如何从关系 table、Laravel 中获取 ID

Question

我有 4 个 table：用户、公司注册、凭证详细信息、添加凭证。因此，Authenticate Users Id 将作为 user_id 在 companyRegister table 中提交，然后 companyRegister ID 将作为 company_id 在 Voucherdetails table 中提交，最后将提交 voucherDetails Id在 addVoucher table 中作为 voucher_ID。我是 eloquent 和 laravel 的新手，我不明白为什么我无法从 voucherdetails 获取 id 并在 addvoucher 中提交，但我可以从 companyregister 获取 id 并在 company_id 中提交到 voucherdetails .我正在使用相同的方法获取ID但不起作用，希望能在这里得到解决方案和解释，提前谢谢！！

我的用户模型

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

public function voucherdetails()
{
     return $this->hasMany('App\voucherdetails');
}

 public function addvoucher()
{
     return $this->hasMany('App\addvoucher');
}

public function roles()
{
    return $this->belongsToMany('App\role');
}

public function hasAnyRoles($roles)
{
    if($this->roles()->whereIn('name', $roles)->first()){
        return true;
    }
    return false;
}

  public function hasRole($role)
{
    if($this->roles()->where('name', $role)->first()){
        return true;
    }
    return false;
}

我公司注册型号

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

public function voucherdetails()
{
     return $this->hasMany('App\voucherdetails');
}

我的优惠券详情模型

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


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

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

我的 addvoucher 模型

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

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

我的voucherdetailsController

         public function store(Request $request){
    
    $voucherdetail = new voucherdetails();

    $voucherdetail->title = $request->input('title');
    $voucherdetail->description = $request->input('description');
    $voucherdetail->user_id = Auth::user()->id;

    $id = Auth::user()->id;
    $user      = User::find($id);
    $company   = $user->companyregisters;
    $companyId = $company->id;

    $voucherdetail->company_id = $companyId;

    $voucherdetail->save();
    
    return redirect()->to('addvoucher');
        
    }

我的 addvoucherController

        public function store(Request $request){

    $addvoucher = new addvoucher();

    $addvoucher->voucherTitle = $request->input('voucherTitle');
    $addvoucher->voucherCode = $request->input('voucherCode');
    $addvoucher->user_id = Auth::user()->id;

//Here(the voucherdetails id cant get to submit in voucher_id)

    $id = Auth::user()->id;
    $user      = User::find($id);
    $voucher   = $user->voucherdetails;
    $voucherID = $voucher->id;

    $addvoucher->voucher_id = $voucherID;

    $addvoucher->save();
    
    return redirect()->to('displayVouchers');

}

Answer 1

此代码有效，因为 companyregisters 是一个 hasOne 关系，文档说：

Once the relationship is defined, we may retrieve the related record using Eloquent's dynamic properties.

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

$company   = $user->companyregisters; // ie this returns the single related record 
$companyId = $company->id;            // and it has an `id` property, all good here

但是，此代码失败，因为 voucherdetails 是一个 hasMany 关系，文档说：

Once the relationship has been defined, we can access the "collection" of comments by accessing the comments property.

More info on collections

public function voucherdetails()
{
     return $this->hasMany('App\voucherdetails');
}


$voucher   = $user->voucherdetails; // ie this returns a "collection" of related records
$voucherID = $voucher->id;          // this "collection" does NOT have an id property, but each record IN the collection does.

总而言之，您的关系定义不正确（hasMany 与 hasOne），或者您需要遍历相关记录以从每个记录中获取 ID。

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