Laravel 5.2外键约束失败

Question

当我尝试保存新属性时出现以下错误：

SQLSTATE [23000]：完整性约束违规：1452无法添加或更新子行：外键约束失败（STORMPATH_CLIENT_APIKEY_SECRET。lightning，CONSTRAINT residentials FOREIGN KEY（{{ 1}}）参考residentials_residential_type_id_foreign（residential_type_id））（SQL：插入residential_types（id，residentials，furnished，{{1 }}，rooms，rent）值（1,1,100,17,2016-07-06 23：32：59,2016-07-06 23:32:59））

我不明白为什么。

Db架构

物业模型：

property_id

地址模型

updated_at

住宅模型：

created_at

residential_type模型

   protected $table = 'properties';
/**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
    'user_id', 'is_for_sale','available','title', 'description','price'
];

public function user()
{
    return $this->belongsTo('App\User');
}


public function Residential()
{
    return $this->hasOne('App\Residential');
}

/**
 * The Addresses that belong to the properties.
 */
public function addresses()
{
    return $this->belongsToMany('App\Address');
}

我的控制器功能，我尝试保存属性以及相关住宅表中的字段，但我得到上面的错误。物业和地址保存正确，只是在住宅方面失败。

 /**
 * The attributes that are mass assignable.
 *
 * @var array
 */
protected $fillable = [
    'building_name', 'street_number', 'street_name', 'town', 'county', 'postcode','is_deleted'
];



/**
 * The Users that belong to the Address.
 */
public function user()
{
    return $this->belongsToMany('App\User');
}

/**
 * The Users that belong to the Address.
 */
public function organisation()
{
    return $this->belongsToMany('App\Organisation');
}

/**
 * The Users that belong to the Address.
 */
public function Property()
{
    return $this->belongsToMany('App\Properties');
}