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Elegant solution to reordering a Laravel Collection (or populate it perfectly from the beginning)?


Elegant solution to reordering a Laravel Collection (or populate it perfectly from the beginning)?

By : user2954304
Date : November 22 2020, 01:01 AM
this one helps. I don't think it is perfect but it works.
This code assumes $collection is the collection you want to reorder
code :
$arrayCollection = array();

$numberOfColumns = 5; // adjust this value to change number of columns
$numberOfRows = $collection->count() / $numberOfColumns

foreach($collection as $index => $model){
    $column = floor($index / $numberOfRows);
    $newIndex = (int)($index % $numberOfRows) * $numberOfColumns + $column;
    $arrayCollection[$newIndex] = $model;
}

ksort($arrayCollection); // sort collection by key

$collection = new Collection($arrayCollection); // make new collection with reordered models


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Clean elegant solution to form-class level component collection initializing before Initialize Component?

Clean elegant solution to form-class level component collection initializing before Initialize Component?


By : bkaddy
Date : March 29 2020, 07:55 AM
may help you . This is not thread safe, but works very well for my purposes:
Solution in use:
code :
 Private _formattedFormulaText As New Lazy(Of IEnumerable(Of Label))(Function() New List(Of Label) From { _
 FormulaLabels0, FormulaLabels1, lblBrownFormula, FormulaLabels3, lblGreenFormula, _
      lblOrangeFormula, lblSRedFormula, FormulaLabels7, lblFormulaTotal})
Dim clearText = Sub(c As Control) c.Text = String.Empty
        _formattedFormulaText.ToList.ForEach(clearText)
Dim clearText = Sub(c As Control) c.Text = String.Empty
        _formattedFormulaText.Value.ToList.ForEach(clearText)
   Private ReadOnly Property FormattedText As IEnumerable(Of Label)
        Get
            Return _formattedFormulaText.Value
        End Get
    End Property
''' <summary>
''' translated from http://msdn.microsoft.com/en-us/vcsharp/bb870976.aspx
''' </summary>
Public Class Lazy(Of T)
    Private _func As Func(Of T)
    Private _result As T
    Private _hasValue As Boolean
    Public Sub New(ByVal func As Func(Of T))
        _func = func
        _hasValue = False
    End Sub
    Public ReadOnly Property Value As T
        Get
            If Me._hasValue = False Then
                _result = _func()
                _hasValue = True
            End If
            Return _result
        End Get
    End Property

End Class
assembly\NativeImages_v4.0.30319_32\mscorlib\246f1a5abb686b9dcdf22d3505b08cea\mscorlib.ni.dll
PHP add to beginning of array without reordering

PHP add to beginning of array without reordering


By : user2830547
Date : March 29 2020, 07:55 AM
Hope this helps Since you don't want to change the numerical indexes i assume array_unshift will not work.
So maybe if you know the indexes you could do it like that:
code :
$x = array(1 => 1, 2 => 2, 3 => 3); 
$y = array(1101 => 123);
var_dump( $y + $x );

/* Output:
array(4) {
  [1101]=>
  int(123)
  [1]=>
  int(1)
  [2]=>
  int(2)
  [3]=>
  int(3)
}
*/
$x = array(1 => "Hello", 2 => "Welt"); 
$y = array("" => "");

var_dump($y + $x);

/*
array(3) {
  [""]=>
  string(0) ""
  [1]=>
  string(5) "Hello"
  [2]=>
  string(4) "Welt"
}
*/
Prepend an item at the beginning of each element of an Eloquent collection of Laravel

Prepend an item at the beginning of each element of an Eloquent collection of Laravel


By : user3501282
Date : March 29 2020, 07:55 AM
I wish this helpful for you Those items are just objects and you can add a property by just setting it:
code :
$new = $objectives->map(function($objective){
    $objective->foo = 'bar';
    return $objective;
});
Looking for elegant / efficient solution for integer keyed collection of models

Looking for elegant / efficient solution for integer keyed collection of models


By : geekgirl
Date : March 29 2020, 07:55 AM
may help you . The "AddToLeg" method seems long winded is there a better pattern or more efficient way to implement this? I thought about using a dictionary but I want the key to remain an integer. I'm pretty new to linq / generics so I maybe missing something more obvious. When I've looked through documentation there aren't really any examples that match my scenario. , Use Dictionary for this task:
code :
    public class TrainspotterItenaryViewModel
    {
        private Dictionary<int, Leg> _legNumberToLegIndex { get; set; }

        public IEnumerable<Leg> Legs => _legNumberToLegIndex?.Values

        public void AddToLeg(int legNumber, Station station)
        {
            if (_legNumberToLegIndex == null)
            {
                _legNumberToLegIndex = new Dictionary<int, Leg>();
            }

            Leg leg;
            if (!_legNumberToLegIndex.TryGetValue(legNumber, out leg))
            {
                leg = new Leg
                {
                    LegNumber = legNumber,
                    Stations = new List<Station>()
                };
                _legNumberToLegIndex.Add(legNumber, leg);
            }
            leg.Stations.Add(station);
        }
    }
Attempt to begin reordering on collection view while reordering is already in progress

Attempt to begin reordering on collection view while reordering is already in progress


By : Claudia Gallegos
Date : March 29 2020, 07:55 AM
wish of those help Ending any interactive movement in the drop location (UICollectionView) when initiating a new drag fixed my problem. I had to modify my UICollectionViewDragDelegate method as follows,
code :
    func collectionView(_ collectionView: UICollectionView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {

    var item: Item?
    if collectionView.tag == CollectionView.media.rawValue {
        item = mediaItems[indexPath.row]

// New line to fix the problem. 'timeline' is the IBOutlet of the UICollectionView I'm going to drop the item
        timeline.endInteractiveMovement()

    } else {
        item = StoryManager.sharedInstance.timelineItems[indexPath.row]

// New line to fix the problem. 'media' is the IBOutlet of the UICollectionView I'm going to drop the item
        media.endInteractiveMovement()

    }

    if let item = item {
        let itemProvider = NSItemProvider(object: item.id as NSString)
        let dragItem = UIDragItem(itemProvider: itemProvider)
        dragItem.localObject = item
        return [dragItem]
    }
    return []
}
override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

// 'media' and 'timeline' are the IBOutlets of the UICollectionViews I have implemented drag and drop
    timeline.endInteractiveMovement()
    media.endInteractiveMovement()
}
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