In my project, the user can filter the data according to 3 criteria (declared, in progress, finished).
I pass string, in the url parameters [-1,0,1], in order to obtain the active filters. the statuses are defined according to several data coming from different columns of the database, in other words the information is not stored raw in the database.
How can I retrieve filtered data using Query Builder?
$ret = array_filter(explode(',',', $args), 'is_numeric');
$declared = in_array(1, $ret);
$progress = in_array(-1, $ret);
finished = in_array(0, $ret);
if ($declared == false && $progress == false && $finished == false) {
// do the treatment for this case....
}
If I have to deal with all the cases like that, I don't think it's very optimized.
Do you have an idea?
If I understand correctly you have a url like this /your-link?status=n, where n is an int from -1 to 1.
Now, in your controller you can do something like this:
public function yourFunction(Request $request)
{
if (in_array($request['status'], [-1, 0, 1])) {
$data = DB::table('your-table')->where('status', $request['status'])->get();
}
}
I'd recommend you to take a look at pipelines and try to use them with Eloquent or Query builder.
Check out this tutorial and see for yourself how you can implement a solution.
Related
I have this table in my database.
ยป roles, and have content of 0,0,0,0,0,0
In this table i store user permissions. Example if he is an administrator it can be 0,0,0,0,0,1 or if he is an moderator and an administrator in the same time it can be 0,0,0,1,0,1.
But i don't know how i can show them in a query separated.
Example for administrator query only last parameter from that list 0,0,0,0,0,0.
So for it i have to do a explode in the query but i don't know how to do this.
I tried something like that to see if i can get the tables and explode it before query execute.
$query = User::where(
function($results) {
dd($results);
foreach($results as $result) {
print($result);
}
})->first();
Someone have an idea how i can do this?
if you have a fixed pattern you can "explode" it easily.
for example:
$result = "0,0,0,0,0,1"; // your data in for is string so:
$permission = explode(",",$result); // convert to an array.
// outpult is:
print ($permission);
[0 , 0 , 0 , 0 , 0 , 1 ];
print ($permission[5]);
// output is:
1
now you can access each cell of the array.
but It's not a clear way to make permission and role.
I suggest you use the different tables with different relationships.
I think this is not convenient way of implementing roles and permissions. If you are using Laravel then there is already a way to implement permissions in the form of gates and policies.
or you can implement it through a package like
Spatie Package
This might help it will return permissions ending with 1
User::where(function ($builder){
$builder->where('permission', 'regex','%1');
});
as a simple and appropriate solution,
you can also write your, where condition as below
->whereRaw("SUBSTRING_INDEX(SUBSTRING_INDEX(permission_column_name, ',', 6), ',', -1) = 1")
as you can see in the above code,
With SUBSTRING_INDEX(permission_column_name, ',', 6) function we will be able to extract everything up to the sixth value in your column separated by a comma.
Because SUBSTRING_INDEX() function also allows us to use negative values to extract fields counting from the right, we are using this ability to extract the rightmost field containing the last value of string with -1.
using the same above method you can also find any value available at any position as required in the given comma-separated string in a column.
Assuming that each user has a role, you can add some methods to the User model to handle permissions.
Class User extends Authenticatable {
private function getPermissions(): array {
return explode(',', $this->role)
}
public function isAdministrator(): bool {
$permissions = $this->getPermissions();
return $permissions[5] == 1;
}
public function isModerator(): bool {
$permissions = $this->getPermissions();
return $permissions[3] == 1;
}
}
Now you can use it in your code. Like this:
$user = auth()->user() // Or User::find($id) ...
if ($user->isAdministrator() || $user->isModerator()) {
// Do something
}
It's possible to make one query to get total, sold & unsold in laravel eloquent?
$total_apple = Item::whereName('Apple')->count();
$sold_apple = Item::whereName('Apple')->whereStatus(2)->count();
$unsold_apple = Item::whereName('Apple')->whereStatus(1)->count();
Yes you can totally do that. You can use filter method on collection object returned by your Eloquent query.
$apples = Item::whereName('Apple')->get();
$soldApples = $apples->filter(function ($apple){
return $apple->status == 2;
});
$unsoldApples = $apples->filter(function ($apple){
return $apple->status == 1;
});
$soldApples and $unsoldApples contains the object of the items. You can then just use count($soldApples) and count($unsoldApples) to get their count.
filter method is against the collection object so there is no sql overhead.
There is no need run multiple queries or even fetch the entire results and use collection methods to loop through. Just use raw queries.
$apples = Item::whereName('Apple')
->selectRaw('COUNT(*) as total_apples,
SUM(status=2) as sold_apples,
SUM(status=1) as unsold_apples')
->first();
echo $apples->total_apples; // Outputs total apples
echo $apples->unsold_apples; // Outputs the unsold apples
echo $apples->sold_apples; // Outputs the sold apples
Since you are only doing simple counts though, you can use the query builder as well.
I would get all the items in one collection, then run the where statement on that collection. This should trigger a single Query.
$apples = Item::whereName('Apple')->get(); // This goes against SQL
$total_apple = $apples->count(); //This runs on the Collection object not SQL
$sold_apple = $apples->whereStatus(2)->count();
$unsold_apple = $apples->whereStatus(1)->count();
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());
Is there any smart way of reusing current query. I want to use same query EXCEPT from one join. See example below:
$this->db->distinct();
$this->db->select('outfit_main.*');
$this->db->join('outfit_products', 'outfit_main.id = outfit_products.outfit_id');
$this->db->join('product', 'outfit_products.product_id = product.id');
$this->db->join('favorite', 'favorite.product_id = outfit_products.product_id');
$check = $this->db->get('outfit_main')->result('OutfitModel');
if ($check === false) {
//How to - use above query
//EXCEPT from
//$this->db->join('favorite', 'favorite.product_id = outfit_products.product_id');
$check = $this->db->get('outfit_main')->result('OutfitModel');
}
With smart way I mean that I wouldn't have to reset whole query and create a whole new query.
I'm using codeigniter and the pagination class. This is such a basic question, but I need to make sure I'm not missing something. In order to get the config items necessary to paginate results getting them from a MySQL database it's basically necessary to run the query twice is that right?
In other words, you have to run the query to determine the total number of records before you can paginate. So I'm doing it like:
Do this query to get number of results
$this->db->where('something', $something);
$query = $this->db->get('the_table_name');
$num_rows = $query->num_rows();
Then I'll have to do it again to get the results with the limit and offset. Something like:
$this->db->where('something', $something);
$this->db->limit($limit, $offset);
$query = $this->db->get('the_table_name');
if($query->num_rows()){
foreach($query->result_array() as $row){
## get the results here
}
}
I just wonder if I'm actually doing this right in that the query always needs to be run twice? The queries I'm using are much more complex than what is shown above.
Unfortunately, in order to paginate you must know how many elements you are breaking up into pages.
You could always cache the result for the total number of elements if it is too computationally expensive.
Yeah, you have to run two queries, but $this->db->count_all('table_name'); is one & line much cleaner.
Pagination requires reading a record set twice:
Once to read the whole set so that it can count the total number records
Then to read a window of records to display
Here's an example I used for a project. The 'banner' table has a list of banners, which I want to show on a paginated screen:
Using a public class property to store the total records (public $total_records)
Using a private function to build the query (that is common for both activities). The parameter ($isCount) we pass to this function reduces the amount of data the query generate, because for the row count we only need one field but when we read the data window we need all required fields.
The get_list() function first calls the database to find the total and stores it in $total_records and then reads a data window to return to the caller.
Remember we cannot access $total_records without first calling the get_list() method !
class Banner_model extends CI_Model {
public $total_records; //holds total records for get_list()
public function get_list($count = 10, $start = 0) {
$this->build_query();
$query = $this->db->get();
$result = $query->result();
$this->total_records = count($result); //store the count
$this->build_query();
$this->db->limit($count, $start);
$query = $this->db->get();
$result = $query->result();
return $result;
}
private function build_query($isCount = FALSE) {
$this->db->select('*, b.id as banner_id, b.status as banner_status');
if ($isCount) {
$this->db->select('b.id');
}
$this->db->from('banner b');
$this->db->join('company c', 'c.id = b.company_id');
$this->db->order_by("b.id", "desc"); //latest ones first
}
And now from the controller we call:
$data['banner_list'] = $this->banner_model->get_list();
$config['total_rows'] = $this->banner_model->total_records;
Things get complicated when you start using JOINs, like in my example where you want to show banners from a particular company! You may read my blog post on this issue further:
http://www.azmeer.info/pagination-hitting-the-database-twise/