I have two tables. codes and translations. 
codes table
id | name
---|------
1  | A99
translations table
id | code_id | language_code | copy
---|---------|---------------|------
1  |1        |en             | Heart Disease
2  |1        |fr             | Sning Nat
Code model
class Code
{
  function translation() // for default lanuage
  {
   return $this->hasOne(Translation::class, 'code_id')->where('language_code', 'en);
  }
}
Query
$codes = Codes::with(['translation' => function($query){
 $query->where('copy', 'like', '%hltad la loq%');
}]);
This should return nothing, but it returns all Codes without translation.
In other words I just want this query behind the scene.
select codes.*, translations.copy from codes
inner join translations ON codes.id = translations.code_id
where translations.language_code='en'
and translations.copy like '%hltad la loq%'
 
    