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  • Complex Entity Framework linked-graphs issue: how to limit change set / break the graph?

    - by Hightechrider
    I have an EDMX containing Sentences, and Words, say and a Sentence contains three Words, say. Appropriate FK relationships exist between the tables. I create some words: Word word1 = new Word(); Word word2 = ... I build a Sentence: Sentence x = new Sentence (word1, word2, word3); I build another Sentence: Sentence y = new Sentence (word1, word4, word5); I try to save x to the database, but EF builds a change set that includes everything, including y, word4 and word5 that aren't ready to save to the database. When SaveChanges() happens it throws an exception: Unable to determine the principal end of the ... relationship. Multiple added entities may have the same primary key. I think it does this because Word has an EntityCollection<Sentence> on it from the FK relationship between the two tables, and thus Sentence y is inextricably linked to Sentence x through word1. So I remove the Navigation Property Sentences from Word and try again. It still tries to put the entire graph into the change set. What suggestions do the Entity Framework experts have for ways to break this connection. Essentially what I want is a one-way mapping from Sentence to Word; I don't want an EntityCollection<Sentence> on Word and I don't want the object graph to get intertwined like this. Code sample: This puts two sentences into the database because Verb1 links them and EF explores the entire graph of existing objects and added objects when you do Add/SaveChanges. Word subject1 = new Word(){ Text = "Subject1"}; Word subject2 = new Word(){ Text = "Subject2"}; Word verb1 = new Word(){ Text = "Verb11"}; Word object1 = new Word(){ Text = "Object1"}; Word object2 = new Word(){ Text = "Object2"}; Sentence s1 = new Sentence(){Subject = subject1, Verb=verb1, Object=object1}; Sentence s2 = new Sentence(){Subject=subject2, Verb=verb1, Object=object2}; context.AddToSentences(s1); context.SaveChanges(); foreach (var s in context.Sentences) { Console.WriteLine(s.Subject + " " + s.Verb + " " + s.Object); }

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  • Basic Java Multi-Threading Question

    - by Veered
    When an object is instantiated in Java, is it bound to the thread that instantiated in? Because when I anonymously implement an interface in one thread, and pass it to another thread to be run, all of its methods are run in the original thread. If they are bound to their creation thread, is there anyway to create an object that will run in whatever thread calls it?

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  • C++ exceptions binary compatibility

    - by aaa
    hi. my project uses 2 different C++ compilers, g++ and nvcc (cuda compiler). I have noticed exception thrown from nvcc object files are not caught in g++ object files. are C++ exceptions supposed to be binary compatible in the same machine? what can cause such behavior?

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  • Using RESTful Rails, How to Do an Insert and Create in One Action

    - by Dex
    I have a link on a website that says "add object". When I do this, an AJAX call is made and I want to do the following things: 1) if the container in the session does not exist, create one, else use existing 2) add the object to the container I'm new to RESTful design and am wondering how to best accomplish this in Rails. Step #1 in particular

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  • session value lost in asp.net in c#

    - by Sathis
    hai.. Am doing wepsite for show images from local drive using asp.net.am using session object for Transfer image path from first page to second page its running nice in vs 2003 .but i converted this website to vs 2005.but session value does't pass to next page.i got null value in session object. am using inproc session mode kindly help me thanks

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  • Find Line Above or Below in Javascript

    - by Dark Falcon
    I am working on an in-place HTML editor, concentrating on Firefox only right now. I have an element inserted where the cursor should be and also have left and right arrows working, but I can't seem to find a way to find: Start and end of a line for the home and end keys The next line up or down for the up/down arrows. I see document.elementFromPoint, but this doesn't get me a Range object. The Range object itself seems rather useless when it comes to using pixel positions.

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  • Powershell .CopyHere if it already exists work around

    - by Bruce227
    Hi, I run the following to unzip and want to over write the current files if they exist but the microsoft solution found here(http://msdn.microsoft.com/en-us/library/ms723207%28VS.85%29.aspx) doesn't seem to work. I haven't found anything that says it works so is there a work around to select the 'yes to all' option? $zipPackage = (new-object -com shell.application).NameSpace($zipfilename) $destinationFolder = (new-object -com shell.application).NameSpace($destination) $destinationFolder.CopyHere($zipPackage.Items(),16) Thanks

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  • which is the most secure way to check variables type javascript

    - by mck89
    Hi, i need to check the type of a variable in javascript, i know 3 ways to do it: instanceof operator: if(a instanceof Function) typeof operator: if(typeof a=="function" toString method (jQuery uses this): Object.prototype.toString.call(a) == "[object Function]" Which is the most secure way to do type checking beetween these solutions? and why? Please don't tell me that the last solution is better only because jQuery uses that.

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  • Is it possible to create your own custom locale

    - by smerlin
    Since Windows doesnt have a C++ locale with UTF8 support by default, i would like to construct a custom locale object which supports UTF8 (by creating it with a custom ctype facet). How can i construct a locale object with a my own ctype implementation (i only found functions to construct a locale using an already existing locale as base..) If C++ does not support construction of locales with a custom ctype facet at all, why is that so ?

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  • casting needed?

    - by Joo Park
    what is the difference between these two lines of code? Is there a difference? NSManagedObject* object = (NSManagedObject*)[self.fetchedResults objectAtIndexPath:indexPath]; NSManagedObject* object = [self.fetchedResults objectAtIndexPath:indexPath];

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  • Using Visual Studio Intellisense for building jQuery selector strings

    - by jslatts
    This is a minor issue, but one I find myself running into: When I am using jQuery in Visual Studio 2010, I find myself frequently typing: $(#S using Intellisense to find the SomeID object ID: $(#SomeID).click( function() { etc.. }) then going back and adding quotes: $('#SomeID').click( function() { etc.. }) I find it annoying that if I add the quote first, Visual Studio goes into string mode and I lose Intellisense for finding the object's ID or class. Am I doing it wrong?

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  • Select a random row from table, but with odds?

    - by Don
    I have a table that describes a variety of objects in my system (ie. umbrella, boots, satchel, whatever). Each one of these objects needs to have a distinct prevalence or incidence. For example, the umbrella is rarer than the boots. Based on those factors, I need to randomly select a single object (including a blank or 'no object found') based on that incidence value. Yikes. Make sense?

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  • Problem with jquery-droppable in Chrome

    - by ripper234
    I have a simple application that users jquery-ui's draggable and droppable. In Firefox, it works perfectly. In Chrome, however, I'm having problems. This is the code: $(".cell").droppable({ drop: function(event, ui) { var originalTarget = event.originalTarget; ... } }); In Chrome the 'event' object is of type 'Object' (using Chrome Dev Kit), and event.originalTarget is 'undefined'. What am I doing wrong?

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  • Retrive treeview item

    - by Anu
    Hi, In y treeview i have text,after i seelcted that,i want to retrive that selected item as string and i need to pass this string to various fucntions. I dont know how to get the selected item.I coded like private void treeview1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) { TreeViewItem selectedTVI = null; if (treeview1.SelectedItem != null) { selectedTVI = treeview1.Tag as TreeViewItem; } } But selectedTVi shows NULL.What can i do?

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  • Meteor exception in Meteor.flush when updating a collection breaks reactivity across clients

    - by Harel
    When I'm calling Collection.update from the front end (the method call is allowed), the update does work ok, but the exception below is being thrown (in Chrome's JS console, not in the server). Although the update took place, other clients connected to the same collection do not see the updates until they refresh the browser - I suspect because of the exception. Any idea what might cause this? Exception from Meteor.flush: Error: Can't create second landmark in same branch at Object.Spark.createLandmark (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1085:13) at http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:115:26 at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14) at Object.partial [as list_item] (http://checkadoo.com/packages/templating/deftemplate.js?7f4bb363e9e340dbaaea8d74ac670af40ac82d0a:114:24) at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:349:48 at Object.Spark.labelBranch (http://checkadoo.com/packages/spark/spark.js?8b4e0abcbf865e6ad778592160ec3b3401d7abd2:1030:14) at branch (http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:308:20) at http://checkadoo.com/packages/handlebars/evaluate.js?ab265dbab665c32cfd7ec343166437f2e03f1a54:348:20 at Array.forEach (native) at Function._.each._.forEach (http://checkadoo.com/packages/underscore/underscore.js?772b2587aa2fa345fb760eff9ebe5acd97937243:76:11) EDIT Here is my template for the clickable item that triggers the update: <template name="list_item"> <li class="checklistitemli"> <div class="{{checkbox_class}}" id="clitem_{{index}}"> <input type="checkbox" name="item_checked" value="1" id="clcheck_{{index}}" class="checklist_item_check" {{checkbox_ticked}}> {{title}} </div> </li> </template> and here's the event handler for clicks on 'list_item': var visualCheck = function(el, checked) { var checkId = el.id.replace('clitem','clcheck'); if (checked) { addClass(el, 'strikethrough'); $('') } else { removeClass(el, 'strikethrough'); } $('#'+checkId)[0].checked=checked; }; Template.list_item.events = { 'click .checklistitem' : function(ev) { this.checked = !this.checked; var reverseState = !this.checked; var updateItem = {}, self = this, el = ev.target; visualCheck(el, this.checked); updateItem['items.'+this.index+'.checked'] = this.checked; console.log("The error happens here"); Lists.update({_id: this._id}, {$set:updateItem}, {multi:false} , function(err) { console.log("In callback, after the error"); if (err) { visualCheck(el, reverseState); } }); } } The whole thing is available at http://checkadoo.com (Its a port of a Tornado based Python app of mine)

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  • GAE Datastore: persisting referenced objects

    - by David
    Two "I'm sorries" to begin with: 1) I've looked for a solution (here, and elsewhere), and couldn't find the answer. 2) English is not my mother tongue, so I may have some typos and the sort - please ignore them. To the point: I am trying to persist Java objects to the GAE datastore. I am not sure as to how to persist object having ("non-trivial") referenced object. That is, assume I have the following. public class Father { String name; int age; Vector<Child> offsprings; //this is what I call "non-trivial" reference //ctor, getters, setters... } public class Child { String name; int age; Father father; //this is what I call "non-trivial" reference //ctor, getters, setters... } The name field is unique in each type domain, and is considered a Primary-Key. In order to persist the "trivial" (String, int) fields, all I need is to add the correct annotation. So far so good. However, I don't understand how should I persist the home-brewed (Child, Father) types referenced. Should I: Convert each such reference to hold the Primary-Key (a name String, in this example) instead of the "actual" object. So, Vector<Child> offsprings; becomes Vector<String> offspringsNames; ? If that is the case, how do I handle the object at run-time? Do I just query for the Primary-Key from Class.getName, to retrieve the refrenced objects? Convert each such reference to hold the actual Key provided to me by the Datastore upon the proper put() operation? So, Vector<Child> offsprings; becomes Vector<Key> offspringsHashKeys; ? I would very much appreciate all kinds of comments. I have read ALL the offical relevant GAE docs/example. Throughout, they always persist "trivial" references, natively supported by the Datastore (e.g. in the Guestbook example, only Strings, and Longs). Many thanks, David

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  • What's the right way to communicate between 2 or more .Net applications running on a same computer w

    - by Ivan
    If my applications run on a same computer or even on different computers in a same LAN and need intense and quick communication, it seems illogical for me to use text-encoded web services and HTTP. I could possibly use IP/TCP/UDP sockets and invent my own protocols, but believe there is a standard way for .Net applications to send/receive object instances (and, maybe, even sharing an object by reference?). Can you tell me what's that standard way? I am only interested in .Net Framework 4 applications and don't need to support legacy frameworks.

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  • Using auto-generated event handler in both class and it's superclass

    - by abatishchev
    I have a abstract class: public abstract class MySuperControl : UserControl { protected void Page_PreRender(object sender, EventArgs e) { // do something in super } } and a class that is code-behind for a designed UserControl: public partial class MyControl : MySuperControl { protected void Page_PreRender(object sender, EventArgs e) { // do something in class } } how do declare both of them to nest automated call?

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  • Getting all the fields and properties of a custom attribute from a specific instance

    - by Gbps
    I have a custom attribute PackerAttrib which takes no data, simply marking a field or property, which will be used to mark a property or field of a class inherited from Panel in order to serialize it later on. How would I take an instance of any object derived from Panel and get a Directory<string s, object o> where s is the name of the field or property and o is the current value of said field or property from the instance. Thank you, don't be afraid to ask me to clarify!

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  • How to edit the code table for one row only?

    - by TomatoSandwich
    I understand that dw-control.Object.columnname.Values("Red~tR/Blue~tB) changes columnname's values for all rows, but is there code that can just change the dropdown values of a code table for specific row/s? I've tried dw-control.Object.columnname[row].Values but I get R0039 in response :(

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