Laravel / Mongodb - Get data from multiple collection - php

Question

I am using this package for my Laravel Application. I can get single collection data using this query:
$product = DB::connection( 'mongodb' )->collection( 'products_1' )->paginate( 5 );
Now, I have multiple collection for e.g:
products_2, products_3, products_4 and so on...
I want to get data from all the collection at once.
Could you tell me is there any way I can get ?
Thank You.

Answer 1

First, create a Product model:
use Jenssegers\Mongodb\Eloquent\Model;
class Product extends Model
{
protected $collection = 'products_1';
}
Then try to use $unionWith aggregation in whereRaw function:
$products = Product::whereRaw(function($collection) {
return $collection->aggregate([
[
'$unionWith' => [
'coll' => 'products_2',
]
],
[
'$unionWith' => [
'coll' => 'products_3',
]
],
[
'$unionWith' => [
'coll' => 'products_4',
]
],
]);
})->paginate(5);
Ref:
https://www.mongodb.com/docs/manual/reference/operator/aggregation/unionWith/
https://github.com/jenssegers/laravel-mongodb/issues/2235
If not work, try raw with toQuery:
$products = Product::raw(function($collection) {
return $collection->aggregate([
[
'$unionWith' => [
'coll' => 'products_2',
]
],
[
'$unionWith' => [
'coll' => 'products_3',
]
],
[
'$unionWith' => [
'coll' => 'products_4',
]
],
]);
})->toQuery()->paginate(5);
Ref: https://github.com/jenssegers/laravel-mongodb/issues/1574

Answer 2

I feel the best way to go about this is to define the model for the collection having in mind that relational db uses tables while non-relational db like mongo uses collections, ill suggest you define your mongo collection in a model class.
Just like a normal model, the MongoDB model class will know which collection to use based on the model name. For Products, the collection Products will be used.
use Jenssegers\Mongodb\Eloquent\Model;
class Book extends Model
{
protected $collection = 'products';
}