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  • Should an NSLock instance be "global"?

    - by Alex Reynolds
    Should I make a single NSLock instance in the application delegate, to be used by all classes? Or is it advisable to have each class instantiate its own NSLock instance as needed? Would the locking work in the second case, if I, for example, had access to a managed object context that is spread across two view controllers?

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  • MVC model flow?

    - by fuzzygoat
    I am setting up an application using the MVC model and I have a query regrading the flow of information from the UI to the data model. What I need to do is place data from the UI in the model, what I have done is write a method in the view which collects the required data in an object and then passes it to the model. The model then takes ownership of the data so that the view can release its ownership. Does this sound sensible?

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  • add text to the choice_label of ChoiceField in Django

    - by pablo
    The ChoiceField creates a select html element and the options show the choice_label which is the _unicode_ of each model object. How can I change the text of the choice_label without modifying _unicode_ ? I have a Product model and I want to show in the options text the product name + price + link to edit. I've searched in fields.py and widgets.py but couldn't find what needed to be changed. Thanks

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  • .NET WinForms INotifyPropertyChanged updates all bindings when one is changed. Better way?

    - by Dave Welling
    In a windows forms application, a property change that triggers INotifyPropertyChanged, will result in the form reading EVERY property from my bound object, not just the property changed. (See example code below) This seems absurdly wasteful since the interface requires the name of the changing property. It is causing a lot of clocking in my app because some of the property getters require calculations to be performed. I'll likely need to implement some sort of logic in my getters to discard the unnecessary reads if there is no better way to do this. Am I missing something? Is there a better way? Don't say to use a different presentation technology please -- I am doing this on Windows Mobile (although the behavior happens on the full framework as well). Here's some toy code to demonstrate the problem. Clicking the button will result in BOTH textboxes being populated even though one property has changed. using System; using System.ComponentModel; using System.Drawing; using System.Windows.Forms; namespace Example { public class ExView : Form { private Presenter _presenter = new Presenter(); public ExView() { this.MinimizeBox = false; TextBox txt1 = new TextBox(); txt1.Parent = this; txt1.Location = new Point(1, 1); txt1.Width = this.ClientSize.Width - 10; txt1.DataBindings.Add("Text", _presenter, "SomeText1"); TextBox txt2 = new TextBox(); txt2.Parent = this; txt2.Location = new Point(1, 40); txt2.Width = this.ClientSize.Width - 10; txt2.DataBindings.Add("Text", _presenter, "SomeText2"); Button but = new Button(); but.Parent = this; but.Location = new Point(1, 80); but.Click +=new EventHandler(but_Click); } void but_Click(object sender, EventArgs e) { _presenter.SomeText1 = "some text 1"; } } public class Presenter : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; private string _SomeText1 = string.Empty; public string SomeText1 { get { return _SomeText1; } set { _SomeText1 = value; _SomeText2 = value; // <-- To demonstrate that both properties are read OnPropertyChanged("SomeText1"); } } private string _SomeText2 = string.Empty; public string SomeText2 { get { return _SomeText2; } set { _SomeText2 = value; OnPropertyChanged("SomeText2"); } } private void OnPropertyChanged(string PropertyName) { PropertyChangedEventHandler temp = PropertyChanged; if (temp != null) { temp(this, new PropertyChangedEventArgs(PropertyName)); } } } }

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  • How to have member variables and public methods in a jQuery plugin?

    - by user169867
    I'm trying to create a jQuery plugin that will create something like an autoCompleteBox but with custom features. How do I store member variables for each matching jQuery element? For example I'll need to store a timerID for each. I'd also like to store references to some of the DOM elements that make up the control. I'd like to be able to make a public method that works something like: $("#myCtrl").autoCompleteEx.addItem("1"); But in the implementation of addItem() how can I access the member variables for that particular object like its timerID or whatever? Below is what I have so far... Thanks for any help or suggestions! (function($) { //Attach this new method to jQuery $.fn.autoCompleteEx = function(options) { //Merge Given Options W/ Defaults, But Don't Alter Either var opts = $.extend({}, $.fn.autoCompleteEx.defaults, options); //Iterate over the current set of matched elements return this.each(function() { var acx = $(this); //Get JQuery Version Of Element (Should Be Div) //Give Div Correct Class & Add <ul> w/ input item to it acx.addClass("autoCompleteEx"); acx.html("<ul><li class=\"input\"><input type=\"text\"/></li></ul>"); //Grab Input As JQ Object var input = $("input", acx); //Wireup Div acx.click(function() { input.focus().val( input.val() ); }); //Wireup Input input.keydown(function(e) { var kc = e.keyCode; if(kc == 13) //Enter { } else if(kc == 27) //Esc { } else { //Resize TextArea To Input var width = 50 + (_txtArea.val().length*10); _txtArea.css("width", width+"px"); } }); }); //End Each JQ Element }; //End autoCompleteEx() //Private Functions function junk() { }; //Public Functions $.fn.autoCompleteEx.addItem = function(id,txt) { var x = this; var y = 0; }; //Default Settings $.fn.autoCompleteEx.defaults = { minChars: 2, delay: 300, maxItems: 1 }; //End Of Closure })(jQuery);

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  • jqgrid button editing

    - by Sasha
    Hi all, another question about jqgrid. I have a jqgrid table and i have a button in each row. When user clicks on that button, i need to call an action in my mvc controller and i need to change value of my object's field from true to false or opposite and then reload grid. What is the best way to implement this? Thanks.

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  • isnt as a c# keyword

    - by Mikael
    To check if an object is of a certain class one can write: if (item is Class) why isn't the opposite possible? if (item isnt Class) instead one would write if (!(item is Class) which isn't as easy to read as if "isnt" was a keyword just as "is" is. Is there something that makes it so that only "is" should be available or has "isnt" just been forgotten about?

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  • Castle Interceptor Live Cycle and Memory Leak

    - by ktutnik
    Hello all, im new to castle dynamic proxy, and a bit curious.. when creating proxy of my object i save all the original value of its property on the interceptor (class scope) using dictionary and return the new value. now i wandering, when will this data get collected by GC?? can i control it or depends on the interceptor live cycle? Regards Kin

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  • Lazy property loading in Nhibernate and Spring

    - by Khash
    I'm using NHibernate 2.1.2 and Spring 1.3 I have two Text columns (blobs) in one of my classes. I'm trying to use lazy="true" for the mapping of those properties but NHProfiler still shows the two columns being added to the SELECT statement when the main object is loaded. I'm using Spring.NHibernate session factory and have configured ProxyFactory with both Castle and Spring with no luck.

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  • Write xml file using lxml library in Python

    - by systempuntoout
    I'm using lxml to create an XML file from scratch; having a code like this: from lxml import etree root = etree.Element("root") root.set("interesting", "somewhat") child1 = etree.SubElement(root, "test") How do i write root Element object to an xml file using write() method of ElementTree class?

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  • Check if I can execute some sql-command

    - by Alexander Stalt
    I'm using ADO .NET and MS SQL Server 2008. I have a connection object to a server and a command: SqlConnection conn = /* my connection*/; string cmd = "some_sql_command"; I want to check if SQL Server can execute cmd. I don't want to execute cmd, but I want to know If SQL Server can execute it. cmd can be any single SQL statement, it's not a procedure, transaction or multiple commands etc..

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  • Reference data using @ModelAttribute

    - by Eqbal
    I am trying to populate couple of select lists on a form and I am using @ModelAttribute to annotate the get method for these lists. I am getting an exception when I try to access the resource: java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'command' available as request attribute

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  • Stack Trace of cross-thread exceptions with Invoke

    - by the_lotus
    When an exception happens after calling Invoke, .NET shows the stack trace as if the error happens while calling Invoke. Example below: .NET will say the error happen in UpdateStuff instead of UpdateStuff - BadFunction Is there a way to catch the "real" exception and show the correct stack trace? Private Sub UpdateStuff() If (Me.InvokeRequired) Then Me.Invoke(New UpdateStuffDelegate(AddressOf UpdateStuff)) Return End If Badfunction() End Sub Private Sub BadFunction() Dim o As Object o.ToString() End Sub

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  • How can I make WWW:Mechanize to not fetch pages twice?

    - by planetp
    I have a web scraping application, written in OO perl. There's single WWW::Mechanize object used in the app. How can I make it to not fetch the same url twice, i.e. make the second get() with the same url nop: my $mech = WWW::Mechanize->new(); my $url = 'http:://google.com'; $mech->get( $url ); # first time, fetch $mech->get( $url ); # same url, do nothing

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  • load multiple directions in parallel in google map

    - by Maneesh
    My aim is to get distance between many locations thru GDirection object. Since I am using multiple objects, am not able to get distnace. Can someone help me out. Below is the code. for(ct=0;ct<size;ct++) { var gd=new GDirections(); gd.load("from: " + address + " to: " + offaddress[ct]); GEvent.addListener(directions,"load", function() { sor[ct]= gd.getDistance().html; }

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  • Rails, Deleting Children without Deleting Parent using :has_many

    - by Dex
    I have a model called MyContainer, which :has_many MyObjects. I want to delete all the MyObjects in the container without having to delete the MyContainer. My model does have :dependent = :destroy, however I don't want to have to delete and re-create the object because it is slower. Something like this does not work: @obj = MyContainer.find_by_id(10) @obj.my_objects.delete_all How can I accomplish this?

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  • NSManagedObject relationship undo

    - by Reflog
    I have a NSManagedObject ObjA that has a many-to-many relationship with another NSManagedObject ObjB. I initialize it with [NSEntityDescription insertNewObjectForEntityForName:@"ObjA" inManagedObjectContext:app.context]; When I perform undo without performing save - the object is not added to the persistent store. But - when I add an item to the collection inside ObjA and then perform undo - the ObjA is not added, but ObjB is not, it's still lingering in the persisten store for some reason. Any ideas what am I doing wrong?

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  • Long Running Stored Proc - Report Progress Using BackgroundWorker & Timer

    - by daveywc
    While a long running stored proc (RMR_Seek) is executing (called via a Linq-To-SQL data context) I am trying to call another stored proc (RMR_GetLatestModelMessage) to check a table for the latest status message. The long running stored proc updates the table in question with status messages as it executes. I want to display the status message on a message panel to advise the user of the status of the execution of Proc_A. For various reasons it is not possible to determine how long RMR_Seek will take to execute so a progress bar with percentage increments is not feasible. I thought I'd found the way to do it by calling the long running stored proc from in a BackgroundWorker process DoWork event handler. This worked fine and allowed me to update my message panel with some dummy status messages that were NOT obtained via Proc_B while Proc_A was running. However now that I have tried to implement this fully by calling Proc_B to obtain the status messages I am running into problems that seem to be related to the mix of the backgroundworker and my System.Windows.Forms.Timer. An extract of the code I am using is below. I have tried many different ways around this but each one seems to present its own set of problems. The code below is problematic in the bw_DoWork event. The RMR_Seek stored proc gets called but does not execute properly - it also seems to be inconsistent as to whether _IsCompleted gets set to true. I'm sure there is a better way to achieve what I am trying to do. private bool _IsCompleted; private void RunRevenueSeek() { if (_SelectedModel == null) { MessageBox.Show("Please select a model from the list and try again.", "Model Generation", MessageBoxButtons.OK, MessageBoxIcon.Information); } else { var bw = new BackgroundWorker(); bw.DoWork += new DoWorkEventHandler(bw_DoWork); ProgressPanelControl.Visible = true; _IsCompleted = false; MessageTimer.Start(); // Has an interval of 3000 bw.RunWorkerAsync(); ProgressLabelControl.Text = "Refreshing Data"; this.Update(); ...more code goes here } } private void bw_DoWork(object sender, DoWorkEventArgs e) { using (var dc = new RevMdlrDataClassesDataContext()) { dc.CommandTimeout = 300; dc.RMR_Seek(_SelectedModel.ModelSet_ID); _IsCompleted = true; } } private void MessageTimer_Tick(object sender, EventArgs e) { string message = ""; if (_IsCompleted) { MessageTimer.Stop(); } else { using (var dc = new RevMdlrDataClassesDataContext()) { dc.CommandTimeout = 300; dc.RMR_GetLatestModelMessage(_SelectedModel.ModelSet_ID, ref message); ProgressLabelControl.Text = message; this.Update(); } } }

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  • Setting DataReader = nothing

    - by tanmay
    Hi all, In my project I have seen that at many places developer has just nullify the DataReader object after use and hasn't close or dispose.. I want to know the advace effect of doing so, I mean nullifying the datareader and not closeing them. Thanks and Regards, Tanmay.

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