quite a noob in Laravel and Livewire, I guess if there is a better way to accomplish what I have here:
I have some checkboxes in a Livewire view that allow the user to dynamically choose how to filter the data being shown in a HTML table.
On the controller I have an eloquent query that retrieves a subset of the records in the db whenever a checkbox changes state.
Like this (I tried to simplify the structure):
$filtered_items = Item::select('item_color', 'item_quantity', 'item_value')
->whereIn('item_color', [ /* array controlled by checkboxes values in view */ ])
->get();
I need to also show the sums of some columns for that specific filter setup.
As I don't want to make new queries, I try to work on the already available collection with a ->sum() for each column I want to sum:
$sums['item_quantity'] = $filtered_items->sum('item_quantity');
$sums['item_value'] = $filtered_items->sum('item_value');
It works as intended, as I have an array with the sums, but I was wondering if there is a better way to do this, or even write a function to get more columns sum at once, maybe passing an array.
Thanks for any idea or link!
Here is an example of a single query for all sums (two in this example)
$filtered_items = \DB::table('items')
->selectRaw('SUM(item_quantity) as sum_quantity, SUM(item_value) as sum_value')
->whereIn('item_color', [ /* array controlled by checkboxes values in view */ ])
->first();
The advantage is that it will return one entry/row instead of a collection of all the items which is way faster.
Related
I am trying to build a custom sorting for the product listings in shopware 6.
I want to include a foreign table (entity is: leasingPlanEntity), get the min of one of the fields of that table (period_price) and then order the search result by that value.
I have already built a Subscriber, and try it like that, what seems to work.
public static function getSubscribedEvents(): array
{
return [
//ProductListingCollectFilterEvent::class => 'addFilter'
ProductListingCriteriaEvent::class => ['addCriteria', 5000]
];
}
public function addCriteria(ProductListingCriteriaEvent $event): void
{
$criteria = $event->getCriteria();
$criteria->addAssociation('leasingPlan');
$criteria->addAggregation(new MinAggregation('min_period_price', 'leasingPlan.periodPrice'));
// Sortierung hinzufügen.
$availableSortings = $event->getCriteria()->getExtension('sortings') ?? new ProductSortingCollection();
$myCustomSorting = new ProductSortingEntity();
$myCustomSorting->setId(Uuid::randomHex());
$myCustomSorting->setActive(true);
$myCustomSorting->setTranslated(['label' => 'My Custom Sorting at runtime']);
$myCustomSorting->setKey('my-custom-runtime-sort');
$myCustomSorting->setPriority(5);
$myCustomSorting->setFields([
[
'field' => 'leasingPlan.periodPrice',
'order' => 'asc',
'priority' => 1,
'naturalSorting' => 0,
],
]);
$availableSortings->add($myCustomSorting);
$event->getCriteria()->addExtension('sortings', $availableSortings);
}
Is this already the right way to get the min(periodPrice)? Or is it taking just a random value out of the leasingPlan table to define the sort-order?
I didn't find a way, to define the min_period_price aggregate value in the $myCustomSorting->setFields Methods.
Update 1
Some days later, I asked a less complex question in the shopware community on slack:
Is it possible to use the DAL to define a subquery for an association in the product-listing?
It should generate something like:
FROM
JOIN (
SELECT ... FROM ... WHERE ... GROUP BY ... ORDER BY ...
) AS ...
The answer there was:
Don't think so
Update 2
I also did an in-deep anlysis of the DAL-Query-Builder, and it really seems to be not possible, to perform a subquery with the current version.
Update 3 - Different approach
A different approach might be, to define custom fields in the main entity. Every time a change is made on the main entity, the values of this custom fields should be recalculated.
It is a lot of overhead work, to realize this. Especially when the fields you are adding, are dependend on other data like the availability of a product in the store, for example.
So check, if it is worth the extra work. Would be better, to have a solution for building subqueries.
Unfortunately it seems that in your case there is no easy way to achieve this, if I understand the issue correctly.
Consider the following: for each product you can have multiple leasingPlan entities, and I assume that for a given context (like a specific sales channel or listing) that still holds. This means that you would have to sort the leasingPlan entities by price, then take the one with the lowest price, and then sort the products by their lowest-price leasingPlan's price.
There seems to be no other way to achieve that, and unfortunately for you, sorting is applied at the end, even if it is sort of a subquery.
So, for example, if you have the following snippet
$criteria = $event->getCriteria();
$criteria->addAssociation('leasingPlan');
$criteria->getAssociation('leasingPlan')
->addSorting(new FieldSorting('price', FieldSorting::ASCENDING))
->setLimit(1)
;
The actual price-sorting would be applied AFTER the leasingPlan entities are fetched - essentially the results would be sorted, meaning that you would not get the cheapest leasing plan per product, instead getting the first one.
You can only do something like that with filters, but in this case there is nothing to filter by - I assume you don't have one leasingPlan per SalesChannel or per language, so that you could limit that list to just one entry that could be used for sorting
That is not to mention that this could not be included in a ProductSortingEntity, but you could always work around that by plugging into the appropriate events and modifying the criteria during runtime
I see two ways to resolve your issue
Making another table which would store the cheapest leasingPlan per product and just using that as your association
Storing the information about the cheapest leasingPlans in e.g. cache and using that for filtering (caution: a mistake here would probably break the sorting, for example if you end up with too few or too many leasingPlans per product)
public function applyCustomSorting(ProductListingCriteriaEvent $event): void
{
// One leasingPlan per one product
$cheapestLeasingPlans = $this->myCustomService->getCheapestLeasingPlanIds();
$criteria = $event->getCriteria();
$criteria->addAssociation('leasingPlan');
$criteria->getAssociation('leasingPlan')
->addSorting(new FieldSorting('price', FieldSorting::ASCENDING))
->addFilter(new EqualsAnyFilter('id', $cheapestLeasingPlans))
;
}
And then you could sort by
$criteria->addSorting(new FieldSorting('leasingPlan.periodPrice', FieldSorting::ASCENDING));
There should be no need to add the association manually and to add the aggregation to the criteria, that should happen automatically behind the scenes if your custom sorting is selected in the storefront.
For more information refer to the official docs.
I have a challenge that if I want to sort the records when getting using Laravel's ORM based on a list of IDs, how should I do it?!!!!!!!
I mean :
Suppose we have a table called users, which contains 100 records and each record has a unique ID.
We also have an array of IDs.
$ids = [4,1,2,3]
Now I want to get the list of users, but only the users who are first in the ids array and secondly according to the same order as they are listed in this array.
User::whereIn('id' , $Ids)->sortBy('id',$ids)->get();
Can you think of a solution to do this?
User::whereIn('id' , $Ids)->sortBy('id',$ids)->get();
The collections sortBy() function can take a custom call back this way:
$users = User::whereIn('id', $Ids)->get()
->sortBy(function($user, $key) use($ids) {
return array_search($user->id, $ids);
});
This will sort your collection according to the given array.
You can also reference the docs for more information.
Note that the sortBy() function must act upon a collection, which means that the get() function must come before it.
In my Laravel 5.1 app, I have classes Page (models a webpage) and Media (models an image). A Page contains a collection of Media objects and this relationship is maintained in a "media_page" pivot table. The pivot table has columns for page_id, media_id and sort_order.
A utility form on the site allows an Admin to manually associate one or more Media items to a Page and specify the order in which the Media items render in the view. When the form submits, the Controller receives a sorted list of media ids. The association is saved in the Controller store() and update() methods as follows:
[STORE] $page->media()->attach($mediaIds);
[UPDATE] $page->media()->sync($mediaIds);
This works fine but doesn't allow me to save the sort_order specified in the mediaIds request param. As such, Media items are always returned to the view in the order in which they appear in the database, regardless of how the Admin manually ordered them. I know how to attach extra data for the pivot table when saving a single record, but don't know how to do this (or if it's even possible) when passing an array to attach() or sync(), as shown above.
The only ways I can see to do it are:
loop over the array, calling attach() once for each entry and passing along the current counter index as sort_order.
first detach() all associations and then pass mediaIds array to attach() or sync(). A side benefit would be that it eliminates the need for a sort_order column at all.
I'm hoping there is an easier solution that requires fewer trips to the database. Or am I just overthinking it and, in reality, doing the loop myself is really no different than letting Laravel do it further down the line when it receives the array?
[SOLUTION] I got it working by reshaping the array as follows. It explodes the comma-delimited 'mediaIds' request param and loops over the resulting array, assigning each media id as the key in the $mediaIds array, setting the sort_order value equal to the key's position within the array.
$rawMediaIds = explode(',', request('mediaIds'));
foreach($rawMediaIds as $mediaId) {
$mediaIds[$mediaId] = ['sort_order' => array_search($mediaId, $rawMediaIds)];
}
And then sorted by sort_order when retrieving the Page's associated media:
public function media() {
return $this->belongsToMany(Media::class)->orderBy('sort_order', 'asc');
}
You can add data to the pivot table while attaching or syncing, like so:
$mediaIds = [
1 => ['sort_order' => 'order_for_1'],
3 => ['sort_order' => 'order_for_3']
];
//[STORE]
$page->media()->attach($mediaIds;
//[UPDATE]
$page->media()->sync($mediaIds);
I am using laravel
I want to change the value of a column according to a specific condition.
if a condition is satisfied in wherehas then change the value of specific column to 1 let's say.How could i do it.
if i can call a function in the model inside the wherehas function to change the value how could I do it ??
i can iterate the result set using a 2 for loops and change it, however I want to decrease the complexity by changing the value while retrieving the data
Course::with('stages','stages.levels')->whereHas('stages.levels', function($query)use ($levelsarray){
$query->wherenotIn('id', $levelsarray);
here I want to change a column value in table levels
})->first();
Here is a general way,
Assuming you have Three models, Course, Stage, Level
When you are retrieving data from Level model, add an accessor,
For more info click here.
Eg:
On Level.php model,
public function getColumnNameAttribute($value) // replace ColumnName with column name
{
//write application logic here.
return $value;
}
Using Laravel 5.3, I have a model with the following function
public function myData() {
return $this->hasMany(MyData::class);
}
and in my collection I have the following
$my_data = MyModel->myData()->get();
All good so far. If I return $my_data I get an eloquent collection with three items.
What I need now though is to create a duplicate of that collection but containing only three of the fields.
I have tried several different things, each of which return an error. The following is the closest I have got, but this returns an empty array - I assume because the fields are located one level deeper than the collection object.
$new_collection = $my_data->only(['field_1', 'field_2', 'field_3']);
What would be the correct way to create a new collection containing all three items, each with only the three selected fields?
Thanks for your help
You could use map:
$slimmed_down = $collection->map(function ($item, $key) {
return [
'field_1' => $item->field_1,
'field_2' => $item->field_2,
'field_3' => $item->field_3
];
});
This will return a new Collection with just the values you want. As far as I know there isn't any other method that does what you want, so iterating over every item and selecting the fields this way is one of the few solutions.
The advantage of using map instead of a standard foreach loop is that when you use map it returns a new instance of Collection.
Edit:
After some thoughts and research about this, the problem you'll have created is that the all the values in the Collection aren't instances of anything anymore. If you don't mind this effect, an even prettier and faster way would be to do this:
$slimmed_down = $collection->toArray()->only(['field_1', 'field_2', 'field_3']);
This basically has the same result.
Using Laravel 9, I just had the same issue :
$my_data->only(['field_1', 'field_2', 'field_3']);
returning an empty array.
I solved it with :
$my_data->map->only(['field_1', 'field_2', 'field_3']);