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• Latex renewcommand not working properly

  - by Nazgulled

  Why is this not working: \documentclass[a4paper,10pt]{article} \usepackage{a4wide} \usepackage[T1]{fontenc} \usepackage[portuguese]{babel} \usepackage[latin1]{inputenc} \usepackage{indentfirst} \usepackage{listings} \usepackage{fancyhdr} \usepackage{url} \usepackage[compat2,a4paper,left=25mm,right=25mm,bottom=15mm,top=20mm]{geometry} \usepackage{color} \usepackage[colorlinks]{hyperref} \usepackage[pdftex]{graphicx} \renewcommand{\headrulewidth}{0.4pt} \renewcommand{\footrulewidth}{0.4pt} \pagestyle{fancy} \fancyhead[L]{\small Laboratórios de Informática III} \fancyhead[R]{\small Projecto 1 (Linguagem \textsf{C})} \lstset{ basicstyle=\ttfamily\footnotesize, showstringspaces=false, frame=single, tabsize=4, breaklines=true, } \definecolor{Section1}{rgb}{0.09,0.21,0.36} \definecolor{Section2}{rgb}{0.21,0.37,0.56} \definecolor{Section3}{rgb}{0.30,0.50,0.74} \hypersetup{ bookmarks=false, linkcolor=red, urlcolor=cyan, } \renewcommand{\section}[1]{\texorpdfstring{\color{green}#1}{#1}} \parskip=6pt \begin{document} \begin{titlepage} \begin{center} \includegraphics[width=5cm]{./logo.jpg}\\[1cm] \textsc{\LARGE Universidade do Minho}\\[1cm] \textsc{\large Licenciatura em Engenharia Informática\\Laboratórios de Informática III}\\[1.5cm] \rule{\linewidth}{0.5mm}\\[0.4cm] \huge{\textbf{\textsc{Relatório do Projecto 1 (Linguagem C)}}} \rule{\linewidth}{0.5mm} \vfill \begin{tabular}{c c} \includegraphics[width=3.5cm]{./nuno.jpg} & \includegraphics[width=3.5cm]{./ricardo.jpg} \\ \textsc{\large{Nuno Mendes (51161)}} & \textsc{\large{Ricardo Amaral (48404)}} \\ \end{tabular} \vfill \large{\today} \end{center} \end{titlepage} \tableofcontents \newpage \section{Introdução} Lorem ipsum... \newpage \appendix \section{\color{Section1}Diagrama das Estruturas de Dados} \begin{center} \includegraphics[width=16cm]{./Diagrama.pdf} \end{center} \end{document} ! LaTeX Error: Something's wrong--perhaps a missing \item. See the LaTeX manual or LaTeX Companion for explanation. Type H for immediate help. ... l.2 ...rline {1}\color {green}Teste}{3}{section.1} How can I make it work properly?

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• Silverlight 4 DataBinding: Binding to ObservableCollection<string> not working anymore

  - by Kurt

  Upgrading from SL3 - SL4. First problem: this throws a parser exception: <StackPanel Name={Binding} /> (same with x:Name) Collection is ObservableCollection<string>. Worked fine in SL3. So it seems that SL4 doen't allow binding to the Name property. Huh? So: changed to <StackPanel Tag={Binding} /> ... since I just need to ID the control in code behind. So here's the bug ('cuz this has got to be a bug!): In this frag, AllAvailableItems is an ObservableCollection<string>: <ItemsControl Name="lbItems" ItemsSource="{Binding AllAvailableItems}" Height="Auto" Width="Auto" BorderBrush="Transparent" BorderThickness="0" VerticalAlignment="Top" HorizontalAlignment="Left" Margin="12,6,0,0"> <ItemsControl.ItemTemplate> <DataTemplate> <Grid> <Grid.RowDefinitions> <RowDefinition /> <RowDefinition /> </Grid.RowDefinitions> <CheckBox Tag="{Binding}" Checked="ItemChecked_Click" Unchecked="ItemUnchecked_Click" Style="{StaticResource CheckBoxStyle}" Grid.Row="0"> <CheckBox.Content> <TextBlock Text="{Binding}" Style="{StaticResource FormLJustStyle}" /> </CheckBox.Content> </CheckBox> <StackPanel Tag="{Binding}" Orientation="Vertical" Grid.Row="1"> <configControls:ucLanguage /> <!-- simple user control --> </StackPanel> </Grid> </DataTemplate> </ItemsControl.ItemTemplate> </ItemsControl> In the code behind, I use a recursive function to find the Dependency object with either the Name or Tag property provided: public static T FindVisualChildByName<T>(DependencyObject parent, string name, DependencyProperty propToUse) where T : DependencyObject { for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++) { var child = VisualTreeHelper.GetChild(parent, i); string controlName = child.GetValue(propToUse) as string; if (controlName == name) { return child as T; } else { T result = FindVisualChildByName<T>(child, name, propToUse); if (result != null) return result; } } return null; } OK, get this: in the code behind, I can get the control that is ORDERED FIRST in the XAML! In other words, if I put the CheckBox first, I can retrieve the CheckBox, but no StackPanel. And vice-versa. This all worked fine in SL3. Any help, ideas ... ? Thanks - Kurt

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• Create signed urls for CloudFront with Ruby

  - by wiseleyb

  History: I created a key and pem file on Amazon. I created a private bucket I created a public distribution and used origin id to connect to the private bucket: works I created a private distribution and connected it the same as #3 - now I get access denied: expected I'm having a really hard time generating a url that will work. I've been trying to follow the directions described here: http://docs.amazonwebservices.com/AmazonCloudFront/latest/DeveloperGuide/index.html?PrivateContent.html This is what I've got so far... doesn't work though - still getting access denied: def url_safe(s) s.gsub('+','-').gsub('=','_').gsub('/','~').gsub(/\n/,'').gsub(' ','') end def policy_for_resource(resource, expires = Time.now + 1.hour) %({"Statement":[{"Resource":"#{resource}","Condition":{"DateLessThan":{"AWS:EpochTime":#{expires.to_i}}}}]}) end def signature_for_resource(resource, key_id, private_key_file_name, expires = Time.now + 1.hour) policy = url_safe(policy_for_resource(resource, expires)) key = OpenSSL::PKey::RSA.new(File.readlines(private_key_file_name).join("")) url_safe(Base64.encode64(key.sign(OpenSSL::Digest::SHA1.new, (policy)))) end def expiring_url_for_private_resource(resource, key_id, private_key_file_name, expires = Time.now + 1.hour) sig = signature_for_resource(resource, key_id, private_key_file_name, expires) "#{resource}?Expires=#{expires.to_i}&Signature=#{sig}&Key-Pair-Id=#{key_id}" end resource = "http://d27ss180g8tp83.cloudfront.net/iwantu.jpeg" key_id = "APKAIS6OBYQ253QOURZA" pk_file = "doc/pk-APKAIS6OBYQ253QOURZA.pem" puts expiring_url_for_private_resource(resource, key_id, pk_file) Can anyone tell me what I'm doing wrong here?

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• Access current_user in model

  - by LearnRails

  I have 3 tables items (columns are: name , type) history(columns are: date, username, item_id) user(username, password) When a user say "ABC" logs in and creates a new item, a history record gets created with the following after_create filter. How to assign this username ‘ABC’ to the username field in history table through this filter. class Item < ActiveRecord::Base has_many :histories after_create :update_history def update_history histories.create(:date=Time.now, username= ?) end My login method in session_controller def login if request.post? user=User.authenticate(params[:username]) if user session[:user_id] =user.id redirect_to( :action='home') flash[:message] = "Successfully logged in " else flash[:notice] = "Incorrect user/password combination" redirect_to(:action="login") end end end I am not using any authentication plugin. I would appreciate if someone could tell me how to achieve this without using plugin(like userstamp etc.) if possible.

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• Informational messages returned with WCF involved

  - by DT

  This question is about “informational messages” and having them flow from a “back end” to a “front end” in a consistent manner. The quick question is “how do you do it”? Background: Web application using WCF to call back end services. In the back end service a “message” may occur. Now, the reason for this “message” may be a number of reasons, but for this discussion let’s assume that a piece of data was looked at and it was determined that the caller should be given back some information regarding it. This “informational” message may occur during a save and also may occur during retrieval of information. Again, the message is not what is important here, but the fact that there is some informational messages to give back under a number of different scenarios. From a team perspective we all want to return these “messages” in a standard way all of the time. Now, in the past this “standard way” has been done different ways by different people. Here are some possibilities: 1) Every operation has a “ref” parameter at the end that contains these messages 2) Every method returns these messages… however, this only kind of works for “Save” methods as one would think that “Retrieve” methods should return actual data and not messages 3) Some approach using the call context so as to not "pollute" all message signatures with something; however, with WCF in the picture this complicates things. That is, going back to the messages go on a header? Question: Back to my question then… how are others returning “messages” such as what was described above back through tiers of an application, over WCF and back to the caller?

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• ModalPopupExtender + ASP.NET AJAX: Can't page grid

  - by Alex

  I'm trying to page and sort my datagrid wich is inside a modalpopupextender but I can't page it in any way, already tried with , put the updatepanel inside, outside, in the middle (loL) and it does NOT work. modal popup does not get closed but the grid just dissapear. Code: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then BindData() End If End Sub Private Sub btnSearch_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSearch.Click SqlServerDS.SelectCommand = "SELECT * FROM emp WHERE name LIKE '%" & txtSearchName.Text & "%'" BindData() End Sub Private Sub BindData() grdSearch.DataSource = SqlServerDS grdSearch.DataBind() End Sub Private Sub grdBuscaPaciente_PageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs) Handles grdSearch.PageIndexChanging grdSearch.PageIndex = e.NewPageIndex BindData() End Sub Inside the Designer, this is the code h: <modalpopupextender> </modalpopupextender> <panel> <updatepanel> <gridview> </gridview> </updatepanel> </panel>

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• Refer to similar associated models with a common name

  - by Horace Loeb

  I have these models: class Bill < ActiveRecord::Base has_many :calls has_many :text_messages end class Call < ActiveRecord::Base belongs_to :bill end class TextMessage < ActiveRecord::Base belongs_to :bill end Now, in my domain calls and text messages are both "the same kind of thing" -- i.e., they're both "bill items". So I'd like some_bill.bill_items to return all calls and text messages associated with that bill. What's the best way to do this?

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• Rails: unable to set any attribute of child model

  - by Bryan Roth

  I'm having a problem instantiating a ListItem object with specified attributes. For some reason all attributes are set to nil even if I specify values. However, if I specify attributes for a List, they retain their values. Attributes for a List retain their values: >> list = List.new(:id => 20, :name => "Test List") => #<List id: 20, name: "Test List"> Attributes for a ListItem don't retain their values: >> list_item = ListItem.new(:id => 17, :list_id => 20, :name => "Test Item") => #<ListItem id: nil, list_id: nil, name: nil> UPDATE #1: I thought the id was the only attribute not retaining its value but realized that setting any attribute for a ListItem gets set to nil. list.rb: class List < ActiveRecord::Base has_many :list_items, :dependent => :destroy accepts_nested_attributes_for :list_items, :reject_if => lambda { |a| a[:name].blank? }, :allow_destroy => true end list_item.rb: class ListItem < ActiveRecord::Base belongs_to :list validates_presence_of :name end schema.rb ActiveRecord::Schema.define(:version => 20100506144717) do create_table "list_items", :force => true do |t| t.integer "list_id" t.string "name" t.datetime "created_at" t.datetime "updated_at" end create_table "lists", :force => true do |t| t.string "name" t.datetime "created_at" t.datetime "updated_at" end end

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• Problem locating file in a classpath

  - by Gandalf StormCrow

  I'm trying to read in file content, ex : public void myMethod(){ FileInputStream fstream = new FileInputStream(fileLocation); // Get the object of DataInputStream DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String strLine; while ((strLine = br.readLine()) != null) { .... .... ..... end while end method And I have at the begining of the class body private String fileLocation; and at the end of a class I have a getter and setter for it. Now I'm trying inject this file location from spring inside bean from this class and I specify the init-method of this class. But I get error cannot find the specified file as if its not on a classpath but it is inside war file? I'm building the project with maven and I put file in src/main/resources This is the error I get when trying to read file : Error: src\main\resources\ids.txt (The system cannot find the path specified) That is when I tried this : FileInputStream fstream = new FileInputStream("src\\main\\resources\\ids.txt"); how to reference the properly from the classpath? EDIT When I edit my code according to @BalusC solution , here is how it looks but I still get null error : ClassLoader classLoader = Thread.currentThread().getContextClassLoader(); InputStream input = classLoader.getResourceAsStream("src/main/resources/ids.txt"); // Get the object of DataInputStream BufferedReader br = new BufferedReader(new InputStreamReader(input)); String strLine; while ((strLine = br.readLine()) != null) { .... .... ..... end while end method

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• Mongomapper query collection problem

  - by kylemac

  When I define the User has_many meetings, it automatically creates a "user_id" key/value pair to relate to the User collections. Except I can't run any mongo_mapper finds using this value, without it returning nil or []. Meeting.first(:user_id = "1234") Meeting.all(:user_id = "1234") Meeting.find(:user_id = "1234") All return nil. Is there another syntax? Basically I can't run a query on the automatically generated associative ObjectId. # Methods class User include MongoMapper::Document key :user_name, String, :required = true key :password, String many :meetings end class Meeting include MongoMapper::Document key :name, String, :required = true key :count, Integer, :default = 1 end # Sinatra get '/add' do user = User.new user.meetings "foobar") #should read: Meeting.new(:name = "foobar") user.save end get '/find' do test = Meeting.first(:user_id = "4b4f9d6d348f82370b000001") #this is the _id of the newly create user p test # WTF! returns [] end

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• best way to parse plain text file with a nested information structure

  - by Beffa

  The text file has hundreds of these entries (format is MT940 bank statement) {1:F01AHHBCH110XXX0000000000}{2:I940X N2}{3:{108:XBS/091502}}{4: :20:XBS/091202/0001 :25:5887/507004-50 :28C:140/1 :60F:C0914CHF7789, :61:0912021202D36,80NTRFNONREF//0887-1202-29-941 04392579-0 LUTHY + xxx, ZUR :86:6034?60LUTHY + xxxx, ZUR vom 01.12.09 um 16:28 Karten-Nr. 2232 2579-0 :62F:C091202CHF52,2 :64:C091302CHF52,2 -} This should go into an Array of Hashes like [{"1"=>"F01AHHBCH110XXX0000000000"}, "2"=>"I940X N2", 3 => {108=>"XBS/091502"} etc. } ] I tried it with tree top, but it seemed not to be the right way, because it's more for something you want to do calculations on, and I just want the information. grammar Mt940 rule document part1:string spaces [:|/] spaces part2:document { def eval(env={}) return part1.eval, part2.eval end } / string / '{' spaces document spaces '}' spaces { def eval(env={}) return [document.eval] end } end end I also tried with a regular expression matches = str.scan(/\A[{]?([0-9]+)[:]?([^}]*)[}]?\Z/i) but it's difficult with recursion ... How can I solve this problem?

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• objective-c Derived class may not respond to base class method

  - by zadam

  Hi, I have derived from a 3rd party class, and when I attempt to call a method in the base class, I get the x may not respond to y compiler warning. How can I remove the warning? Repro: @interface ThirdPartyBaseClass : NSObject {} +(id)build; -(void)doStuff; @end @implementation ThirdPartyBaseClass +(id) build{ return [[[self alloc] init] autorelease]; } -(void)doStuff{ } @end @interface MyDerivedClass : ThirdPartyBaseClass {} +(id)buildMySelf; @end @implementation MyDerivedClass +(id)buildMySelf{ self = [ThirdPartyBaseClass build]; [self doStuff]; // compiler warning here - 'MyDerivedClass' may not respond to '+doStuff' return self; } @end Thanks!

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• How to save http referer in rails

  - by TenJack

  I'm trying to save the site that a user came from when they sign up. Right now I have a before_filter in my ApplicationController: before_filter :save_referer def save_referer unless is_logged_in? session['referer'] = request.env["HTTP_REFERER"] unless session['referer'] end end Then when a user is created, it checks this session variable and sets it to nil. Sometimes this does not work and I'm worried there might be some unintended things happening with using session like this. Does anyone have a better way? Or some input perhaps? EDIT: This is the logic I am using to save the referer: def create @user = User.new(params[:user]) if @user.save_with(session[:referer]) .... end User def save_with(referer) self.referer = referer unless referer == "null" self.save end Is there any reason why this should not work?

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• Which layer should create DataContext?

  - by Kevin

  I have a problem to decide which layer in my system should create DataContext. I have read a book, saying that if do not pass the same DataContext object for all the database updates, it will sometimes get an exception thrown from the DataContext. That's why i initially create new instance of DataContext in business layer, and pass it into data access layer. So that the same datacontext is used for all the updates. But this lead to one design problem, if i wanna change my DAL to Non-LinqToSQL in future, i need to re-write the code in business layer as well. Please give me some advice on this. Thanks. Example code 'Business Layer Public Sub SaveData(name As String) Using ts AS New TransactionScope() Using db As New MyDataContext() DAL.Insert(db,name) DAL.Insert(db,name) End Using ts.Complete() End Using End Sub 'Data Access Layer Public Sub Insert(db as MyDataContext,name As string) db.TableAInsert(name) End Sub

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• How to return children objects?

  - by keruilin

  I have -- what I think -- is a simple question. Here's my code: class Fruit < ActiveRecord::Base end class Apple < Fruit end class Kiwi < Fruit end Assume that I have all the STI setup correctly, and there are multiple types of Apple and Kiwi records in the table. From here... fruits = Fruit.find(:all) ...how do I return an array of just Apples from the fruits array?

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• how to save extracted icon in delphi

  - by radick

  hi all I am trying to make icon extractor i am successful in getting icon to image1.picture.icon ,its looking same as orginal file icon, but when i am trying to save (iamge1.picture.icon.savetofile(c:\imahe.ico)) its not saving as it is ,it saving with less colur and looking ugly cany any one please tell me what i am doing wrong ? here is my code procedure TForm1.Button1Click(Sender: TObject); begin OpenDialog1.Filter:='All files |*.*'; OpenDialog1.Title:='Please select file'; if OpenDialog1.Execute then Edit1.Text:=OpenDialog1.FileName; end; procedure TForm1.Button3Click(Sender: TObject); var szFileName: string; Icon: TIcon; SHInfo: TSHFileInfo; begin szFileName := Edit1.Text; if FileExists(Edit1.Text) then begin Icon := TIcon.Create; SHGetFileInfo(PChar(szFileName), 0, SHInfo, SizeOf(SHInfo), SHGFI_ICON); Icon.Handle := SHInfo.hIcon; Image1.Picture.Icon := Icon; end; end; procedure TForm1.Button2Click(Sender: TObject); begin if SaveDialog1.Execute then begin Image1.Picture.Icon.SaveToFile(SaveDialog1.FileName+'.ico'); ShowMessage('done'); end; end;

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• How to return a recordset from a function

  - by Scott

  I'm building a data access layer in Excel VBA and having trouble returning a recordset. The Execute() function in my class is definitely retrieving a row from the database, but doesn't seem to be returning anything. The following function is contained in a class called DataAccessLayer. The class contains functions Connect and Disconnect which handle opening and closing the connection. Public Function Execute(ByVal sqlQuery as String) As ADODB.recordset Set recordset = New ADODB.recordset Dim recordsAffected As Long ' Make sure we are connected to the database. If Connect Then Set command = New ADODB.command With command .ActiveConnection = connection .CommandText = sqlQuery .CommandType = adCmdText End With ' These seem to be equivalent. 'Set recordset = command.Execute(recordsAffected) recordset.Open command.Execute(recordsAffected) Set Execute = recordset recordset.ActiveConnection = Nothing recordset.Close Set command = Nothing Call Disconnect End If Set recordset = Nothing End Function Here's a public function that I'm using in cell A1 of my spreadsheet for testing. Public Function Scott_Test() Dim Database As New DataAccessLayer 'Dim rs As ADODB.recordset 'Set rs = CreateObject("ADODB.Recordset") Set rs = New ADODB.recordset Set rs = Database.Execute("SELECT item_desc_1 FROM imitmidx_sql WHERE item_no = '11001'") 'rs.Open Database.Execute("SELECT item_desc_1 FROM imitmidx_sql WHERE item_no = '11001'") 'rs.Open ' This never displays. MsgBox rs.EOF If Not rs.EOF Then ' This is displaying #VALUE! in cell A1. Scott_Test = rs!item_desc_1 End If rs.ActiveConnection = Nothing Set rs = Nothing End Function What am I doing wrong?

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• Custom Cocoa Framework and a problem using it

  - by happyCoding25

  Hello, I made a custom cocoa framework just to experiment and find the best way to make one but ran in to a problem using it. The framework project builds and compiles just fine, but when I use it in an xcode project I get the error, 'LogTest' undeclared. The name of the framework is LogTest Heres the code to my app that uses the framework: AppDelegate.h: #import <Cocoa/Cocoa.h> #import <LogTest/LogTest.h> @interface TestAppDelegate : NSObject <NSApplicationDelegate> { NSWindow *window; } @property (assign) IBOutlet NSWindow *window; @end AppDelegate.m: #import "TestAppDelegate.h" @implementation TestAppDelegate @synthesize window; - (void)awakeFromNib { [LogTest logStart:@"testing 123":@"testing 1234"]; //This is the line where the error occurs } @end Framework Code........ LogTest.h: #import <Cocoa/Cocoa.h> #import "Method.h" @protocol LogTest //Not sure if this is needed I just wanted a blank header @end Method.h: #import <Cocoa/Cocoa.h> @interface Method : NSObject { } + (void)logStart:(NSString *)test:(NSString *)test2; @end Method.m: #import "Method.h" @implementation Method + (void)logStart:(NSString *)test:(NSString *)test2 { NSLog(test); NSLog(test2); } @end If anyone knows why I am getting this error please reply. Thanks for any help

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• Can Nokogiri use a SAX parser to parse an HTML fragment?

  - by .yahoo.co.jpaqwsykcj3aulh3h1k0cy6nzs3isj

  I have this code. class MyParser < Nokogiri::XML::SAX::Document def characters(string) LOG.debug("characters #{string}") end def start_element(name, attrs = []) LOG.debug("start_element #{name}") end def end_element(name) LOG.debug("end_element #{name}") end end parser = Nokogiri::HTML::SAX::Parser.new(MyParser.new) parser.parse(File.new($*[0], 'rb')) Run on an HTML fragment like this, <h1>Hello</h1> <p>Hi.</p> the output shows that only the first element is processed: start_element h1 characters Hello end_element h1 If I wrap the fragment in html and body tags, the whole input is parsed. Is there a way to use a SAX style parser on HTML fragments?

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• Spark engine without master page

  - by msony

  I use application.spark file for master page In my app i have login page that does not need master page I tried remove master page from my login page using this tag , but it continue to use application.spark I can fix it by adding new master page in layout folder with name blank.spark file without any code and in my login page put this tag . looks too ugly, so I'm asking you if you know another option to fix this issue? I'm using: Spark-1.1.39975.0-release

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• When the property get and set method has been called?

  - by SmartestVEGA

  i have the following property declaration Public Property IsAreaSelected() As Integer Get Return If(ViewState("IsAreaSelected") Is Nothing, 0, Cint(ViewState("IsAreaSelected"))) End Get Set(ByVal value As Integer) ViewState("IsAreaSelected") = value End Set End Property i want to know when this set and get method will be called ? will it be called when i execute IsAreaSelected() =0 or is there anything like IsAreaSelected().get() or IsAreaSelected().set() ??

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• Active Record two belongs_to calls or single table inheritance

  - by ethyreal

  In linking a sports event to two teams, at first this seemed to make sense: events - id:integer - integer:home_team_id - integer:away_team_id teams - integer:id - string:name However I am troubled by how I would link that up in the active record model: class Event belongs_to :home_team, :class_name => 'Team', :foreign_key => "home_team_id" belongs_to :away_team, :class_name => 'Team', :foreign_key => "away_team_id" end Is that the best solution? In an answer to a similar question I was pointed to single table inheritance, and then later found polymorphic associations. Neither of which seemed to fit this association. Perhaps I am looking at this wrong, but I see no need to subclass a team into home and away teams since the distinction is only in where the game is played. If I did go with single table inheritance I wouldn't want each team to belong_to an event so would this work? # app/models/event.rb class Event < ActiveRecord::Base belongs_to :home_team belongs_to :away_team end # app/models/team.rb class Team < ActiveRecord::Base has_many :teams end # app/models/home_team.rb class HomeTeam < Team end # app/models/away_team.rb class AwayTeam < Team end I thought also about a has_many through association but that seems two much as I will only ever need two teams, but those two teams don't belong to any one event. event_teams - integer:event_id - integer:team_id - boolean:is_home Is there a cleaner more semantic way for making these associations in active record? or is one of these solutions the best choice? Thanks

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• Ruby - Call method passing values of array as each parameter

  - by Markus Orreilly

  I'm currently stuck on this problem. I've hooked into the method_missing function in a class I've made. When a function is called that doesn't exist, I want to call another function I know exists, passing the args array as all of the parameters to the second function. Does anyone know a way to do this? For example, I'd like to do something like this: class Blah def valid_method(p1, p2, p3, opt=false) puts "p1: #{p1}, p2: #{p2}, p3: #{p3}, opt: #{opt.inspect}" end def method_missing(methodname, *args) if methodname.to_s =~ /_with_opt$/ real_method = methodname.to_s.gsub(/_with_opt$/, '') send(real_method, args) # <-- this is the problem end end end b = Blah.new b.valid_method(1,2,3) # output: p1: 1, p2: 2, p3: 3, opt: false b.valid_method_with_opt(2,3,4) # output: p1: 2, p2: 3, p3: 4, opt: true (Oh, and btw, the above example doesn't work for me)

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• Would Apache running on port 8080 prevent dynamically loaded scripts in JavaScript?

  - by editor

  Had a nice PHP/HTML/JS prototype working on my personal Linode, then tried to throw it into a work machine. The page adds a script tag dynamically with some JavaScript. It's a bunch of Google charts that update based on different timeslices. That code looks something like this: // jQuery $.post to send the beginning and end timestamps $.post("channel_functions.php", data_to_post, function(data){ // the data that's returned is the javascript I want to load var script = document.createElement('script'); var head= document.getElementsByTagName('head')[0]; var script= document.createElement('script'); var text = document.createTextNode(data); script.type= 'text/javascript'; script.id = 'chart_data'; script.appendChild(text); // Adding script tag to page head.appendChild(script); // Call the function I know were present in the script tag loadTheCharts(); }); function loadTheCharts() { // These are the functions that were loaded dynamically // By this point the script tag is supposed be loaded, added and eval'd function1(); function2(); } Function1() and function2() don't exist until they get added to the dom, but I don't call loadTheCharts() until after the $.post has run so this doesn't seem to be a problem. I'm one of those dirty PHP coders you mother warned you about, so I'm not well versed in JavaScript beyond what I've read in the typical go-to O'Reilly books. But this code worked fine on my personal dev server, so I'm wondering why it wouldn't work on this new machine. The only difference in setup, from what I can tell, is that the new machine is running on port 8080, so it's 192.168.blah.blah:8080/index.php instead of nicedomain.com/index.php. I see the code was indeed added to the dom when I use webmaster tools to "view generated source" but in Firebug I get an error like "function2() is undefined" even though my understanding was that all script tags are eval'ed when added to . My question: Given what I've laid out, and that the machine is running on :8080, is there a reason anyone can think of as to why a dynamically loaded function like function2() would be defined on the Linode and not on the machine running Apache on 8080?

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• Signals and Variables in VHDL - Problem

  - by Morano88

  I have a signal and this signal is a bitvector. The length of the bitvector depends on an input n, it is not fixed. In order to find the length, I have to do some computations. Can I define a signal after defining the variables ? It is ggiving me errors when I do that. It is working fine If I keep the signal before the variables .. but I don't want that .. the length of Z depends on the computations of the variables. What is the solution ? library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity BSD_Full_Comp is Generic (n:integer:=8); Port(X, Y : inout std_logic_vector(n-1 downto 0); FZ : out std_logic_vector(1 downto 0)); end BSD_Full_Comp; architecture struct of BSD_Full_Comp is Component BSD_BitComparator Port ( Ai_1 : inout STD_LOGIC; Ai_0 : inout STD_LOGIC; Bi_1 : inout STD_LOGIC; Bi_0 : inout STD_LOGIC; S1 : out STD_LOGIC; S0 : out STD_LOGIC ); END Component; Signal Z : std_logic_vector(2*n-3 downto 0); begin ass : process Variable length : integer := n; Variable pow : integer :=0 ; Variable ZS : integer :=0; begin while length /= 0 loop length := length/2; pow := pow+1; end loop; length := 2 ** pow; ZS := length - n; wait; end process; end struct;

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