Combine multiple queries (Laravel 5) - php

Question

I try to make a search engine for users. The search will be with multiple fields so as the user can be selecting whatever he want and get the result.
routes.php:
Route::get('search/{tag?}/{town?}/{education?}/{contract?}', 'DisplayJobs#getSearch');
DisplayJobs.php Controller
public function getSearch($tag = null, $town = null, $education = null, $contract = null)
{
//get already database values to send them to the form
$tags = \App\Tag::lists('name', 'id');
$contract = \App\Contract::lists('name', 'id');
$towns = \App\Town::lists('name', 'id');
$education = \App\Education::lists('name', 'id');
$tagQueryBuilder = Tag::query();
$townQueryBuilder = Town::query();
$educationQueryBuilder = Education::query();
$contractQueryBuilder = Contract::query();
if(Input::has('tag'))
{
$tagQueryBuilder->TagOfUser(Input::get('tag'));
}
if(Input::has('town'))
{
$townQueryBuilder->TownOfUser(Input::get('town'));
}
if(Input::has('education'))
{
$educationQueryBuilder->EducationOfUser(Input::get('education'));
}
if(Input::has('contact'))
{
$contractQueryBuilder->ContactOfUser(Input::get('contact'));
}
return view('main.search_jobs', compact('tags', 'towns', 'contract', 'education'));
}
If I try with each single query it works perfectly but I want to combined result data from all the queries or a way to query all the data at once.
In each model I have my query scope like this (Tag.php) Model:
public function jobs()
{
return $this->belongsToMany('App\Job');
}
public function scopeTagOfUser($query, $tag)
{
return $query->where('id', '=', $tag)->with('jobs');
}

Answer 1

After a lot of hours I found a solution. I will post it below so if anyone has the same problem can see one solution.
First I have delete all of the scope queries in the models and all of the work completed to the controller like bellow:
public function getSearch($tag = null, $town = null, $education = null, $contract = null)
{
//get already database values to send them to the form
$tags = \App\Tag::lists('name', 'id');
$towns = \App\Town::lists('name', 'id');
$contract = \App\Contract::lists('name', 'id');
$education = \App\Education::lists('name', 'id');
//get inputs from users
$getTagFromUser = Input::get('tag');
$getTownFromUser = Input::get('town');
$getContractFromUser = Input::get('contract');
$getEducationFromUser = Input::get('education');
$tagQuery = DB::table('jobs')
->join('job_tag', 'jobs.id', '=', 'job_tag.job_id')
->join('tags', 'job_tag.tag_id', '=', 'tags.id')
->where('tags.id', '=', $getTagFromUser);
$townQuery = DB::table('jobs')
->join('job_town', 'jobs.id', '=', 'job_town.job_id')
->join('towns', 'job_town.town_id', '=', 'towns.id')
->where('towns.id', '=', $getTownFromUser);
$contractQuery = DB::table('jobs')
->join('job_contract', 'jobs.id', '=', 'job_contract.job_id')
->join('contracts', 'job_contract.contract_id', '=', 'contracts.id')
->where('contracts.id', '=', $getContractFromUser);
$educationQuery = DB::table('jobs')
->join('job_education', 'jobs.id', '=', 'job_education.job_id')
->join('education', 'job_education.education_id', '=', 'education.id')
->where('education.id', '=', $getEducationFromUser);
$finalQuery = $tagQuery->union($townQuery)->union($contractQuery)->union($educationQuery)->get();
return view('main.search_jobs', compact('tags', 'towns', 'contract', 'education', 'finalQuery'));
}