I have Book and Store models which have belongsToMany relationship.
In Book.php
public function stores(){
return $this->belongsToMany('App\Store')->withPivot('qty');
}
In Store.php
public function books(){
return $this->belongsToMany('App\Book')->withPivot('qty');
}
Now I just want to know the total number of books in store A and B together. How can I do it with eloquent ORM? I can get all books belonging to store A and B using whereHas but cannot go further to aggregate the qty field in the pivot table.
So you want the total qty of books by combination of store id and book id
The way you've described your DB structure, it looks like your pivot table has exactly these columns: book_id, store_id and qty
So all you really need to do is:
DB::table('book_stores')->get()
Related
I have such entities as:
Company
Person
Company hasMany Persons. So in the persons table there is company_id column.
I return company list, which I pass to CompanyResource. There I return has_persons => $this->persons()->exists() value.
Then I checked the result of DB::getQueryLog() and I found out that there is only one SQL query, which does not have count or anything like that.
In order to count how many persons a company has, Laravel should make one query per company, shouldn't it? Like select count (*) from persons where company_id = 5 for example
try this
$this->persons->count()
I have 4 tables.
User table:
id col1 col2
CoursesAssigned table:
id user_id course_id approved
CourseInfo table:
id parent_id
CourseParents table:
id start_date end_date
I think the table names and its column names are self explanatory.
I have 2 kinds of users - i) assigned ii) unassigned. I show them in 2 different pages.
While showing the assigned students I need those students from users table for each of whom there is at least one row in CoursesAssigned table where user_id is his own user id and the approved field is 1 and the course_id in that row has its own parent_id (from CourseInfo) with end_date (from CourseParents) greater than or equal to today.
For showing unassigned students, I need those students from users table, for each of whom -
either
there is NO row in CoursesAssigned table where the user_id is his own user id and the approved column has a value 1. That is for an unassigned user, there may exist a row with his own user id but the approved field contains 0.
or
there may be rows in CoursesAssigned table with the user_id being his own user id and the approved field having a value 1 but the parent_id obtained from CourseInfo has from CourseParents an end_date which is less than today's date.
I can write a query for assigned students like:
$date=date('Y-m-d');
$records = User::join('CoursesAssigned','users.id','=','CoursesAssigned.user_id')
->join('CourseInfo','CourseInfo.id','=','CoursesAssigned.course_id')
->join('CourseParents','CourseParents.id','=',
'CourseInfo.parent_id')
->where('CoursesAssigned.approved','=',1)
->where('CourseParents.end_date','>=',$date)
->select('users.id','users.col1','users.col2')
->orderBy('users.id','desc');
But that should not produce the correct result as that does not check CoursesAssigned table for at least 1 row that meets all mentioned criteria. Q1) Or should it ?
Q2) What is about the query that fetches only the unassigned students ?
EDIT : The answer can be in ORM, query builder or even raw MySql for Laravel format.
EDIT2 : Let me clarify the scenario here :
I need to fetch both assigned and unassigned users separately.
To obtain assigned users I have 1 rule: How can I get those users who have at least 1 approved course in CoursesAssigned table and the parent (obtained from CourseInfo table )of that course has the end_date (in CourseParents table) greater than or equal to today.
To obtain unassigned students I have 2 rules :
Rule 1: Get those tudents who do not have any approved course (i.e. all courses have approved =0). They are unassigned students
Rule 2: Get those students who have approved courses but none of the approved courses meet the criteria of those for assigned students . That means there is no approved course there that has a parent whose end_date is greater than or equal to today.They are also unassigned students.
I'm still not completely sure about your table relationships but from my guess, I came up with the following solution, first create the relationships using Eloquent models:
User Model (for usres table):
namespace App;
use App\Course;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable
{
use Notifiable;
public function courses()
{
return $this->hasMany(Course::class);
}
}
Course Model (for CoursesAssigned table):
namespace App;
use App\CourseInfo;
use Illuminate\Database\Eloquent\Model;
class Course extends Model
{
protected $table = 'CoursesAssigned';
public function courseInfo()
{
return $this->belongsTo(CourseInfo::class);
}
}
CourseInfo Model (for CourseInfo table):
namespace App;
use App\CourseParent;
use Illuminate\Database\Eloquent\Model;
class CourseInfo extends Model
{
protected $table = 'CourseInfo';
public function courseParent()
{
return $this->belongsTo(CourseParent::class, 'parent_id');
}
}
CourseParent Model (for CourseParents table):
namespace App;
use Illuminate\Database\Eloquent\Model;
class CourseParent extends Model
{
protected $table = 'CourseParents';
}
Get the assigned users:
$assignedUsers = User::whereHas('courses', function($query) {
$query->where('approved', 1)
->with(['courses.courseInfo.courseParent' => function($query) {
$query->where('end_date', >= \Carbon\Carbon::now());
}]);
})->get(); // paginate(...) for paginated result.
This should work if my assumption is correct. Try this for assignedUsers first then let me know and then I'll look into it for the other requirements. Also make sure that you do understand about Eloquent relationships between models and implement everything correctly (with correct namespace).
Note: This answer is incomplete and need further info because the answer is a result of direct conversation with OP over phone (OP called me because I was reachable) so some changes will be made overtime if needed and will be continued step by step until I can come up with a solution or leave it.
I have two tables :
users table
{id, name}
payments table
{id, user_id, payment}
Here I want to join two tables and want to use SUM(payment) function group by id.
please give me a solution.
You can do join like this way:
$payments = DB::table('users')->join('payments','users.id','=','payments.user_id')->groupBy('users.id')->sum('payment');
//use DB to in you controller
You can use a queryBuilder for make de custom query.
I have the following prices-table:
shop_id (int)
product_id (int)
price (float)
created (DateTime)
Every hour a cronjob checks the shops and inserts new entries (current prices) into these price-table.
Now I want to display the newest price for a product. I have to GROUP BY the shop_id because I only want one price per shop but I only want the newest entry (created).
Can I solve this with Eloquent Query-Builder or do I have to use raw SQL? Is it possible to pass the result of a raw SQL-query into a model if the columns are the same?
You can try it as:
Price::select('*', DB::raw('MAX(created_at) as max_created_at'))
->groupBy('shop_id')
->get()
Assuming model name is Price
Eloquent (purist) approach:
Price::orderBy('created', 'desc')->groupBy('shop_id')
->get('shop_id', 'price');
References:
https://laravel.com/api/5.3/Illuminate/Database/Query/Builder.html#method_orderBy
https://laravel.com/api/5.3/Illuminate/Database/Query/Builder.html#method_groupBy
https://laravel.com/api/5.3/Illuminate/Database/Query/Builder.html#method_get
*untested though
Q: Is it possible to pass the result of a raw SQL-query into a model if the columns are the same?
A: you could pass it to Model's contructor - but it might need model's field to be fillable - or hydrate a model. Alternatively, just access it like an keyed-array, ie. $something[0]['price'] <-- assuming an array of prices with price column.
I solved the problem without QueryBuilder. Instead I use a raw SQL-statement and generating the models with the hydrateRaw()-function of the Model-class.
$prices = Price::hydrateRaw( 'SELECT p.*
FROM prices p
INNER JOIN (
SELECT shop_id, max(created_at) AS max_ca
FROM prices p1
GROUP BY shop_id
) m ON p.shop_id = m.shop_id AND p.created_at = m.max_ca');
I'm having some trouble with my pivot table. I've recognized too late, that it is possible, that some pivot rows doesn't have unique values in my project, means I've to add an auto_increment ID field to my pivot table.
This is my structure:
Order.php
public function items()
{
return $this->belongsToMany('Item', 'orders_items', 'order_id', 'item_id')->withPivot(['single_price', 'hours', 'prov', 'nanny_id', 'vat', 'vat_perc', 'invoice_id','id']);
}
orders_items
id, order_id, item_id, nanny_id, hours
I've conntected Orders and Items through a pivot table ('orders_items)'. It is possible, that one order has 2 or more same items in the pivot table. So I've to add an unique ID to identify and update them.
Now I try to update a pivot row. Problem is, if I have 2 or more items, he updates them all, not only one. This is my update command:
$order = Order::find($orderId);
$items = $order->items()->whereNull('nanny_id');
$free_item = $items->first();
$free_item->pivot->nanny_id = 123;
$free_item->pivot->save();
With this command, he updates all pivot rows from the order. I know the problem: Laravel uses here the wrong identifiers (it uses order_id and item_id as defined in my belongsToMany relationship - and they aren't unique). For example, Laravel tries to execute this code on save():
UPDATE orders_items SET [...] WHERE order_id = 123 AND item_id = 2;
I want, that Laravel changes the query to this one:
UPDATE orders_items SET [...] WHERE order_id = 123 AND item_id = 2 AND id = 45;
// Edit
Okay, this solution works:
$free_item->pivot->where('id',$free_item->pivot->id)->update('nanny_id',123);
But is there an easier way, f.e. adding a custom pivot model that adds the id automatically to save() and update() methods?