Join multiple tables used as Indexing - Laravel - sql

Question

I have three tables - Chairman, Designation, Members.
MY requirement is to map the member to chairman and assign member a role.
I was able to fetch the list of members under the chairman when I had chairman_id and designation_id in the members table.
Since the chairman change, most of the members stay intact. So I came up with an idea of indexing them
Table - membermap
id | chairman_id | designation_id | member_id
So the list is preserved how many chairmans come and go. I dont need to create new profile for new chairman rather than map to it.
I am now sure how do I do it,
So far I was able to pull the ID but I am not sure how do I join the tables
Tables
Chairman
id| name
Designation
id|designation
Members
id|members
Here is my controller
$mapmember = Statechairman::findOrFail($id)->statechairmembersmap;
dd($mapmember);
In this Iam getting the statechairmembersmap but it's fetching all the result and not limiting the match.
I also tried to join the query using the DB
$mapmember = DB::table('statechairmen')
->join('state_chairman_members_maps', 'state_chairman_members_maps.chairman_id','statechairmen.id')
->join('statemembers','statemembers.id','state_chairman_members_maps.members_id')
->select('state_chairman_members_maps.*')->get();
but this result show me the Table - membermap but not the other results.
My Models:
Chairman :
public function statechairmembersmap(){
return $this->hasMany('App\StateChairmanMembersMap','chairman_id','id');
}
public function statemembers(){
return $this->hasMany('App\Statemembers','chairman_id', 'id');
}
public function statedesignation(){
return $this->hasMany('App\Statedesignation','id','designation_id');
}
membermap:
protected $table = 'state_chairman_members_maps';
protected $dates = ['deleted_at'];
public function statechairman(){
return $this->belongsTo('App\Statechairman','id');
}
public function statedesignations(){
return $this->belongsTo('App\Statedesignation','designation_id','id');
}
public function statemembers(){
return $this->belongsTo('App\Statemembers','members_id','id');
}
Please assist me where I doing wrong.

Answer 1

Thanks a lot for checking the question out.
Finally after a lot of strugle, I was able to find it by myself.
$mapmembers = DB::table('state_chairman_members_maps')
->join('statechairmen','statechairmen.id','=','state_chairman_members_maps.chairman_id')
->join('statemembers','statemembers.id','=','state_chairman_members_maps.members_id')
->join('statedesignations','statedesignations.id','=','state_chairman_members_maps.designation_id')
->where('chairman_id','=',$id)
->get();
Here is what I came up with.
Here I have joined 3 tables and mapped the id comming from the chairman to filter the result. I getting the results.