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• What's the best way to move "a child up" in a .NET XmlDocument?

  - by Mike

  Given an XML structure like this: <garage> <car>Firebird</car> <car>Altima</car> <car>Prius</car> </garage> I want to "move" the Prius node "one level up" so it appears above the Altima node. Here's the final structure I want: <garage> <car>Firebird</car> <car>Prius</car> <car>Altima</car> </garage> So given the C# code: XmlNode priusNode = GetReferenceToPriusNode() What's the best way to cause the priusNode to "move up" one place in the garage's child list?

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• how to force nhibernate to set the foreign key of the child item?

  - by npeBeg

  i have a collection in the mapping: <bag name="Values" cascade="all-delete-orphan" lazy="false" inverse="true"> <key column="[TemplateId]"/> <one-to-many class="MyNamespace.Value, MyLib"/> </bag> the Value object has a foreign key [TemplateId]. both entities has their generator set to "identity". when i call session.Save() for the parent Template object, the Value objects has their [TemplateId] (the foreign key) set to zero, so an SQL exception appears. how do i forse nhibernate to set the FK value for the child items to the value of the inserted parent object?

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• how to select specific number of child entities instead of all in entity framework 3.5?

  - by Sasha

  Hi all, i am wondering how can i select specific number of child objects instead of taking them all with include? lets say i have object 'Group' and i need to select last ten students that joined the group. When i use '.Include("Students"), EF includes all students. I was trying to use Take(10), but i am pretty new to EF and programming as well, so i couldn't figure it out. Any suggestions? UPDATED: ok, i have Group object already retrieved from db like this: Group group = db.Groups.FirstOrDefault(x=>x.GroupId == id) I know that i can add Include("Students") statement, but that would bring ALL students, and their number could be quite big whether i need only freshest 10 students. Can i do something like this: var groupWithStudents = group.Students.OrderByDescending(//...).Take(10);? The problem with this is that Take< no longer appears in intellisense. Is this clear enough? Thanks for responses

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• Can you apply a CSS hover effect to an element that’s not a child of the hovered element?

  - by WilliamB

  I was not sure if this is possible or not. I am working in CSS3 animations right now and I need to hover on a link that will effect other div element(non-child) on the page. I was not sure if there is a work around or not. <style type="text/css"> #header { background-color:red; } #header:hover .element { background-color:blue; } .element { background-color:green; } </style> - <header id="header"> <li><a href="#">Hover</a></li> </header> <div class="element" > <p>hello world </p> </div>

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• Is it possible for a parent to use a child's constant or static variables from inside a static metho

  - by ryeguy

  Below is an example of what I'm trying to do. The parent can't access any of the child's variables. It doesn't matter what technique I use (static or constants), I just need some kind of functionality like this. class ParentClass { public static function staticFunc() { //both of these will throw a (static|const) not defined error echo self::$myStatic; echo self::MY_CONSTANT; } } class ChildClass extends ParentClass { const MY_CONSTANT = 1; public static $myStatic = 2; } ChildClass::staticFunc();

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• In Django, using __init__() method of non-abstract parent model to record class name of child model

  - by k-g-f

  In my Django project, I have a non-abstract parent model defined as follows: class Parent(models.Model): classType = models.CharField(editable=False,max_length=50) and, say, two children models defined as follows: class ChildA(Parent): parent = models.OneToOneField(Parent,parent_link=True) class ChildB(Parent): parent = models.OneToOneField(Parent,parent_link=True) Each time I create an instance of ChildA or of ChildB, I'd like the classType attribute to be set to the strings "ChildA" or "ChildB" respectively. What I have done is added an _ _ init_ _() method to Parent as follows: class Parent(models.Model): classType = models.CharField(editable=False,max_length=50) def __init__(self,*args,**kwargs): super(Parent,self).__init__(*args,**kwargs) self.classType = self.__class__.__name__ Is there a better way to implement and achieve my desired result? One downside of this implementation is that when I have an instance of the Parent, say "parent", and I want to get the type of the child object linked with "parent", calling "parent.classType" gives me "Parent". In order to get the appropriate "ChildA" or "ChildB" value, I need to write a "_getClassType()" method to wrap a custom sql query.

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• how to COPY Attribute value in a new attribute

  - by Mukesh

  How to copy data of attribute to new attribute in the same column in sql original data <root> <child attr='hello'></child> </root> Result 1 <root> <child attr='hello' attr2='hello'></child> </root> Result 2(with a modification) <root> <child attr='hello' attr2='**H**ello **W**orld'></child> </root>

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• Creating multiple process and simulation in C via fork()

  - by Yakup OZDEN

  i want to create multiple process groups which will call different functions. i write the code below. firstly i want to get following output ./fork 4 5 I am a child: 1 PID: 22330 I am a child2: 1 PID: 22334 I am a child: 2 PID: 22331 I am a child2: 5 PID: 22338 I am a child: 4 PID: 22333 I am a child: 3 PID: 22332 I am a child2: 2 PID: 22335 I am a child2: 4 PID: 22337 I am a child2: 3 PID: 22336 ' #include <stdio.h> #include <stdlib.h> #include <unistd.h> void forkChildren (int nChildren) { int i; pid_t pid; for (i = 1; i <= nChildren; i++) { pid = fork(); if (pid == -1) { /* error handling here, if needed */ return; } if (pid == 0) { printf("I am a child: %d PID: %d\n",i, getpid()); sleep (5); wait(NULL); return; } } } void forkChildren2 (int nChildren) { int i; pid_t pid; for (i = 1; i <= nChildren; i++) { pid = fork(); if (pid == -1) { /* error handling here, if needed */ return; } if (pid == 0) { printf("I am a child2: %d PID: %d\n",i, getpid()); sleep (2); return; } } } the code gives me the output [ozdeny@hyperion ~]$ ./fork 4 5 I am a child: 1 PID: 22330 I am a child: 2 PID: 22331 I am a child: 3 PID: 22332 I am a child: 4 PID: 22333 I am a child2: 1 PID: 22334 I am a child2: 2 PID: 22335 I am a child2: 4 PID: 22337 I am a child2: 5 PID: 22338 [ozdeny@hyperion ~]$ I am a child2: 3 PID: 22336 I am a child2: 1 PID: 22339 I am a child2: 2 PID: 22340 I am a child2: 3 PID: 22341 I am a child2: 4 PID: 22342 I am a child2: 5 PID: 22343 I am a child2: 1 PID: 22345 I am a child2: 2 PID: 22346 I am a child2: 3 PID: 22347 I am a child2: 1 PID: 22349 I am a child2: 2 PID: 22350 I am a child2: 1 PID: 22344 I am a child2: 2 PID: 22352 I am a child2: 3 PID: 22353 I am a child2: 4 PID: 22354 I am a child2: 5 PID: 22355 I am a child2: 3 PID: 22351 I am a child2: 4 PID: 22356 I am a child2: 5 PID: 22357 I am a child2: 4 PID: 22348 I am a child2: 5 PID: 22358

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• C signals and processes

  - by Gary

  Hi, so basically I want "cmd_limit" to take a number in seconds which is the maximum time we'll wait for the child process (safe to assume there's only one) to finish. If the child process does finish during the sleep, I want cmd_limit to return pass and not run the rest of the cmd_limit code. Could anyone help me do this, here's what I've got so far.. int cmd_limit( int limit, int pid ) { signal( SIGCHLD, child_died ); sleep( limit ); kill( pid, SIGKILL ); printf("killin'\n"); return PASS; } void child_died( int sig ) { int stat_loc; /* child return information */ int status; /* child return status */ waitpid( -1, &stat_loc, WNOHANG ); if( WIFEXITED(stat_loc) ) { // program exited normally status = WEXITSTATUS( stat_loc ); /* get child exit status */ } printf("child died: %s\n", signal); }

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• Java: Non-static nested classes and instance.super()

  - by Kiv

  I'm having a hard time wrapping my head around non-static nested classes in Java. Consider the following example, which prints "Inner" and then "Child". class Outer { class Inner { Inner() { System.out.println("Inner"); } } } public class Child extends Outer.Inner { Child(Outer o) { o.super(); System.out.println("Child"); } public static void main(String args[]) { new Child(new Outer()); } } I understand that instances of Inner always have to be associated with an Outer instance, and that that applies to Child too since it extends Inner. My question is what the o.super() syntax means - why does it call the Inner constructor? I've only seen a plain super(args) used to call the superclass constructor and super.method() to call the superclass version of an overridden method, but never something of the form instance.super().

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• NHibernate parent-childs save redundant sql update executed

  - by Broken Pipe

  I'm trying to save (insert) parent object with a collection of child objects, all objects are new. I prefer to manually specify what to save\update and when so I do not use any cascade saves in mappings and flush sessions by myself. So basically I save this object graph like: session.Save(Parent) foreach (var child in Parent.Childs) { session.Save(child); } session.Flush() I expect this code to insert Parent row, then each child row, however NHibernate executes this SQL: INSERT INTO PARENT.... INSERT INTO CHILD .... UPDATE CHILD SET ParentId=@1 WHERE Id=@2 This update statement is absolutely unnecessary, ParentId was already set correctly in INSERT. How do I get rid of it? Performance is very important for me.

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• Turn off MDI auto-cascading

  - by Serge

  Hello, I am attempting to automatically add some MDI windows: for (int i = 0; i < a.size; i++) { Form child = new Form(); child.MdiParent = this; child.Location = a.Location[i]; child.Size = a.Size[i]; child.Show(); } Now the size works fine, however the location is always cascaded at the top corner instead of the one that I have set. When I just add a new child form and set location it seems to work fine, however when I do many in a loop they all cascade.

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• In datastore, confused on how to pass a list of key_names as an argument to somemodel.get_or_insert(

  - by indiehacker

  Are there examples of how to pass a list of key_names to Model.get_or_insert() ? My Problem: With a method of ParentLayer I want to make the children. The key_names of the new (or editable) entities of class Child will come from such a list below: namesList = ["picture1","picture2"] so I should be able to build a list of key_names with method from the parent class as follows: class ParentLayer(db.Model): def getOrMakeChildren(self, namesList): keyslist = [ db.Key.from_path( 'Child' , name , parent = self.key() ) for name in namesList ] the problem is next where I simply want to get_or_insert entities based on keylist defined above: childrenEntitiesList = Child.get_or_insert(keyslist) # no works? also none of the below attempts worked: #childrenEntitiesList = Child.get_or_insert(keyslist, parent = u'TEST') #childrenEntitiesList = Child.get_or_insert(keyslist, parent=self.key().name() ) #childrenEntitiesList = Child.get_or_insert(keyslist, parent=self.key()

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• Using Core Data Concurrently and Reliably

  - by John Topley

  I'm building my first iOS app, which in theory should be pretty straightforward but I'm having difficulty making it sufficiently bulletproof for me to feel confident submitting it to the App Store. Briefly, the main screen has a table view, upon selecting a row it segues to another table view that displays information relevant for the selected row in a master-detail fashion. The underlying data is retrieved as JSON data from a web service once a day and then cached in a Core Data store. The data previous to that day is deleted to stop the SQLite database file from growing indefinitely. All data persistence operations are performed using Core Data, with an NSFetchedResultsController underpinning the detail table view. The problem I am seeing is that if you switch quickly between the master and detail screens several times whilst fresh data is being retrieved, parsed and saved, the app freezes or crashes completely. There seems to be some sort of race condition, maybe due to Core Data importing data in the background whilst the main thread is trying to perform a fetch, but I'm speculating. I've had trouble capturing any meaningful crash information, usually it's a SIGSEGV deep in the Core Data stack. The table below shows the actual order of events that happen when the detail table view controller is loaded: Main Thread Background Thread viewDidLoad Get JSON data (using AFNetworking) Create child NSManagedObjectContext (MOC) Parse JSON data Insert managed objects in child MOC Save child MOC Post import completion notification Receive import completion notification Save parent MOC Perform fetch and reload table view Delete old managed objects in child MOC Save child MOC Post deletion completion notification Receive deletion completion notification Save parent MOC Once the AFNetworking completion block is triggered when the JSON data has arrived, a nested NSManagedObjectContext is created and passed to an "importer" object that parses the JSON data and saves the objects to the Core Data store. The importer executes using the new performBlock method introduced in iOS 5: NSManagedObjectContext *child = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType]; [child setParentContext:self.managedObjectContext]; [child performBlock:^{ // Create importer instance, passing it the child MOC... }]; The importer object observes its own MOC's NSManagedObjectContextDidSaveNotification and then posts its own notification which is observed by the detail table view controller. When this notification is posted the table view controller performs a save on its own (parent) MOC. I use the same basic pattern with a "deleter" object for deleting the old data after the new data for the day has been imported. This occurs asynchronously after the new data has been fetched by the fetched results controller and the detail table view has been reloaded. One thing I am not doing is observing any merge notifications or locking any of the managed object contexts or the persistent store coordinator. Is this something I should be doing? I'm a bit unsure how to architect this all correctly so would appreciate any advice.

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• After I appendChild() in ie6, do stylesheets apply to that element?

  - by rickharrison

  I am creating some elements in javascript like so: var parent = document.createElement('div'); parent.setAttribute('id', 'parent'); var child = document.createElement('div'); child.setAttribute('class', 'child'); parent.appendChild(child); otherelement.appendChild(parent); I have a stylesheet which has styles for #parent and .child. However, it appears the styles are being applied to the parent but not the child. Does ie6 only support styles on id's and not classes or am I doing something wrong?

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• .Net Designer assemblies, C++\C# error

  - by greggorob64

  I'm working on an designer-heavy application (using Visual C++ 2.0, but a C# solution should still be relevant). My setup is this: I have a UserControl named "Host" I'm attempting a UserControl named "Child" Child contains a property to a class whose type is defined in a different dll entirely, named "mytools.dll" Child works just fine in the designer. However, when I go to drag "child" onto "host" from the designer, I get the following error: Failed to create component 'Child'. The error message follows: 'System.io.filenotfoundexception: could not load file or assembly MyTools, Version XXXXXX, Culture=neutral ..... {unhelpful callstack} If I comment out the property in "child" that points to the class in mytools.dll, everything designs just peachy. I have the property marked with "Browsable(false), and DesignerSerializable(hidden), and it does not help. Is there a way for me to explicitly say "Don't load this dll, you won't need it in design time", or some way for me to force a dll to load from the designer programmatically? Thanks!

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• runtime/compile time polymorphism

  - by dmadhavaraj

  Hi , In the below code , why b1.subtract() fails . Please explain me the reason ie., what happens in JVM while invoking that method . class Base { public void add() { System.out.println("Base ADD"); } } class Child extends Base { public void add(){ System.out.println("Child ADD"); } public void subtract() { System.out.println("Child Subtract"); } } class MainClass { public static void main(String args[]) { Base b1 = new Base(); Base b2 = new Child(); Child b3 = new Child(); b1.add(); b1.subtract(); // ?????????** b2.add(); b3.subtract(); } }

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• jaxb: How can I bind nested element

  - by user368532

  There is my xml: <parent> <children> <child>1</child> <child>2</child> </children> </parent> I want to have the following Parent class: @XmlRootElement Parent{ @XmlElement(name="children/child") List<Child> children; } I don't want to have class for element 'children'. How should I map field children ?

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• How do I remedy "Error: Cannot find module 'child-process-close'"?

  - by Tyler Sloan

  I was going about business as usual and about to checkout generator-angular-fullstack. I got no red errors but a message a the end saying Error: Cannot find module 'child-process-close'. I tried many a-thing–uninstalling node, reinstalling, manually getting rid of files and directories in local and/or global paths and tried to make sure Homebrew was the one who installed everything and somehow I've made things worse. (Also, I initially saw errors regarding karma. Everything looked right but it doesn't seem I did any good by throwing commands at it.) I am at a loss. All the stackoverflow questions have been clicked and I'm afraid I've probably tried too many of the suggestions. I cannot install any Yeoman generator. I cannot install anything with npm. When inside the project directory when I run npm install it throws the error. I really have no clue. Is there a way I can basically start over all together? A simple uninstall and install isn't cutting it. Something in the system needs to change but I don't know what. Any ideas?

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• How to secure Add child record functionality in MVC on Parent's view?

  - by RSolberg

  I'm trying to avoid some potential security issues as I expose some a new set of functionality into the real world. This is basically functionality that will allow for a new comment to be added via a partialview on the "Parent" page. My comment needs to know a couple of things, first what record is the comment for and secondly who is making the comment. I really don't like using a hidden field to store the ID for the Parent record in the add comment form as that can be easily changed with some DOM mods. How should I handle this? PARENT <% Html.RenderPartial("AddComment", Model.Comments); %> CHILD <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<CommentsViewModel>" %> <% using (Html.BeginForm("AddComment", "Requests")) {%> <fieldset> <legend>New Comment</legend> <%= Html.HiddenFor(p => p.RequestID) %> <%= Html.TextBoxFor(p => p.Text) %> &nbsp; <input type="submit" value="Add" /> </fieldset> <% } %> CONTROLLER [AcceptVerbs(HttpVerbs.Post)] public void AddComment(CommentsViewModel commentsModel) { var user = GetCurrentUser(); commentsModel.CreatedByID = user.UserID; RequestsService.AddComment(commentsModel); }

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• How can I tell the Data Annotations validator to also validate complex child properties?

  - by GWB

  Can I automatically validate complex child objects when validating a parent object and include the results in the populated ICollection<ValidationResult>? If I run the following code: using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; namespace ConsoleApplication1 { public class Person { [Required] public string Name { get; set; } public Address Address { get; set; } } public class Address { [Required] public string Street { get; set; } [Required] public string City { get; set; } [Required] public string State { get; set; } } class Program { static void Main(string[] args) { Person person = new Person { Name = null, Address = new Address { Street = "123 Any St", City = "New York", State = null } }; var validationContext = new ValidationContext(person, null, null); var validationResults = new List<ValidationResult>(); var isValid = Validator.TryValidateObject(person, validationContext, validationResults); Console.WriteLine(isValid); validationResults.ForEach(r => Console.WriteLine(r.ErrorMessage)); Console.ReadKey(true); } } } I get the following output: False The Name field is required. But I was expecting something similar to: False The Name field is required. The State field is required.

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• How to prevent MDI main form closing from MDI Child.

  - by Rekreativc

  Hello! I have a MDI main form. On it I host a form, and I want it to show a message box before it closes (asking the user whether to save changes). So far so good, however I have discovered that closing the MDI main form does not raise a MDI child FormClosing event. I figured I will just call MdiChild.Close() in the MDI main's FormClosing event (which does get raised). This seams to work, however it does causes a problem... In the messagebox that I show, I offer the user to save changes, not to save changes and cancel closing. Normally this works fine, however I can't seem to find a way to cancel MDI main's FormClosing event. Is there a elegant way of doing this? EDIT: I solved this by throwing an exception (when user decides to cancel the closing procedure) which is caught in MDI main's FormClosing event. In this way I know when I have to cancel the MDI main's FormClosing event and this seams to work fine ... However I just can't believe that this "hax" is the only way of doing this. Surely there is a better way?

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• Ruby on Rails: how to get error messages from a child resource displayed?

  - by randombits

  I'm having a difficult time understanding how to get Rails to show explicitly the error messages that a child resource is failing on when I render an XML template. Hypothetically, I have the following classes: class School < ActiveRecord::Base has_many :students validates_associated :students end class Student < ActiveRecord::Base belongs_to :school validates_format_of :email, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i, :message => "You must supply a valid email" end Now, in the controller, let's say we want to build a trivial API to allow us to add a new School with a student in it (again, I said, it's a terrible example, but plays its role for the purpose of the question) class SchoolsController < ApplicationController def create @school = School.new @student = school.students.build @student.email = "bad@email" respond_to do |format| if @school.save # some code else format.xml { render :xml => @school.errors, :status => :unprocessable_entity } end end end end Now the validation is working just fine, things die because the email doesn't match the regex that's set in the validates_format_of method in the Student class. However the output I get is the following: <?xml version="1.0" encoding="UTF-8"?> <errors> <error>Students is invalid</error> </errors> I want the more meaningful error message that I set above with validates_format_of to show up. Meaning, I want it to say: <error>You must supply a valid email</error> What am I doing wrong for that not to show up?

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• Why doesn't keyboard input work for a ScrollViewer when the child control has input focus?

  - by Ashley Davis

  Why doesn't keyboard input work for a ScrollViewer when the child control has input focus? This is the scenario. A WPF window opens. It sets the focus to a control that is embedded in a ScrollViewer. I hit the up and down and left and right keys. The ScrollViewer doesn't seem to handle the key events, anyone know why? This is the simplest possible example: <Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300" FocusManager.FocusedElement="{Binding ElementName=control}" > <Grid> <ScrollViewer HorizontalScrollBarVisibility="Auto" > <ItemsControl x:Name="control" Width="1000" Height="1000" /> </ScrollViewer> </Grid> </Window> When you start the app that contains this window, "control" appears to have the focus as I intended. Pressing the key seems to result in bubbling key events reaching the ScrollViewer (I checked for this using WPF Snoop). I can't work out why it doesn't respond to the input.

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• Why does setting the margin on a div not affect the position of child content?

  - by DanM

  I'd like to understand a little more clearly how css margins work with divs and child content. If I try this... <div style="clear: both; margin-top: 2em;"> <input type="submit" value="Save" /> </div> ...the Save button is right up against the User Role (margin fail): If I change it to this... <div style="clear: both;"> <input style="margin-top: 2em;" type="submit" value="Save" /> </div> ...there is a gap between the Save button and the User Role (margin win): Questions: Can someone explain what I'm observing? Why doesn't putting a margin on the div cause the input to move down? Why must I put the margin on the input itself? There must be some fundamental law of css I am not grasping.

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