youxiangjie/application/api/model/Parameter.php

<?php
namespace app\api\model;
use think\Model;

class Parameter extends Model
{
    protected $name = 'parameter';
    protected $resultSetType = 'collection';
    public function commoditycolor () {
       return  $this->hasMany('commoditycolor','p_id','p_id');
    }
    public function commodity () {
       return  $this->belongsTo('commodity','c_id','c_id');
    }
}