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• Sorting an array of structs

  - by keruilin

  I have an array of structs called leaders. The struct class looks like this, for contextual info: class Leader < Struct.new(:rank, :user); end Two questions: How do I sort the array of structs by rank? How do I sort the array of structs by rank and by user.created_at?

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• C++ How fast is passing around objects?

  - by wndsr

  Assuming we are running a compiled C++ binary: Is passing around an int (e.g. function to function, or writing it into variables) slower than passing around structs/class objects like the following? class myClass { int a; int b; char c; vector d; string e; }

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• Internal classes with ADO.NET Entity Framework

  - by Regent

  I'm using Entity Framework for creation of my Data Access Layer and I want for all of my classes to be internal. I know it is possible to manually assign it manually in the designer for each class. But looks like it also requires to set internal modifier for each single property in every class! I have about 30+ entities and it will be a huge work to do. Do you know any ideas how to set a 'default access' for the entire model?

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• Removing an associated object with a link_to to the update action

  - by Numbers

  class Question < ActiveRecord::Base belongs_to :category end class Category < ActiveRecord::Base has_many :questions accepts_nested_attributes_for :questions, allow_destroy: true end CategoriesController: private def category_params params.require(:category).permit(:title, questions_attributes: [:id, :category_id, :title, :_destroy]) end In the view I have a category displaying all it's posts (CategoriesController#show). Each post is deletable. How could I construct a link_to helper that deletes a post by updating the category?

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• Why the only hidden field that is being filled from GET action is not being passed in model?

  - by user1807954

  Sorry for the long title, I didn't know how to make it any shorter. My code: My model: public class CarFilter { public String carMake { get; set; } public String carModel { get; set; } public String carEdition { get; set; } . . . public String SortBy { get; set; } } public class CarSearch : CarFilter { public List<Car> Car { get; set; } } My controller: public ActionResult SearchResult(CarSearch search) { var cars = from d in db.Cars select d; if (Request.HttpMethod == "POST") { search.SortBy = "Price"; } search.Car = new List<Car>(); search.Car.AddRange(cars); var temp = new List<CarSearch>(); temp.Add(search); return View(temp); } My Index view (where user filters results): @model IEnumerable<Cars.Models.CarSearch> @using (Html.BeginForm("SearchResult", "Home", FormMethod.Post)){..forms and other stuff..} My SearchResult view (where user sees the results of filtration): @model IEnumerable<Cars.Models.CarSearch> @using (Html.BeginForm("SearchResult", "Home", FormMethod.Get)) { @Html.Hidden("carMake") @Html.Hidden("carModel") @Html.Hidden("carEdition") . . . @Html.Hidden("SortBy", temp.SortBy) <input name="SortBy" class="buttons" type="submit" value="Make"/> My goal What I'm trying to do is when user clicked on sort by Make it will have to GET back all the variables in hidden field back to the SearchResult action in order to sort the result (same filtered results). Result Is: <input id="SortBy" name="SortBy" type="hidden" value=""/>. The value is null and it's not being passed but all the other hidden fields such as carMake and etc have value. But when I use foreach it works perfect. Question Why is this like this? the SortBy is in the same model class as other fields in the view. The only difference is that SortBy is not being filled in the Index view with other fields, instead it's being filled in controller action. What is the explanation for this? Am I missing any C# definition or something such as dynamic objects or something?

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• My php script only reads the first row from mysql and doesn't check the rest of the rows for matches

  - by RobertH

  I'm trying to write a script for users to register to a club, and it does all the validation stuff properly and works great until it gets to the part where its supposed to check for duplicates. I'm not sure what is going wrong. HELP PLEASE!!! Thank you in Advance, <?php mysql_connect ("sqlhost", "username", "password") or die(mysql_error()); mysql_select_db ("databasename") or die(mysql_error()); $errormsgdb = ""; $errordb = "Sorry but that "; $error1db = "Name"; $error2db = "email"; $error3db = "mobile number"; $errordbe = " is already registered"; $pass1db = "No Matching Name"; $pass2db = "No Matching Email"; $pass3db = "No Matching Mobile"; $errorcount = 0; $qResult = mysql_query ("SELECT * FROM table"); $nRows = mysql_num_rows($qResult); for ($i=1; $i< $nRows+1; $i++){ $result = mysql_query("SELECT id,fname,lname,dob,email,mobile,agree,code,joindate FROM table WHERE fname = '$ffname"); if ($result > 0) { $errorcount = $errorcount++; $passdb = 0; $errormsgdb = $error1db; echo "<div class=\"box red\">$errordb $errormsgdb } else { $pass = 1; $errormsgdb = $pass1db; echo "<div class=\"box green\">$errormsgdb</div><br />"; } //--------------- Check if DB checks returned errors ------------------------------------> if($errorcount <= 0){ $dobp = $_REQUEST['day'].'/'.$_REQUEST['month'].'/'.$_REQUEST['year']; $dob = $_REQUEST['year'].$_REQUEST['month'].$_REQUEST['day']; //header('Location: thankyou.php?ffname='.$ffname.'&flname='.$flname.'&dob='.$dob.'&femail='.$femail.'&fmobile='.$fmobile.'&agree='.$agree.'&code='.$code.'&dobp='.$dobp); echo "<div class='box green'>Form completed! Error Count = $errorcount</div>"; } else { echo "<div class='box red'>There was an Error! Error Count = $errorcount</div>"; } } ?>

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• Django call function when an object gets added

  - by dotty

  Hay, i have a simple model class Manufacturer(models.Model): name = models.CharField() car_count = models.IntegerField() class Car(models.Model): maker = ForeignKey(Manufacturer) I want to update the car_count field when a car is added to a manufacturer, I'm aware i could just count the Manufacturer.car_set() to get the value, but i want the value to be stored within that car_count field. How would i do this? EDIT Would something like this work? def save(self): if self.id: car_count = self.car_set.count() self.save()

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• Java: "implements Runnable" vs. "extends Thread"

  - by user65374

  From what time I've spent with threads in Java, I've found these two ways to write threads. public class ThreadA implements Runnable { public void run() { //Code } } //with a "new Thread(threadA).start()" call public class ThreadB extends Thread { public ThreadB() { super("ThreadB"); } public void run() { //Code } } //with a "threadB.start()" call Is there any significant difference in these two blocks of code?

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• grails: quering in a composite structure

  - by Asaf David

  hey i have the following domain model: class Location { String name static hasMany = [locations:Location, persons:Person] } class Person { String name } so basically each location can hold a bunch of people + "sub-locations". what is the best way to recursively query for all persons under a location (including it's sub locations, and their sub locations, etc')?

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• unable to pas derived List<>

  - by Tarscher

  Hi all, I have class A {} class B : A {} I also have a method that expects a List parameter void AMethod(List<A> parameter) {} Why can't I List<B> bs = new List<B>(); AMethod(bs); And secondly what is the most elegant way to make this work? regards

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• does != nil check for 0x0?

  - by 4thSpace

  I have a custom class and check that a property isn't 0x0 by doing: if(myinstance.someproperty != nil){ //do something } However, even if someproperty is 0x0, I still go into the conditional. someproperty is of another class type. Is there some other way to check this?

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• Which of these choices is the better design for drawing objects?

  - by Adir

  What would be a better parctice, writing the drawing method inside the GameObject class or in the Game class? GameObject obj = new GameObject(); obj.Draw(); Or GameObject obj = new GameObject(); DrawGameObject(obj);

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• How to change link if JS is disable and enable ?

  - by metal-gear-solid

  I need if JS is enabled then this link will be this <a href="#" class="collops">see sitemap</a> And is js is disabled then link should be this <a href="http://stackoverflow.com" class="collops">see sitemap</a>

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• Java-Hibernate-Newbie: How do I acces the values from this list?

  - by Mes

  I have this class mapped @Entity @Table(name = "USERS") public class User { private long id; private String userName; } and I make a query: Query query = session.createQuery("select id, userName, count(userName) from User order by count(userName) desc"); return query.list(); How can I acces the value returned by the query?

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• dynamically add/remove style in javascript

  - by rod

  Hi All, Is there a way in any browser to add/remove class names? For example, if I have a div with class names and I just want to remove/add 'name2' is there a way to do that? Thanks, rodchar

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• Anyway to get string from variable name?

  - by hacksigal

  Say I have my class @interface Person : NSObject { NSString *name; } I need to get the name of NSString's within my class Person *person = [[Person alloc] init]; NSLog(@"Name of variable %s\n", NameofVariable(person.name));

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• how to calculate geometric values in C#

  - by user321182

  i want design a dll for geometric points i have x value and y value from that i have to enter more x value and y value and two x points and two y points means.i have to find the distance...this is one dll then second class library we have to get the points from first class library and calculate slope angel

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• How do I find where a ruby method is declared?

  - by Joe Fair

  I have a ruby method (deactivate!) that is on an activeRecord class. However, I can't seem to find where that method is declared. There have been numerous developers on this project, so it could be anywhere. There is a deactivate! on an unrelated class, but it doesn't seem to get called. Any ideas how to find all the superclasses for an instace, or where to find the code for deactivate!?

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• Problem with retrieveing a stored cookie

  - by Shrewd Demon

  Hey, I wanted to know if we can access the HttpContext class in the App_Code folder. I am asking so because i have a CommonMethods.cs class inside my App_Code folder. I have written a method that checks if a cookie exists on the client machine or not, but it does not return the cookie. Although when i write the same code on the ASPX.cs page i get the cookie!! can anybody clarify me as in whats going on?? thanks

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• Problem when trying to disappear a column

  - by eddy

  I need to hide a column as well as other elements when my page is printed , and in order to do that I have a print style sheet, everything works fine, except for the column I want to make disappear, the strange thing is that my stylesheet works in IE , but it didn't in Mozilla and chrome, why's that? Html code <col width="10%" class="art-editcolumn"/> and here's the CSS class: .art-editcolumn { display: none; } Hope you can help me out with this.

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• WPF inherited UserControl lost VS designer support

  - by PaN1C_Showt1Me

  Hi ! I' written this UserControl: <my:MyUserControl x:Class="MyClass" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:my="clr-namespace:MyNameSpace.MyControls;assembly=MyAssembly"> </my:MyUserControl> public partial class Editor : MyNameSpace.MyControls.MyUserControl {} Everything works, the control is shown in the VS 2008 Designer, but I cannot click directly in the elements and select them as it was with UserControl. Any idea how to solve it?

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• How can I define multiple types with the same name and different type parameters using Reflection Em

  - by wawa

  How can I generate types like these using the System.Reflection.Emit libraries: public class Test<T> {} public class Test<T1, T2> {} When I call ModuleBuilder.DefineType(string) with the second type declaration, I get an exception because there is already another type in the module with the same name (I've already defined the type parameter on the first type). Any ideas?

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• Creating C# Classes at runtime

  - by John Hartsock

  Hello, I have been curious about dynamically create class at runtime in C# and stumbled across this article. http://olondono.blogspot.com/2008/02/creating-code-at-runtime.html I am curious to hear some pros and cons regarding construction of a class at runtime. Any opinions?

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• Is there a clever way to pass the key to defaultdict's default_factory?

  - by Paul Oyster

  A class has a constructor which takes one parameter: class C(object): def __init__(self, v): self.v = v ... Somewhere in the code, it is useful for values in a dict to know their keys. I want to use a defaultdict with the key passed to newborn default values: d = defaultdict(lambda : C(here_i_wish_the_key_to_be)) Any suggestions?

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• How do I restrict the creation of an anonymous subclass (Java)

  - by Ad

  Hi I have an abstract class A in a package P with subclasses B and C. I don't want it to be possible to create an anonymous subclass to the class A from outside the package P.

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