The usage of NSNotificationCenter in the relationship of parent and children

The usage of NSNotificationCenter in the relationship of parent and children

By : user2956394
Date : November 22 2020, 10:56 AM
around this issue OK so lets say that you register for notifications in the viewDidLoad method (I'm assuming you're using UIViewController) in Class A; and deregistering for notifications in the viewWillDisappear: method. Then as long as you call super in your subclass' (Class B) equivalent methods then your class will receive these notifications.
In order to respond to these notifications you create a method, defined in the .h file of the superclass (Class A) called didEnterForeground and you set this as the selector to be called when your superclass receives the notification. All you have to do is implement didEnterForeground in your subclass (Class B) in order to respond to notifications.
code :

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Parent/children relationship in ruby?

Parent/children relationship in ruby?

By : Qua
Date : March 29 2020, 07:55 AM
this one helps. This is a strong composition, where the component couldn't be built without a reference to the composite.
That means you need to initialized them with that composite (i.e. pass self to the Bar instance). This is the way to do it, as you need a reference to the owner. You can possibly set it after, for instance bar.foo = foo, but it will implement a looser link, an aggregation.
code :
class Bar # Class of the component
  attr_reader :foo

  # the component must be initialized/built
  # with a ref to the composite foo
  def initialize(name, foo) 
    @name = name
    @foo = foo

class Foo # Class of the composite
  attr_reader :children

  def initialize(names = %w(john ben maudy))
    @children = names.map do |n|
      Bar.new(n, self) # pass self to build the component

bar = Foo.new.children.first
How to update parent and all children of One-to-Many relationship?

How to update parent and all children of One-to-Many relationship?

By : Randal
Date : March 29 2020, 07:55 AM
I hope this helps . To make MVC map your post data correctly, you have to change your view code to:
code :
@Html.HiddenFor(model => model.ID);
@Html.EditorFor(model => model.ReportDate);

@for (var i; i < Model.LineItems.Count; i++)
    @html.HiddenFor(e => Model.LineItems[i].ID);
    @html.EditorFor(e => Model.LineItems[i].ItemDescription);
public ActionResult Edit(Report raport)
    if (ModelState.IsValid)
        //do save stuff
Nesting a parent child relationship in lodash, given the parent id and children

Nesting a parent child relationship in lodash, given the parent id and children

By : AAlvarado
Date : March 29 2020, 07:55 AM
will be helpful for those in need This is my take on the question (fiddle):
code :
var data = getData();

var group = getTree(data);


function getTree(flat) {
    return _.reduce(flat, function (treeObj, item, prop, flatTree) {
        var children = _.map(item.children, function (childId) {
            return _.set(flatTree[childId], 'isCategory', true);
        }).concat(_.map(item.items, function(item) {
            return _.set(item, 'isCategory', false);

        item.children = !!children.length ? children : null;

        delete item.items;

        item.parent === null && (treeObj[prop] = item);

        return treeObj;
    }, {});
Parent And Children Relationship

Parent And Children Relationship

By : user3791426
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , For the beginning read some theory Composite Design Pattern
SQL Server - Get a parent row, and all his children, in a relationship 1: n

SQL Server - Get a parent row, and all his children, in a relationship 1: n

By : Vecham Karunakar
Date : March 29 2020, 07:55 AM
it fixes the issue You really shouldn't ever want to do this via sql; it's not what sql is intended to accomplish. That kind of result should be handled in client code, at the presentation level. I'm guessing you just don't understand how to consume the resultset properly yet. What do you plan to do with the result set that you wouldn't want the authorname repeated for each row?
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