雄辩，数据透视表数据

Question

I got three tables routines, measurements and pools, their pivot table is measure_routine which also stores a pool_id which references a pool in the pools table. The setup looks like such:

routines:

id
value
date
time
emp_id (To reference which employee conducted the task)

measurements:

id
title

pools

id
name

and the pivot table, measure_routine:

routine_id
measure_id
pool_id

Thus far I have defined in my models:

Routine.php

class Routine extends Eloquent
{
        public function measurements
        {
            return $this->belongsToMany('Measurement', 'measure_routine', 'routine_id', 'measure_id', 'pool_id')->withPivot('pool_id');
        }
    }

Measurement.php

class Measurement extends Eloquent
{
    public function routines()
    {
        return $this->belongsToMany('Routine', 'measure_routine')->withPivot('pool_id');
    }
}

Pool.php

class Pool extends Eloquent

{
    public function measurement_routine()
    {
        return $this->hasMany('measure_routine', 'pool_id');
    }
}

What I was wondering is how I would go about extracting the pool_id (or possibly the pool name from the pool table) using eloquent?

Currently I've tried using $data = Routine::has('measurements')->get() in the controller, and then trying {{ $data->pivot->pool_id }} in the view, but that resulted in a trying to get property of non-object error.

Answer 1

You may try something like this (To get the first item from collection and pivot):

$data = Routine::has('measurements')->get();
$data->first()->measurements->first()->pivot->pool_id;

Because, $data is a collection of Routine returned by get() so the first item has another collection of measurements, so again to get the first measurements from the collection you may use first() again and then access the pivot->pool_id, so you may also use a loop in your view as well, something like this:

@foreach($data as $routine)
    {{ $routine->property }}
    @foreach($routine->measurements as $measurement)
        {{ $measurement->property }}
        {{ $measurement->pivot->property }}
    @endforeach

@endforeach