I have an array of city codes
$cities=[9,12,14,2,3,4,5,6,8,10,11,13]
My posts table has a foreign key named city_id
I want sorting posts based on the values of this array
In this way: the first posts of the city 9 then the posts of the city 12 and then posts of city 14 and etc to be loaded
I tried using this method but this is wrong
$posts->orderByRaw('city_id in ? desc',$cities);
Can you help me find the best solution?
The only way i can i think of doing something like that(at least right now) is by doing something like so
$all_posts = [];
$cities=[9,12,14,2,3,4,5,6,8,10,11,13];
foreach ($cities as city) {
$city_posts = Post::whereRaw('city_id = ?', $city)->orderByRaw('created_at DESC');
array_push($all_posts, $city_posts);
}
dd($all_posts);
1st find all the posts relevant to cities and then sort w.r.t given order like
$cities = [9,12,14,2,3,4,5,6,8,10,11,13]; // order you'd like to see with posts
$posts = Post::whereIn('city_id', $cities)->sort(function($a, $b) uses ($cities) {
$pos_a = array_search($a->getAttributes()['city_id'], $cities);
$pos_b = array_search($b->getAttributes()['city_id'], $cities);
return $pos_a - $pos_b;
})->get();
// $posts contains the required order with city_ids
You can use raw query with "CASE something THEN index" this way you tell the query to see something as index so you can assign 0 to the first item in your array.
$sql .= "....";
foreach($cities as $index => $city) {
$sql .= "CASE {$city} THEN {$index}";
}
$sql .= "....";
Thanks to the friends solution,I used this method, and I think it's less complicated than the suggested methods of friends
$posts=$posts->orderByRaw('FIELD(city_id, '.$cities->implode( ', ').') asc')->orderBy('created_at','desc')->get();
Related
$projects = Project::find(collect(request()->get('projects'))->pluck('id')); // collect(...)->pluck('id') is [2, 1]
$projects->pluck('id'); // [1, 2]
I want the result to be in the original order. How do I achieve this?
Try $projects->order_by("updated_at")->pluck("id"); or "created_at" if that's the column you need them ordered by.
Referencing MySQL order by field in Eloquent and MySQL - SELECT ... WHERE id IN (..) - correct order You can pretty much get the result and have it order using the following:
$projects_ids = request()->get('projects'); //assuming this is an array
$projects = Project::orderByRaw("FIELD(id, ".implode(',', projects_ids).")")
->find(projects_ids)
->pluck('id'));
#Jonas raised my awareness to a potential sql injection vulnerability, so I suggest an alternative:
$projects_ids = request()->get('projects');
$items = collect($projects_ids);
$fields = $items->map(function ($ids){
return '?';
})->implode(',');
$projects = Project::orderbyRaw("FIELD (id, ".$fields.")", $items->prepend('id'))
->find($projects_ids);
The explanation to the above is this:
Create a comma separated placeholder '?', for the number of items in the array to serve as named binding (including the column 'id').
I solve this by querying the data one by one instead mass query.
$ids = collect(request()->get('projects'))->pluck('id');
foreach($ids as $id){
$projects[] = Project::find($id);
}
$projects = collect($projects);
$projects->pluck('id');
I have to do this manually because laravel collection maps all the element sorted by using ids.
I'm in a situation where I'm doing a MySQL query with Codeigniter and where I have a lot of fields value request which are ALL the same.
Example:
$this->db->query('SELECT * FROM abc WHERE user_id = ? AND msg_from = ? AND msg_to != ?', [$id, $id, $id]);
This has just 3 question marks but the query I'm working on is HUGE and has 19 question marks WHICH ARE ALL THE SAME variable.
So I was trying to figure out how to tell Codeigniter all question marks are pointing to the same variable without having to fill an array with 19 times the same variable.
I thought of a for-loop but I wanted to know if a shortcut exist.
you should be able to do this with Codeigniters Query Builder pretty easily
Something like that should work:
$this->db
->select('*')
->from('abc');
$arrFields = array('users_id', 'msg_from', 'msg_to');
foreach($arrFields AS $val)
{
$this->db->where($val, $id);
}
$query = $this->db->get();
I'm trying to merge multiple objects (like Receipts, Reports, etc) with Collection->merge().
This is the code I used:
$receipts = Receipt::all();
$reports = Report::all();
$collection = $receipts->merge($reports);
This is the result:
The above screenshot shows two elements, but the third element is missing because it has the same id (id: "1") as the first one. What I'm trying to achieve is to display all three of them as a collection.
EDIT:
I need the result to be objects (collection) because I also use the code on my view, where I check the class to determine what to display. Also, I use this function to sort the objects in the collection.
$collection->sort(function($a, $b)
{
$a = $a->created_at;
$b = $b->created_at;
if ($a === $b) {
return 0;
}
return ($a > $b) ? 1 : -1;
});
I know that this is an old question, but I will still provide the answer just in case someone comes here from the search like I did.
If you try to merge two different eloquent collections into one and some objects happen to have the same id, one will overwrite the other. I dunno why it does that and if that's a bug or a feature - more research needed. To fix this just use push() method instead or rethink your approach to the problem to avoid that.
Example of a problem:
$cars = Car::all();
$bikes = Bike::all();
$vehicles = $cars->merge($bikes);
// if there is a car and a bike with the same id, one will overwrite the other
A possible solution:
$collection = collect();
$cars = Car::all();
$bikes = Bike::all();
foreach ($cars as $car)
$collection->push($car);
foreach ($bikes as $bike)
$collection->push($bike);
Source: https://medium.com/#tadaspaplauskas/quick-tip-laravel-eloquent-collections-merge-gotcha-moment-e2a56fc95889
I know i'm bumping a 4 years old thread but i came across this and none of the answers were what i was looking for; so, like #Tadas, i'll leave my answer for people who will come across this. After Looking at the laravel 5.5 documentation thoroughly i found that concat was the go-to method.
So, in the OP's case the correct solution would be:
$receipts = Receipt::all();
$reports = Report::all();
$collection = $receipts->concat($reports);
This way every element in the Report collection will be appended to every element in the Receipts collection, event if some fields are identical.
Eventually you could shuffle it to get a more visual appealing result for e.g. a view:
$collection->shuffle();
Another way to go about it is to convert one of your collections to a base collection with toBase() method. You can find it in Illuminate\Support\Collection
Method definition:
/**
* Get a base Support collection instance from this collection.
*
* #return \Illuminate\Support\Collection
*/
public function toBase()
{
return new self($this);
}
Usage:
$receipts = Receipt::all();
$reports = Report::all();
$collection = $receipts->toBase()->merge($reports);
You could put all collections in an array and use this. Depends on what you want to do with the collection.
$list = array();
$list = array_merge($list, Receipt::all()->toArray());
$list = array_merge($list, Report::all()->toArray());
I have a query in laravel:
...
$query = $model::group_by($model->table().'.'.$model::$key);
$selects = array(DB::raw($model->table().'.'.$model::$key));
...
$rows = $query->distinct()->get($selects);
this works fine and gives me the fields keys' that I need but the problem is that I need to get all the columns and not just the Key.
using this:
$selects = array(DB::raw($model->table().'.'.$model::$key), DB::raw($model->table().'.*'));
is not an option, cuz it's not working with PostgreSQL, so i used $rows to get the rest of columns:
for ($i = 0; $i<count($rows); $i++)
{
$rows[$i] = $model::find($rows[$i]->key);
}
but as you see this is it's so inefficient, so what can i do to make it faster and more efficient?
you can find the whole code here: https://gist.github.com/neo13/5390091
ps. I whould use join but I don't know how?
Just don't pass anything in to get() and it will return all the columns. Also the key is presumably unique in the table so I don't exactly understand why you need to do the group by.
$models = $model::group_by( $model->table() . '.'. $model::$key )->get();
4 for on on my applications with Doctrine.
In there I'm using the following doctrine command to retrieve person object collection
//query
$people = $q->execute();
This return 20 objects. The primary key of the person object is a composite key with three attributes. Those are
id
department_id
name
I need to get person objects by searching in it as follows.
$id = 10;
$department_id = 1;
$name = "abc";
$people->get($id, $department_id, $name);
But this doesn't work and not give correct results. I tried with this and it gives null results which seems my collections primary key is not set.
$people->getKeyColumn();
I don't want to go through a foreach loop in collection and process it because when I deal with about 500 people, it slow down my application.
Can some one help me with this issue to get values from a doctrine collection.
Can you use something like this?
$people = Doctrine::getTable('Persons')
->createQuery()
->where('id = ? AND department_id = ? AND name = ?', array($id, $department_id, $name))
->execute();
It will get you a DoctrineCollection already filtered by the parameters provided.
'Persons' here is a Doctrine model name, not a table name from mySQL.
You can also use Doctrine's magic finders findBy*():
$people = Doctrine_Core::getTable('Persons')
->findByIdAndDepartmentIdAndName($id, $department_id, $name);