I have cases, cases_judges, judges and witness tables. A case can have many judges and witness I want to be able to select all the judges and witness associated to a case I don't know how to create a relationship between case and judges because their is no direct link between judges and case. Cases_judges is the only intermediary between case and judge. I also tried using Hasmanythrough relationship but without success

Cases model

    public function case_judges(){
      return $this->hasMany(Cases_judges::class,'case_id','id');
    }
    public function witness(){
      return $this->hasMany(Witness::class,'case_id','id');
    }
   public function judges(){
      return $this->hasManyThrough(Judges::class, Case_judge::class,'judge_id','id');
   }

Judges model

public function judges(){
  return $this->hasMany(Case_judge::class,'case_id','id');
}

Cases_judge model

public function case(){
    return $this->belongsTo(Cases::class);
}

Cases Controller My case controller is something like this public function index() {

     return Cases::with('case_judge','witness')->get();
   
}

This fiddle (

The simplified diagram highlights the connection between your Case and Judge models via an intermediate CaseJudge model. Indeed, a Case really can have multiple Judges. However, we must not miss out the fact that a Judge can handle multiple Cases.

From this, we can conclude that Case and Judge models have a many-to-many relationship.

To establish a many-to-many relationship between models in Laravel, you must use belongsToMany relationship method, as opposed to hasManyThrough which only applies to one-to-many relationship.

class Cases extends Model {
  ...

  public function judges() {
    return $this->belongsToMany(Judges::class, 'case_judges', 'case_id', 'judge_id');
  }
}

Here, belongsToMany has four arguments:

1. Model that has the many-to-many relationship with our Cases model.
2. Intermediate table connecting tables cases and judges.
3. Foregin key on intermediate table that connects to table cases.
4. Foregin key on intermediate table that connects to table judges.

When all is set and done, running:

return Cases::with(['judges', 'witness'])->get();

will now return what you want — a collection of cases, along with witnesses and judges associated to their respective cases.

_{As a side note: you might want to follow Laravel's conventions on naming things, to avoid running into weird default Eloquent behaviors as consequence, and enjoy any conveniences it brings when you conform to these conventions.}

CodePudding user response：

I think cases and judges are 'Many to Many' relationship with intermediate table cases_judges.

You can follow this document to setup this : https://laravel.com/docs/9.x/eloquent-relationships#many-to-many