Column not found. Laravel

Question

I'm trying to filter my results from two tables: trips and activities that are linked by table trips_activities. Activity: Trip:

Trip_Activity:

Their relations are defined as follow: In activity model:

public function trips()
    {
        return $this->belongsToMany('App\Trip',"trips_activities","activityid","tripsid");
    }

In trip model:

public function activities()
    {
        return $this->belongsToMany('App\Activity',"trips_activities","tripsid","activityid");
    }

When i try to run following query:

$trips = $trips->whereHas('activities', function($r) use($activities) {
            $r->whereIN('activityid', $activities)->get();
            });

It gives following output:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'trips.id' in 'where clause' (SQL: select * from `activities` inner join `trips_activities` on `activities`.`id` = `trips_activities`.`activityid` where `trips_activities`.`tripsid` = `trips`.`id` and `activityid` in (2))

Answer 1

Your Query

select * from `activities` 
inner join `trips_activities` on `activities`.`id` = `trips_activities`.`activityid`
where `trips_activities`.`tripsid` = `trips`.`id` and `activityid` in (2)

Here trips.id means look for trips table and id column. But I do not see any trips table. I believe it should be activities.tripsid

Answer 2

You use the get() function in wrong place. You need add ->get() after all your query:

$trips = $trips->whereHas('activities', function($r) use($activities) {
        $r->whereIN('activityid', $activities);
        })->get();