duxet/laravel-rethinkdb

<?php

namespace duxet\Rethinkdb\Eloquent\Relations;

class BelongsTo extends \Illuminate\Database\Eloquent\Relations\BelongsTo
{
    protected $otherKey = 'id';
    /**
     * Set the base constraints on the relation query.
     *
     * @return void
     */
    public function addConstraints()
    {
        if (static::$constraints) {
            // For belongs to relationships, which are essentially the inverse of has one
            // or has many relationships, we need to actually query on the primary key
            // of the related models matching on the foreign key that's on a parent.
            $this->query->where($this->otherKey, '=', $this->parent->{$this->foreignKey});
        }
    }

    /**
     * Set the constraints for an eager load of the relation.
     *
     * @param array $models
     *
     * @return void
     */
    public function addEagerConstraints(array $models)
    {
        // We'll grab the primary key name of the related models since it could be set to
        // a non-standard name and not "id". We will then construct the constraint for
        // our eagerly loading query so it returns the proper models from execution.
        $key = $this->otherKey;

        $this->query->whereIn($key, $this->getEagerModelKeys($models));
    }
}