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• Rails architecture questions

  - by justinbach

  I'm building a Rails site that, among other things, allows users to build their own recipe repository. Recipes are entered either manually or via a link to another site (think epicurious, cooks.com, etc). I'm writing scripts that will scrape a recipe from these sites given a link from a user, and so far (legal issues notwithstanding) that part isn't giving me any trouble. However, I'm not sure where to put the code that I'm writing for these scraper scripts. My first thought was to put it in the recipes model, but it seems a bit too involved to go there; would a library or a helper be more appropriate? Also, as I mentioned, I'm building several different scrapers for different food websites. It seems to me that the elegant way to do this would be to define an interface (or abstract base class) that determines a set of methods for constructing a recipe object given a link, but I'm not sure what the best approach would be here, either. How might I build out these OO relationships, and where should the code go?

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• How to deal with name/value pairs of function arguments in MATLAB

  - by Richie Cotton

  I have a function that takes optional arguments as name/value pairs. function example(varargin) % Lots of set up stuff vargs = varargin; nargs = length(vargs); names = vargs(1:2:nargs); values = vargs(2:2:nargs); validnames = {'foo', 'bar', 'baz'}; for name = names validatestring(name{:}, validnames); end % Do something ... foo = strmatch('foo', names); disp(values(foo)) end example('foo', 1:10, 'bar', 'qwerty') It seems that there is a lot of effort involved in extracting the appropriate values (and it still isn't particularly robust again badly specified inputs). Is there a better way of handling these name/value pairs? Are there any helper functions that come with MATLAB to assist?

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• Web service accessing client database

  - by chupinette

  Hello all! I am new to web services and i have a question: Should a web service be able to access the client database? Sorry if i am not using the proper terms. Lets say i have a web service method called : GetCarDetails(string name) which will actually return details from car table. in this method i have an sql statement like SELECT * FROM car WHERE name = ?. In the client application, i have a textbox where i can input a name and a button on which when i click, fill a gridview. So im kinda confused, should the web service normally know that the client has a table called car?Please correct me if ive used the wrong terms. Thanks

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• SDL versus GLFW?

  - by user697111

  What are the pros and cons to each? It seems they serve the same purpose. I have a few demos with each and they seem about the same. Performance or cross platform wise, is one better than the other? The only thing I notice is that SDL seems to have more "helper" libraries (fonts, images, mixer, built in sound support, etc). On its site, GLFW claims to be more "OpenGL" focused, but still have to use a GLEW to get any newer OpenGL features (same with SDL). I guess I'm leaning towards using SDL now (more mature, more features, more community). Are there any reasons I've missed why GLFW stands out and I should use it instead of SDL?

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• Stored Procedure or calculations via IQueryable?

  - by Shawn Mclean

  This is a question that is based on choosing performance over design practices. If I have a method that will be executed many times a second; public static IQueryable<IPerson> InRadius(this IQueryable<IPerson> query, Coordinate center, double radius) { return (from u in query where CallHeavyMathFormula(u, center, radius) select u); } This extension method for IQueryable generates a SQL that does some heavy maths calculation (Cosine, Sine, etc). This would mean the application sends 1-2KB of sql to the server per call. I've heard of placing all application logic, in your application. I also would like to change to a database such as azure or one of those scalable databases in the future. How do I handle something like this? Should I leave it as it is now or write stored procedures? How do applications like twitter or facebook do it?

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• Trouble Copying custom class initialization

  - by Parad0x13

  I have a custom class of type NSObject that contains a single NSMutableArray. This class is called Mutable2DArray and is designed to emulate a 2 dimensional array of type NSMutableArray. There is a custom init method - (id)initWithX:(int)x Y:(int)y that asks for the dimensions for the array and allocates the required arrays within the only array the class owns. My issue is when I try to copy an instance of Mutable2DArray I get an error saying the copyWithZone is an unrecognized selector. I thought copy was a base method of NSObject so I'm confused why I cant create a copy of the instance like this: Mutable2DArray *Array1 = [[Mutable2DArray alloc] initWithX:10 Y:10]; Mutable2DArray *Array2 = [Array1 copy]; Am I missing something so obvious here?

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• pagecontrol indicator custom image instead of Default

  - by iphonecool

  How i change the color of pagination dots of UIPageControl? In this link the sample code is given.But it shows 3 errors for me... 1'st ERROR: Line:CGRect currentBounds = self.bounds; Error:requst for member 'bounds' in something not a structure or union Method:-(void)drawRect: 2nd Err: same error with same line in touchesBegan method. 3rd Err:@protocol PageControlDelegate @optional (void)pageControlPageDidChange:(PageControl *)pageControl; @end Error:Expected ')' before 'PageControl' .These are the three errors occurs for me...Please help me out to solve this.. I want to change the pagecontrol indicator(dot) color... Thanks & Regards, Renuga

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• What is the best way to add attributes to auto-generated entities (using VS2010 and EF4)

  - by Dani

  ASP.NET MVC2 has strong support for using attributes on entities (validation, and extending Html helper class and more). If I generated my Model from the Database using VS2010 EF4 Entity Data Model (edmx and it's cs class), And I want to add attributes on some of the entities. what would be the best practice ? how should I cope with updating the model (adding more fields / tables to the database and merging them into the edmx) - will it keep my attributes or generate a new cs file erasing everything ? (Manual changes to this file may cause unexpected behavior in your application.) (Manual changes to this file will be overwritten if the code is regenerated.)

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• LINQ to SQl updating primary key field?

  - by Curtis White

  I have a linq to sql table/class that uses a GUID as both a primary key and as foreign key. This problem came up when factoring some code that previously worked. The exception generated is "Operation is not valid due to the current state of the object." The process I use is as such: aspnet_User user() = new aspnet_User(); aspnet_user.childTable = new childTable(); .. set some properties user.Insert() -> my custom method ... @ my custom method using (mycontext dc = new context() ) { user.childTable.ID = (Guid)myNewlyCreatedGuid; } The exception occurs on the assignment childTable.set_UserId().

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• PHP - WideImage class cropping

  - by Kolind

  I am trying to crop a large image to make thumbnails. But I can't get WideImage to save the file. I've tried the following: 1st method: $img = WideImage::load('../files/' . $file_name)->crop('center', 'center', 200, 200); $img->saveToFile('../files/thumb/thumb_' . $file_name); 2nd method: $img = WideImage::load('../files/' . $file_name)->crop('center', 'center', 200, 200); $img->copy('../files/thumb/thumb_' . $file_name); But nothing seems to happen, when I am performing any of these methods. I am getting no errors and no thumbnails. Am I doing something wrong here?

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• Passing an object as a parameter to a windows service

  - by user220723

  Is there some way to pass an object to a windows service? I know the method myServiceController.Star(string[] arg) but i need to pass a more complex object than a string array. Actually, i don't need the object to be passed as a parameter, what i really needs is that the service can use an object created in a windows forms application. I've tried using System.Web.Script.Serialization.JavaScriptSerializer.Serialize method to convert the object into a Json but i couldn't because the object contains a circular reference. I also tried using pointers, but i couldn't becouse it is a managed type object. Any idea what can i do?

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• Editing/Modifying a .java file programmatically? (not the .class file)

  - by Jay

  So, here is a piece of code using CodeModel that generates java code: JCodeModel cm = new JCodeModel(); JDefinedClass dc = cm._class("foo.Bar"); JMethod m = dc.method(0, int.class, "foo"); m.body()._return(JExpr.lit(5)); File f = new File("C:/target/classes"); f.mkdirs(); cm.build(f); This code generates a .java file: package foo; public class Bar { int foo() { return 5; } } However, I DO NOT want CodeModel to create a new java file for me. I do have a .java file already and would like to add a few lines of code to a method inside it. So, I would like the API to modify the java file directly/ create a modified copy of it. Is there a way to doing this?

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• Confused about "override" vs. "new" in C#

  - by iTayb

  I'm having the following classes: class Base { public virtual void Print() { Console.WriteLine("Base"); } } class Der1 : Base { public new virtual void Print() { Console.WriteLine("Der1"); } } class Der2 : Der1 { public override void Print() { Console.WriteLine("Der2"); } } This is my main method: Base b = new Der2(); Der1 d1 = new Der2(); Der2 d2 = new Der2(); b.Print(); d1.Print(); d2.Print(); The output is Base, Der2, Der2. As far as I know, Override won't let previous method to run, even if the pointer is pointing to them. So the first line should output Der2 as well. However Base came out. How is it possible? How the override didn't work there?

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• Add UserControl To Page From Another Class

  - by Raika

  I have page and call method inside my page. I want to add some control to my page Control (not page itself) inside that method. namespace Program { public partail class Default : Page { protected void Page_Load(object sender, Eventargs e) { MyClass.Calling(this); } } } in another class namespace Program { public class MyClass { public static void Calling(Page page) { Textbox txt = new Textbox() // I want somthing like this. // page.PlaceHolder1.Controls.Add(txt); } } } Is this possible? My Default.aspx : <%@ Page Title="Home Page" MasterPageFile="~/Site.master" ... %> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder> </asp:Content> Update: thanks to The King for help. his suggest work correctly if control is inside page not Content of master page like my defualt sample code.

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• Passing data between Castle Windsor's Interceptors

  - by Nhím H? Báo

  I'm adopting Castle Windsor for my WCF project and feel really amazed about this. However, I'm having a scenario that I don't really know if Castle Windsor supports. For example I have the following chained Interceptors Interceptor 1 > Interceptor 2 > Interceptor 3 > Interceptor 4 > Real method Interceptor 1 returns some data and I want that to be available in Interceptor 2 Interceptor 2 in turn does it work and returns the data that I want to make avaialbe in the 3,4, interceptor. The real case scenario is that we're having a WCF service, Interceptor 1 will parse the request header into a Header object(username, password, etc.). The latter interceptors and real method will ultilize this Header object. I know that I can use Session variable to transport data, but is it a built-in, more elegant, more reliable way to handle this?

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• mvc action name in url

  - by Paul

  UPDATE: My model going into the save method is PartialViewModel, which in the save method, is pushed into the index's ContactViewModel and sent back. This wasn't clear. I am playing around with MVC3, and have a contact controller with a SaveDetails action. The index cshtml has a partial with a form whose action is pointing to this controller. When I submit the form not having completed it fully, thereby firing the validation, the url now contains the SaveDetails action name (http://localhost:7401/Contact/SaveDetails). The form code is: @using (Html.BeginForm("SaveDetails", "Contact")) { ... } The controller action looks like this: public ActionResult SaveDetails(Models.PartialsViewModel pvm) { return View("Index", new ContactViewModel{ PartialsViewModel = pvm } ); } What am I doing wrong?

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• jquery attribute indexOf

  - by Victor

  When I am getting at an attribute onclick of custom(Reporting Services) checkbox it gives me correct result. However when I am trying to use indexOf on that result it says "Object doesn't support this property or method", i.e. this is fine, gives me a long string $('input[id*=CustomCheckBox]').click(function() { alert( $(this).attr("onclick") ); }); But this gives an error(object doesn't support this property or method): $('input[id*=CustomCheckBox]').click(function() { if ($(this).attr("onclick").indexOf("SomeString") > -1 ) { //do some processing here } } What would I need to modify so that indexOf is working properly?

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• Rails: Ajax-enabled form without a model object

  - by Caffeine Coma

  I'm new to Rails and having a hard time figuring out how to create a form that submits over Ajax without having a corresponding model object. My use case is a simple form that collects an email address and sends it an email; there's nothing to be persisted, so no model. In cases where I do have a model, I've had success with form_for(@model, remote: true). I can't seem to find the right helper for the case where there is no model. I tried form_tag(named_path, remote: true) and that works, but does not use Ajax. Pointers to an example with an example with a proper controller, .html.erb and routes.rb would be really appreciated.

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• Twitter search c#

  - by Lily

  Hi, I have implemented a method which manually scrapes the Search Twitter page and gets the tweets on different pages. But since there is a fast refresh rate, the method triggers an exception. Therefore I have decided to use TweetSharp API instead var search = FluentTwitter.CreateRequest() .AuthenticateAs(TWITTER_USERNAME, TWITTER_PASSWORD) .Users().SearchFor("dumbledore"); var result = search.Request(); var users = result.AsUsers(); this code was on the site. Does anyone know how I can avoid giving my credentials and retrieve from all users and not just the ones I have as friends? Thanks!

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• Rewriting .each() loop as for loop to optimize, how to replicate $(this).attr()

  - by John B

  I running into some performance issues with a jquery script i wrote when running in ie so I'm going through it trying to optimize any way possible. Apparently using for loops is way faster than using the jQuery .each method. This has led me to a question regarding the equivalent of $(this) inside a for loop. I'm simplifying what I'm doing in my loop down to just using an attr() function as it gets across my main underlying question. Im doing this with each(simplified) var existing = $('#existing'); existing.each(function(){ console.log($(this).attr('id')); }); And I've tried rewriting it as a for loop as such: var existing = $('#existing'); for(var i = 0;i < existing.length;i++) { console.log(existing[i].attr('id')); } Its throwing an error saying: Uncaught TypeError: Object #<HTMLDivElement> has no method 'attr' Thanks.

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• Efficient bitshifting an array of int?

  - by nn

  Hi, To be on the same page, let's assume sizeof(int)=4 and sizeof(long)=8. Given an array of integers, what would be an efficient method to bitshift the array to either the left or right? I am contemplating an auxiliary variable such as a long, that will compute the bitshift for the first pair of elements (index 0 and 1) and set the first element (0). Continuing in this fashion the bitshift for elements (index 1 and 2) will be computer, and then index 1 will be set. I think this is actually a fairly efficient method, but there are drawbacks. I cannot bitshift greater than 32 bits. I think using multiple auxiliary variables would work, but I'm envisioning recursion somewhere along the line.

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• Calling this[int index] via reflection

  - by tkutter

  I try to implement a reflection-based late-bound library to Microsoft Office. The properties and methods of the Offce COM objects are called the following way: Type type = Type.GetTypeFromProgID("Word.Application"); object comObject = Activator.CreateInstance(type); type.InvokeMember(<METHOD NAME>, <BINDING FLAGS>, null, comObject, new object[] { <PARAMS>}); InvokeMember is the only possible way because Type.GetMethod / GetProperty works improperly with the COM objects. Methods and properties can be called using InvokeMember but now I have to solve the following problem: Method in the office-interop wrapper: Excel.Workbooks wb = excel.Workbooks; Excel.Workbook firstWb = wb[0]; respectively foreach(Excel.Workbook w in excel.Workbooks) // doSmth. How can I call the this[int index] operator of Excel.Workbooks via reflection?

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• How do I show and position an Image initialized in the codebehind on my page?

  - by Andreas Strandfelt

  Hello. I have created a simple method to check if an image has been approved and finally returns it as an control. But how do i call and show it on the page? I've tried something like this in the aspx-file: <% SendImage("DKBygMiniLogo.gif", "True"); %> Here is the simple method: protected Image SendImage(object Image, object Approved) { bool approved = Convert.ToBoolean(Approved); Image img = new Image(); if (approved) { img.ImageUrl = "~/images/Ads/" + Image.ToString(); img.Visible = true; } else { img.ImageUrl = "~/images/Ads/" + Image.ToString(); img.Visible = false; } return img; } How do I actually show the image?

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• Manage multiple Jlabel's events

  - by IMAnis_tn

  I have a left Panel with multiples Jlabels which i use them as buttons to change a Main Panel's content which is layouted with a CardLayout. I cant work perfectly with these events: mouseEntered : to make highlight effect to the jlabel mouseExited : to take off the highlight effect. mouseClicked : to change the content of the main Panel and start some threads The problem here that can't found an event or a method tell me that another Jlabel has been clicked so i can stop my threads started in the mouseClicked event, OR an event or method tell me that a JPanel in the CardLayout has been displayed or hidden.

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• Best way to reduce consecutive NAs to single NA

  - by digEmAll

  I need to reduce the consecutive NA's in a vector to a single NA, without touching the other values. So, for example, given a vector like this: NA NA 8 7 NA NA NA NA NA 3 3 NA -1 4 what I need to get, is the following result: NA 8 7 NA 3 3 NA -1 4 Currently, I'm using the following function: reduceConsecutiveNA2One <- function(vect){ enc <- rle(is.na(vect)) # helper func tmpFun <- function(i){ if(enc$values[i]){ data.frame(L=c(enc$lengths[i]-1, 1), V=c(TRUE,FALSE)) }else{ data.frame(L=enc$lengths[i], V=enc$values[i]) } } Df <- do.call(rbind.data.frame,lapply(1:length(enc$lengths),FUN=tmpFun)) return(vect[rep.int(!Df$V,Df$L)]) } and it seems to work fine, but probably there's a simpler/faster way to accomplish this task. Any suggestions ? Thanks in advance.

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