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• UITableView via NSFetchedResultsControllerDelegate, select first record by default?

  - by deafgreatdane

  I have a UITableView that gets populated from CoreData via a controller that implements NSFetchedResultsControllerDelegate. How can I have it automatically select the first row (and fire the tableView:didSelectRowAtIndexPath message)? The tableview is used for a variety of predicate queries, so I'm suspicious of solutions that work on the UIViewController lifecycle (viewDidLoad, etc), but I'm new to the platform, so I'm open. I've tried a variety of things, but I'm not sure where in the call stack to put it. I've tried calling cell.selected = true inside tableView:cellForRowAtIndex: method, but that just ends up turning the cell black (and doesn't fire the selected callback method) A tagent question, with all the delegating and core data protocols, does it imply asynchronous data fetch (multiple threads)? Or is the NSFetchedResultsController calling all its related methods in the same thread? Maybe I'm just scared that if it is async, there would be race conditions that would be tough to troubleshoot later.

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• Is it possible to bind data asynchronously between two dropdownlists in a view?

  - by user252160

  I'd like to achieve the following effect using ASP.NET MVC and JQuery. I've got a drop down list displaying a list of Countries. I want to make it so that when I change the value of the country, a new drop down list appears below it, showing a list of companies whose country of origin is the particular selected company. The thing is that I do not want to rely too much on controller actions because I'm using it in a Template Helper which is a "headless" view. Can I bind it somehow?

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• ASP.NET MVC does not add ModelError when invoking from unit test

  - by Tomas Lycken

  I have a model item public class EntryInputModel { ... [Required(ErrorMessage = "Description is required.", AllowEmptyStrings = false)] public virtual string Description { get; set; } } and a controller action public ActionResult Add([Bind(Exclude = "Id")] EntryInputModel newEntry) { if (ModelState.IsValid) { var entry = Mapper.Map<EntryInputModel, Entry>(newEntry); repository.Add(entry); unitOfWork.SaveChanges(); return RedirectToAction("Details", new { id = entry.Id }); } return RedirectToAction("Create"); } When I create an EntryInputModel in a unit test, set the Description property to null and pass it to the action method, I still get ModelState.IsValid == true, even though I have debugged and verified that newEntry.Description == null. Why doesn't this work?

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• a full-screen UIImagePickerController with the right scale?

  - by Kay

  Hi, I'm customizing my image picker controller and I want to have a full-screen viewfinder. I think this might be pretty an old topic and I found an answer here: http://www.gorbster.net/blog/archives/144 But what I want to know is if there's a way to achieve this without distorting the scale of the image. If I scale that clipped preview image, I'm distorting its original x-y ratio, and I want to avoid it. Is there a way to prevent the preview image from being clipped so that I could retain the original 1200x1600 ratio? Thanks!

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• Inserting the record into Data Base through JPA

  - by vinay123

  In my code I am using JSF - Front end , EJB-Middile Tier and JPA connect to DB.Calling the EJB using the Webservices.Using MySQL as DAtabase. I have created the Voter table in which I need to insert the record. I ma passing the values from the JSF to EJB, it is working.I have created JPA controller class (which automatcally generates the persistence code based on the data base classes) Ex: getting the entity manager etc., em = getEntityManager(); em.getTransaction().begin(); em.persist(voter); em.getTransaction().commit(); I have created the named query also: @NamedQuery(name = "Voter.insertRecord", query = "INSERT INTO Voter v values v.voterID = :voterID,v.password = :password,v.partSSN = :partSSN,v.address = :address, v.zipCode = :zipCode,v.ssn = :ssn, v.vFirstName = :vFirstName,v.vLastName = :vLastName,v.dob = :dob"),But still not able to insert the record? Can anyone help me in inserting the record into the Data base through JPA.(Persistence object)?

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• Ruby on Rails: reducing complexity of parameters in a RESTFul HTTP POST request (multi-model)

  - by randombits

  I'm using cURL to test a RESTFul HTTP web service. The problem is I'm normally submitting a bunch of values normally like this: curl -d "firstname=bob&lastname=smith&age=25&from=kansas&someothermodelattr=val" -H "Content-Type: application/x-www-form-urlencoded" http://mysite/people.xml -i The problem with this is my controller will then have code like this: unless params[:firstname].nil? end unless params[:lastname].nil? end // FINALLY @person = People.new(params[:firstname], params[:lastname], params[:age], params[:from]) etc.. What's the best way to simplify this? My Person model has all the validations it needs. Is there a way (assuming the request has multi-model parameters) that I can just do: @person = People.new(params[:person]) and then the initializer can take care of the rest?

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• Why are action based web frameworks predominant?

  - by deamon

  Most web frameworks are still using the traditional action based MVC model. A controller recieves the request, calls the model and delegates rendering to a template. That is what Rails, Grails, Struts, Spring MVC ... are doing. The other category, the component based frameworks like Wicket, Tapestry, JSF, or ASP.Net Web Forms have become more popular over the last years, but my perception is that the traditional action based approach is far more popular. And even ASP .Net Web Forms has become a sibling name ASP .Net Web MVC. I think the kind of applications built with both types of frameworks is overlapping very much, so the question is: Why are action based frameworks so predominant?

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• iphone - how to mentain the state of UIWebView ?

  - by g.revolution

  Hi, i am having a UIWebView showing and HTML page that has some checkboxes, radio buttons. My Application has tabbar controller that switches b/w two controllers. How i can maintain the current state of UIWebView. ( e.g. i have selected a checkbox and i change the tab and go to other ViewController and again come back to UIWebView. the WebView resets itself and goes to the start... i want to maintain the state of UIWebView ( all the checkboxes clicked) .. how i will do that ?? any idea ?? thanks in advance

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• How to transfer url parameters to repoze custom predicate checkers

  - by user281521

  I would like to create a repoze custom predicate checker that is capable to access url parameters and validate something. But I would like to use allow_only to set this permission checker in all the controller's scope. Something like: class MyController(BaseController): allow_only = All(not_anonymous(msg=l_(u'You must be logged on')), my_custom_predicate(msg=l_(u'something wrong'))) def index(self, **kw): return dict() then, my_custom_predicate should check the url paramters for every request in every MyController method, and do whatever it do. The problem is just that: how to allow my_custom_predicate to check the url parameters, using it in that way I wrote above.

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• Handling dynamic data from javascript or rails

  - by 99miles

  I have page consisting of a calendar view ( http://code.google.com/p/calendardateselect/ ) as well as divs, each of which contain information about a person. In each div I want to have a link to a new controller and action, and pass the id for the person and the date selected in the calendar. I can think of a one way, but I'm thinking there's likely a better solution: 1) Do something like: =link_to_function "Week", "weekClicked(#{person.id})" Then in the weekClicked() javascript method I get the selected date from the calendar, such as: $('e_date').selected_date; then with javascript I could make a post request as mentioned here: http://stackoverflow.com/questions/133925/javascript-post-request-like-a-form-submit 2) Or, is there a way that I could make each link a button in it's own form and maybe have a hidden field that gets the selected date from the calendar as or before the form is submitted? I tried this too, but couldn't figure it out. This definitely seems like it's more on the right track than #1. Thanks.

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• ReturnUrl = Default.aspx for MVC?

  - by Cynthia

  I'm trying to secure my entire MVC site, so before the Home controller, I added an [Authorize] attribute. Now if you run it from Visual Studio or navigate using the root URL (e.g. http://localhost:2897) it does redirect to the login page, as expected. However the URL in the address bar after redirection looks like this: http://localhost:2897/Account/LogOn?ReturnUrl=%2fdefault.aspx%3f I haven't tested this out, seeing as I have not implemented my authentication code. However, this looks like a big problem to me, since I do not have a default.aspx in my project! My authentication tag in the web.config looks like this: <authentication mode="Forms"> <forms loginUrl="~/Account/LogOn" defaultUrl="~/Home/Index" timeout="2880"/> </authentication> Why doesn't it pick up this route as the default ReturnUrl instead of default.aspx?

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• RenderAction in an HtmlHelperExtension Method?

  - by TimLeung

  I am trying to call the RenderAction Extension Method within my own Html Helper: System.Web.Mvc.Html.ChildActionExtensions.RenderAction(helper, "account", "login"); this is so that along with some additional logic, I would like all html helpers to use a common method name structure when calling it on the view: <%= Html.CompanyName().RenderAccount() %> but the problem I am having is that, asp.net will complain about not finding the actual route it needs to process. It does not take in the parameters of "controller" to be used as the action and "login" to be used as the action. It seems to only reference the current route. Any ideas how I can package up the RenderAction?

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• ASP.NET MVC UpdateModel - fields vs properties??

  - by mrjoltcola

  I refactored some common properties into a base class and immediately my model updates started failing. UpdateModel() and TryUpdateModel() did not seem to update inherited public properties. I cannot find detailed info on MSDN nor Google as to the rules or semantics of these methods. The docs are terse (http://msdn.microsoft.com/en-us/library/dd470933.aspx), simply stating: Updates the specified model instance using values from the controller's current value provider. SOLVED: MVC.NET does indeed handle inherited properties just fine. This turned out to have nothing to do with inheritance. My base class was implemented with public fields, not properties. Switching them to formal properties (adding {get; set; }) was all I needed. This has bitten me before, I keep wanting to use simple, public fields. I would argue that fields and properties are syntactically identical, and could be argued to be semantically equivalent, for the user of the class.

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• how to disable web page cache throughout the servlets

  - by Kurt

  To no-cache web page, in the java controller servlet, I did somthing like this in a method: public ModelAndView home(HttpServletRequest request, HttpServletResponse response) throws Exception { ModelAndView mav = new ModelAndView(ViewConstants.MV_MAIN_HOME); mav.addObject("testing", "Test this string"); mav.addObject(request); response.setHeader("Cache-Control", "no-cache, no-store"); response.setHeader("Pragma", "no-cache"); response.setDateHeader("Expires", 0); return mav; } But this only works for a particular response object. I have many similar methods in a servlet. And I have many servlets too. If I want to disable cache throughout the application, what should I do? (I do not want to add above code for every single response object) Thanks in advance.

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• How to loop through the FormCollection to check if textboxes have values?

  - by Sasha

  Hi there. I have a search page that has 6 textboxes which i pass as FormCollection to the action in the controller. I dont want to search for records if ther is no values in textboxes. Is there a way to loop through all textboxes in FormCollection without to check which ones have values in them? I am a student in the college and this project is part of my summer experience program. I realize that this is a newbie question :) Thank you!

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• Redirect away from HTTPS with ASP.NET MVC App

  - by Amadiere

  I'm using ASP.NET MVC 2 and have a login page that is secured via HTTPS. To ensure that the user always accesses those pages via SSL, I've added the attribute [RequiresHttps] to the controller. This does the job perfectly. When they have successfully logged in, I'd like to redirect them back to HTTP version. However, there isn't a [RequiresHttp] attribute and I'm struggling to get my head around how I might achieve this. The added (potential) complication is that the website when in production is hosted at the route of the domain, but for development and testing purposes it is within a sub directory / virtual directory / application. Am I over-thinking this and is there an easy solution staring me in the face? Or is it a little more complex?

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• So does Apple recommend to not use predicates and sort descriptors in an NSFetchRequest?

  - by dontWatchMyProfile

  From the docs: To summarize, though, if you execute a fetch directly, you should typically not add Objective-C-based predicates or sort descriptors to the fetch request. Instead you should apply these to the results of the fetch. If you use an array controller, you may need to subclass NSArrayController so you can have it not pass the sort descriptors to the persistent store and instead do the sorting after your data has been fetched. I don't get it. What's wrong with using them on fetch requests? Isn't it stupid to get back a whole big bunch of managed objects just to pick out a 1% of them in memory, leaving 99% garbage floating around? Isn't it much better to only fetch from the persistent store what you really need, in the order you need it? Probably I did get that wrong...

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• UIViewController prevent view from unloading

  - by Ican Zilb

  When my iPhone app receives a Memory warning the views of UIViewControllers that are not currently visible get unloaded. In one particular controller unloading the view and the outlets is rather fatal. I'm looking for a way to prevent this view from being unloaded. I find this behavior rather stupid - I have a cache mechanism, so when a memory warning comes - I unload myself tons of data and I free enough memory, but I definitely need this view untouched. I see UIViewController has a method 'unloadViewIfReloadable', which gets called when the Memory Warning comes. Does anybody know how to tell Cocoa Touch that my view is not reloadable? Any other suggestions how to prevent my view from being unloaded on Memory Warning? Thanks in advance

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• ASP.NET MVC: What's the difference in concept between Service and Repository

  - by Richard77

  Hello, The question I'm asking is kind of subjective. I've seen twice, while exercising with real projects such as StoreFront, both Repository and Services. Sometimes they can just be folders or projects attached to the solution. But they contain classes and interfaces. So, I'd like to know what goes to the repository and what goes to the services. So far, I was familiar with repositories (we put methods and properties in the repository to reduce the complexity in the controller). How about the services? So, ASP.NET MVC: What's the difference in concept between Service and Repository? (Maybe none) My question is Kind of subjective, but I'd like to make sure that I'm not missing anything. Thanks for helping

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• How do I verify the URL that ActiveResource intends to use on a call?

  - by btelles

  Hi there, I'm trying to request data from another Rails app, but I keep getting a "URL not found" error. Is it possible to use the debugger to figure out the intended URL and parameters for an intended ActiveResource call? For example, I'd like to make a GET request with the following parameters: https://some_server.com/employees/search.xml?last_name=smith And I have the following ActiveResource model class Employee < ActiveResource::Base self.site = "https://.some_server.com" end And the some_server.com app has a search action that maps this way: map.connect "/employees/search.:format", :controller => 'employees', :action => 'search' But when I try this: Employee.new(:last_name => 'smith).get(:search) I get a 404 "Service not found" error. To me, that sounds like the URL that ACtiveResource is requesting is incorrect, 'cause when I make the above request via a browser, I get the xml. Any idea what I'm doing wrong? Cheerio, Berns

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• Map the physical file path in asp.net mvc

  - by rmassart

  Hi, I am trying to read an XSLT file from disk in my ASP.Net MVC controller. What I am doing is the following: string filepath = HttpContext.Request.PhysicalApplicationPath; filepath += "/Content/Xsl/pubmed.xslt"; string xsl = System.IO.File.ReadAllText(filepath); However, half way down this thread on forums.asp.net there is the following quote HttpContext.Current is evil and if you use it anywhere in your mvc app you are doing something wrong because you do not need it. Whilst I am not using "Current", I am wondering what is the best way to determine the absolute physical path of a file in MVC? For some reason (I don't know why!) HttpContext doesn't feel right for me. Is there a better (or recommended/best practice) way of reading files from disk in ASP.Net MVC? Thanks for your help, Robin

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• Where and how to validate and map ViewModel?

  - by chobo

  Hi, I am trying to learn Domain Driven Design and recently read that lots of people advocate creating a ViewModels for your views that store all the values you want to display in a given view. My question is how should I do the form validation? should I create separate validation classes for each view, or group them together? I'm also confused on what this would look like in code. This is how I currently think validation and viewmodels fit in to the scheme of things: View (some user input) - Controller - FormValidation(of ViewModel) - (If valid map to ViewModel to Domain Model) - Domain Layer Service - Infrastructure Thanks! P.S. I use Asp.net MVC with C#

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• My jquery AJAX POST requests works without sending an Authenticity Token (Rails)

  - by dchua

  Hi all, Is there any provisions in rails that would allow all AJAX POST requests from the site to pass without an authenticity_token? I have a Jquery POST ajax call that calls a controller method, but I did not put any authenticity code in it and yet the call succeeds. My ApplicationController does have 'request_forgery_protection' and I've changed config.action_controller.consider_all_requests_local to false in my environments/development.rb I've also searched my code to ensure that I was not overloading ajaxSend to send out authenticity tokens. Is there some mechanism in play that disables the check? Now I'm not sure if my CSRF protection is working or not. I'm using Rails 2.3.5.

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• Presenting MVC to Old C++ Spaghetti Coders?

  - by leeand00

  I wish to present the idea of MVC to a bunch of old C++ spaghetti coders (at my local computer club). One of them that has alot of influence on the rest of the group seems to finally be getting the idea of encapsulation (largely due in part to this website). I was hoping that I could also point him in the right direction by showing him Model View Controller, but I need to do it in a way that makes sense to him, as well as it probably needs to be written in C/C++! I realize that MVC is a very old architectural pattern so it would seem to me that there should be something out there that would do the job. I'm more of a web developer, so I was wondering if anybody out there who is a good C/C++ coder could tell me what it is that made the MVC light switch turn on in your head.

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• can i change the black background of an iphone app?

  - by Cristi Balu?a

  My app is structured like this, a single MainWindow with window backgroundColor to white(which doesn't appear anywhere anyway), and in this nib i have a UINavigationController which doesn't seems to have a backgroundColor. Any view controller is added from code and made from code and they have a gray background. What happens is that when i rotate the iphone and the views are rotating as well, i see a black background under my views. Can this be changed? It looks ugly especially if i have a photo that is rotating in the same time with my gray background.

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