How to implement a combined cross and inner joins in Laravel? - php

Question

I have defined 3 tables in Laravel as follow:
Schema::create('locales', function (Blueprint $table) {
$table->string('id', 2);
$table->string('name', 5000);
$table->timestamps();
$table->primary('id');
});
Schema::create('i18n_keys', function (Blueprint $table) {
$table->string('id', 255);
$table->timestamps();
$table->primary('id');
});
Schema::create('i18ns', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('key', 255);
$table->string('locale', 2);
$table->string('translation', 5000)->nullable();
$table->timestamps();
$table->foreign('key')->references('id')->on('i18n_keys')->onDelete('cascade')->onUpdate('cascade');
$table->foreign('locale')->references('id')->on('locales')->onDelete('cascade')->onUpdate('cascade');
$table->unique(array('key', 'locale'));
});
Now the question is how can I implement the following SELECT statement in Laravel programmatically. I mean without running the SQL statement directly.
SELECT `il`.`key`, `il`.`locale`, `in`.`translation` FROM
(SELECT `ik`.`id` AS `key`, `lo`.`id` AS `locale` FROM `i18n_keys` as `ik` CROSS JOIN `locales` as `lo`) AS `il`
left join `i18ns` as `in`
ON `in`.`key` = `il`.`key`
and `in`.`locale` = `il`.`locale`;
The aim is to extract the keys that they don't have a translation yet. But I like to do this with query builder or eloquent or something similar rather than pass the query directly. Is there any way?

Answer 1

You can try this code:
use App\Models\I18nKey;
$ik = I18nKey::crossJoin('locales as lo')
->select('i18n_keys.id AS key', 'lo.id AS locale');
$res = \DB::table(\DB::raw("({$ik->toSql()}) AS il"))
->mergeBindings($ik->getQuery())
->leftjoin('i18ns as in',function($join){
$join->on('in.key', '=', 'il.key')
->whereColumn('in.locale', 'il.locale');
})->select('il.key','il.locale','in.translation')->get();