  • Controller not accepting params value but the same value hard coded is accepted

    - by Numbers
    Rails.logger.info(params[:question]) => {"title"=>"katt"} @question_list.questions.create(params[:question]) => ActiveModel::ForbiddenAttributesError (ActiveModel::ForbiddenAttributesError) @question_list.questions.create("title"=>"katt") # SUCCES! I cannot understand why Rails not accepts the params when the exact same value written by hand works fine? Update controller: def new_question @question_list.questions.create(params[:question]) render nothing: true end private def set_question_list @question_list = QuestionList.find(params[:id]) end def question_list_params params.require(:question_list).permit(questions_attributes: [:id, :question_list_id, :title, :position, :_destroy]) end view: <%= form_for @question_list, url: new_question_question_list_path, remote: true do |f| %> <%= f.text_field :title %> <%= f.submit %> <% end %>

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  • How Do you Declare a Dependancy Property in VB.Net 3.0

    - by discwiz
    My company is stuck on .Net 3.0. The task I am trying to tackle is simple, I need to bind the IsChecked property of the CheckBoxResolvesCEDAR to the CompletesCEDARWork in my Audio class. The more I read about this it appears that I have to declare CompletesCEDARWork as dependancy propert, but I can not find a good example of how this is done. I found this example, but when I pasted into my code I get an "is not defined" error for GetValue and I have not successfully figure out what MyCode is supposed to represent. Any help/examples would be greatly appreciated. Thanks Public Shared ReadOnly IsSpinningProperty As DependencyProperty = DependencyProperty.Register("IsSpinning", GetType(Boolean), GetType(MyCode)) Public Property IsSpinning() As Boolean Get Return CBool(GetValue(IsSpinningProperty)) End Get Set(ByVal value As Boolean) SetValue(IsSpinningProperty, value) End Set End Property Here is my slimed down Audio Class as it stands now. Imports System.Xml Imports System Imports System.IO Imports System.Collections.ObjectModel Imports System.ComponentModel Public Class Audio Private mXMLString As String Private mTarpID As Integer Private mStartTime As Date Private mEndTime As Date Private mAudioArray As Byte() Private mFileXMLInfo As IO.FileInfo Private mFileXMLStream As IO.FileStream Private mFileAudioInfo As IO.FileInfo Private mDisplayText As String Private mCompletesCEDARWork As Boolean Private Property CompletesCEDARWork() As Boolean Get Return mCompletesCEDARWork End Get Set(ByVal value As Boolean) mCompletesCEDARWork = value End Set End Property And here is my XML Datatemplate where I set the binding. <DataTemplate x:Key="UploadLayout" DataType="Audio"> <Border BorderBrush="LightGray" CornerRadius="8" BorderThickness="1" Padding="10" Margin="0,3,0,0"> <StackPanel Orientation="Vertical"> <TextBlock Text="{Binding Path=DisplayText}"> </TextBlock> <StackPanel Orientation="Horizontal" VerticalAlignment="Center"> <TextBlock Text="TARP ID" VerticalAlignment="Center"/> <ComboBox x:Name="ListBoxTarpIDs" ItemsSource="{Binding Path=TarpIds}" SelectedValue="{Binding Path=TarpID}" BorderBrush="Transparent" Background="Transparent" > </ComboBox> </StackPanel> <CheckBox x:Name="CheckBoxResolvesCEDAR" Content="Resolves CEDAR Work" IsChecked="{Binding ElementName=Audio,Path=CompletesCEDARWork,Mode=TwoWay}"/> </StackPanel> </Border> </DataTemplate>

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  • How to override the attr_protected?

    - by KandadaBoggu
    I have STI implementation as follows: class Automobile < ActiveRecord::Base end class Car < Automobile end class Truck < Automobile end class User < ActiveRecord::Base has_many :automobiles accepts_nested_attributes_for :automobiles end I am creating a list of automobiles for a user. For each automobile, the UI sets the type field and the properties associated with the automobile.While form submission, the type field is ignored as it is a protected attribute. How do I work around this issue? Is there a declarative way to unprotect a protected attribute?

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  • How to display buttons after enterframe event is over in Corona?

    - by user1463542
    I am trying to display two buttons called countd_again and main_menu after my enterframe event is over. I can't see those buttons after enterframe event is over,though. Can you check my code,please? And also i want to add new addListener for the buttons using director and scene. module(..., package.seeall) function new() local localGroup = display.newGroup(); display.setStatusBar(display.HiddenStatusBar) local background = display.newImage("background.png") start=os.time() cnt=1 local countd_again = display.newImage("yeniden.png") countd_again.x=100 countd_again.y=100 countd_again.isVisible= false; countd_again.alpha=0; countd_again.scene="helloWorld"; local main_menu= display.newImage("anamenu.png") main_menu.x=100 main_menu.y=300 main_menu.isVisible=false; main_menu.alpha=0; main_menu.scene="helloWorld" -- listener function local function onEveryFrame( event ) if (cnt~=0) then cnt= 3-(os.time()-start) minute = math.floor(cnt/60) second=cnt%60 --print(minute,second) minTxt=display.newText(minute,50,50,nil,100) secTxt=display.newText(second,250,50,nil,100) transition.to(minTxt, {time=100, alpha=0}) transition.to(secTxt,{time=100, alpha=0}) else Runtime: removeEventListener("enterFrame",onEveryFrame) countd_again.isVisible=true; main_menu.isVisible=true; transition.to(countd_again,{time=500,alpha=1}); transition.to(main_menu,{time=500,alpha=1}); countd_again: addEventListener("touch", changeScene) main_menu: addEventListener("touch", changeScene) end end -- assign the above function as an "enterFrame" listener Runtime:addEventListener( "enterFrame", onEveryFrame ) function changeScene(e) if(e.phase=="ended") then director:changeScene(e.target.scene); end end countd_again: addEventListener("touch", changeScene) main_menu: addEventListener("touch", changeScene) localGroup: insert(countd_again) localGroup:insert(main_menu) localGroup:insert(background) return localGroup; end

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  • Deploying symfony without shell access

    - by lacqui
    Good day, I have an application written using the Symfony framework. The application works on my development server, where I have shell access. However, I am unable to load my application on my host, as I need to run symfony doctrine::build on the command line on the host. Is there another way to load the database after or during symfony project:deploy?

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  • Automatically create valid links

    - by Marcos Placona
    Hi, I'm new to python, so please bare with me :) I was wondering if there's any built-in way in python to append variables to URL's regardless of it's structure. I would like to have a URL variable (test=1) added to an URL which could have any of the following structures http://www.aaa.com (would simply add "/?test=1") to the end http://www.aaa.com/home (like the one above, would simply add "/?test=1") to the end http://www.aaa.com/?location=home (would figure out there's already a ? being used, and would add &test=1 to the end) http://www.aaa.com/?location=home&page=1 (like the one above, would figure out there's already a ? being used, and would add &test=1 to the end) I'd be happy to write domething to do it myself, but if python can already do it somehow, I'd me more than happy to use any built-in functionality that would save me some time ;-) Thanks in advance

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  • Socket Communication C#- IP Address

    - by Ahmet Altun
    I have a socket application which I can use in local network, at home. I can make them communicate for example from 192.168.x.x to 192.168.y.y ip addresses. What should I do if I want to use the application over internet, from a remote machine, not local. For example which ip addresses should I use if my friend who lives another country wants to access my application.

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  • UIWebView - remote html loading local images

    - by AragornSG
    I'm trying to develop an application using UIWebView. The app is loading remote URL's, so in order to make it quick I want it to use the images included in the application bundle. I was wondering if there is a way to do it without forcing the application to manually replace the address of each image to point into local resources?

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  • Excel Worksheet Index

    - by Ben
    I have the following code that works great but I am trying to modify it so that instead of replacing column 1 of the Index page with a new index I would rather start the range in Cell C11. Right now, the new Index starts in Cell A1 of the Index sheet. Here is the code: Private Sub Worksheet_Activate() Dim wSheet As Worksheet Dim l As Long l = 1 With Me .Columns(1).ClearContents .Cells(1, 1) = "INDEX" .Cells(1, 1).Name = "Index" End With For Each wSheet In Worksheets If wSheet.Name <> Me.Name Then l = l + 1 With wSheet .Range("A1").Name = "Start_" & wSheet.Index .Hyperlinks.Add Anchor:=.Range("A1"), Address:="", _ SubAddress:="Index", TextToDisplay:="Back to Index" End With Me.Hyperlinks.Add Anchor:=Me.Cells(l, 1), Address:="", _ SubAddress:="Start_" & wSheet.Index, TextToDisplay:=wSheet.Name End If Next wSheet End Sub I have successfully modified the code so that the link back to the index on each sheet is in cell A4 without trouble, but I can't figure out how to have the index be replaced starting at Cell C11

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  • Trouble Upgrading Rails 2 Routes for a Redmine Plugin

    - by user1858628
    I am trying to get a Redmine plugin designed for Rails 2 to work with Rails 3. https://github.com/dalyons/redmine-todos-scrum-plugin I've pretty much fixed most parts, but having no success whatsoever in getting the routes to work. The original routes for Rails 2 are as follows: map.resources :todos, :name_prefix => 'project_', :path_prefix => '/projects/:project_id', :member => {:toggle_complete => :post }, :collection => {:sort => :post} map.resources :todos, :name_prefix => 'user_', :path_prefix => '/users/:user_id', :controller => :mytodos, :member => {:toggle_complete => :post }, :collection => {:sort => :post} map.my_todos 'my/todos', :controller => :mytodos, :action => :index map.connect 'projects/:project_id/todos/show/:id', :controller => "todos", :action => "show" rake routes outputs the following: sort_project_todos POST /projects/:project_id/todos/sort(.:format) {:controller=>"todos", :action=>"sort"} project_todos GET /projects/:project_id/todos(.:format) {:controller=>"todos", :action=>"index"} POST /projects/:project_id/todos(.:format) {:controller=>"todos", :action=>"create"} new_project_todo GET /projects/:project_id/todos/new(.:format) {:controller=>"todos", :action=>"new"} toggle_complete_project_todo POST /projects/:project_id/todos/:id/toggle_complete(.:format) {:controller=>"todos", :action=>"toggle_complete"} edit_project_todo GET /projects/:project_id/todos/:id/edit(.:format) {:controller=>"todos", :action=>"edit"} project_todo GET /projects/:project_id/todos/:id(.:format) {:controller=>"todos", :action=>"show"} PUT /projects/:project_id/todos/:id(.:format) {:controller=>"todos", :action=>"update"} DELETE /projects/:project_id/todos/:id(.:format) {:controller=>"todos", :action=>"destroy"} sort_user_todos POST /users/:user_id/todos/sort(.:format) {:controller=>"mytodos", :action=>"sort"} user_todos GET /users/:user_id/todos(.:format) {:controller=>"mytodos", :action=>"index"} POST /users/:user_id/todos(.:format) {:controller=>"mytodos", :action=>"create"} new_user_todo GET /users/:user_id/todos/new(.:format) {:controller=>"mytodos", :action=>"new"} toggle_complete_user_todo POST /users/:user_id/todos/:id/toggle_complete(.:format) {:controller=>"mytodos", :action=>"toggle_complete"} edit_user_todo GET /users/:user_id/todos/:id/edit(.:format) {:controller=>"mytodos", :action=>"edit"} user_todo GET /users/:user_id/todos/:id(.:format) {:controller=>"mytodos", :action=>"show"} PUT /users/:user_id/todos/:id(.:format) {:controller=>"mytodos", :action=>"update"} DELETE /users/:user_id/todos/:id(.:format) {:controller=>"mytodos", :action=>"destroy"} my_todos /my/todos {:controller=>"mytodos", :action=>"index"} /projects/:project_id/todos/show/:id {:controller=>"todos", :action=>"show"} The nearest I have got for Rails 3 is follows: scope '/projects/:project_id', :name_prefix => 'project_' do resources :todos, :controller => 'todos' do member do post :toggle_complete end collection do post :sort end end end scope '/users/:user_id', :name_prefix => 'user_' do resources :todos, :controller => 'mytodos' do member do post :toggle_complete end collection do post :sort end end end match 'my/todos' => 'mytodos#index', :as => :my_todos match 'projects/:project_id/todos/show/:id' => 'todos#show' rake routes outputs the following: toggle_complete_todo POST /projects/:project_id/todos/:id/toggle_complete(.:format) todos#toggle_complete {:name_prefix=>"project_"} sort_todos POST /projects/:project_id/todos/sort(.:format) todos#sort {:name_prefix=>"project_"} todos GET /projects/:project_id/todos(.:format) todos#index {:name_prefix=>"project_"} POST /projects/:project_id/todos(.:format) todos#create {:name_prefix=>"project_"} new_todo GET /projects/:project_id/todos/new(.:format) todos#new {:name_prefix=>"project_"} edit_todo GET /projects/:project_id/todos/:id/edit(.:format) todos#edit {:name_prefix=>"project_"} todo GET /projects/:project_id/todos/:id(.:format) todos#show {:name_prefix=>"project_"} PUT /projects/:project_id/todos/:id(.:format) todos#update {:name_prefix=>"project_"} DELETE /projects/:project_id/todos/:id(.:format) todos#destroy {:name_prefix=>"project_"} POST /users/:user_id/todos/:id/toggle_complete(.:format) mytodos#toggle_complete {:name_prefix=>"user_"} POST /users/:user_id/todos/sort(.:format) mytodos#sort {:name_prefix=>"user_"} GET /users/:user_id/todos(.:format) mytodos#index {:name_prefix=>"user_"} POST /users/:user_id/todos(.:format) mytodos#create {:name_prefix=>"user_"} GET /users/:user_id/todos/new(.:format) mytodos#new {:name_prefix=>"user_"} GET /users/:user_id/todos/:id/edit(.:format) mytodos#edit {:name_prefix=>"user_"} GET /users/:user_id/todos/:id(.:format) mytodos#show {:name_prefix=>"user_"} PUT /users/:user_id/todos/:id(.:format) mytodos#update {:name_prefix=>"user_"} DELETE /users/:user_id/todos/:id(.:format) mytodos#destroy {:name_prefix=>"user_"} my_todos /my/todos(.:format) mytodos#index /projects/:project_id/todos/show/:id(.:format) todos#show I am guessing that I am not using :name_prefix correctly, resulting in duplicate paths which are then omitted. Any help would be greatly appreciated.

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  • Kohana 3 Auto loading Models

    - by pigfox
    I'm attempting to use a Model but I get a fatal error so I assume it doesn't autoload properly. ErrorException [ Fatal Error ]: Class 'Properties_Model' not found The offending controller line: $properties = new Properties_Model; The model: class Properties_Model extends Model { public function _construct() { parent::_construct(); } } I also put the class in three different locations hoping one would work, all there failed. They are: application/classes/model application/model application/models What am I missing?

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  • In Rails, how do you functional test a Javascript response format?

    - by Teflon Ted
    If your controller action looks like this: respond_to do |format| format.html { raise 'Unsupported' } format.js # index.js.erb end and your functional test looks like this: test "javascript response..." do get :index end it will execute the HTML branch of the respond_to block. If you try this: test "javascript response..." do get 'index.js' end it executes the view (index.js.erb) withOUT running the controller action!

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  • visual studio 2008 (VB)

    - by Ousman
    hello guys, Am writing a programming with visual basic 2008 and i want the programme to be able to read and loop through a text file line by line and showing the event of the loop on a textbox or label until a button is press and the loop will stop on any number that happend to be at the loop event and when a button is press again the loop will continue from where it starts. this is my codes below and having problem with it and any help will be really great. tanks ==========================my codes======================= Imports System.IO '========================================================================================== Public Class Form1 '====================================================================================== 'Dim nFileNum As Integer = FreeFile() ' Get a free file number Dim strFileName As String = "C:\scb.txt" Dim objFilename As FileStream = New FileStream(strFileName, FileMode.Open, FileAccess.Read, FileShare.Read) Dim objFileRead As StreamReader = New StreamReader(objFilename) 'Dim lLineCount As Long 'Dim sNextLine As String '====================================================================================== '======================================================================================== Private Sub btStart_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btStart.Click Try If objFileRead.ReadLine = Nothing Then MsgBox("No Accounts Available to show!", MsgBoxStyle.Information, MsgBoxStyle.DefaultButton2 = MsgBoxStyle.OkOnly) Return Else Do While (objFileRead.Peek() > -1) Loop lblAccounts.Text = objFileRead.ReadLine() 'objFileRead.Close() 'objFilename.Close() End If Catch ex As Exception MessageBox.Show(ex.Message) Finally 'objFileRead.Close() 'objFilename.Close() End Try End Sub Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load End Sub End Class

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