Model 创建轴模型时发生拉威尔错误
我有以下模型和关系:Model 创建轴模型时发生拉威尔错误,model,laravel-5,pivot-table,Model,Laravel 5,Pivot Table,我有以下模型和关系: class Fence extends Model { public function fenceLines(){ return $this->hasMany('App\Models\FenceLine'); } public function newPivot(Model $parent, array $attributes, $table, $exists){ if ($parent instanceof
class Fence extends Model {
public function fenceLines(){
return $this->hasMany('App\Models\FenceLine');
}
public function newPivot(Model $parent, array $attributes, $table, $exists){
if ($parent instanceof FenceLine) {
return new FenceLine($parent, $attributes, $table, $exists);
}
return parent::newPivot($parent, $attributes, $table, $exists);
}
}
class FencePoint extends Model {
public function fenceLines(){
return $this->hasMany('App\Models\FenceLine');
}
public function newPivot(Model $parent, array $attributes, $table, $exists){
if ($parent instanceof FenceLine) {
return new FenceLine($parent, $attributes, $table, $exists);
}
return parent::newPivot($parent, $attributes, $table, $exists);
}
}
class FenceLine extends Pivot {
protected $table = 'fences_fence_points';
public function fence(){
return $this->belongsTo('App\Models\Fence');
}
public function fencePoint(){
return $this->belongsTo('App\Models\FencePoint');
}
}
调用$fence->fenceLines()
时,出现以下错误:
Argument 1 passed to App\Models\Fence::newPivot() must be an
instance of Illuminate\Database\Eloquent\Model, none given
我读过很多关于这个问题的博客,但我找不到任何解决方案。如果我没有弄错的话,它看起来像是一个简单的语法错误;当它们应该是反斜杠时,您使用的是普通斜杠。
hasMany($related,$foreignKey=null,$localKey=null)
希望您为相关模型提供一个命名空间路径,而不是目录(这样才能正确执行$instance=new$related
)
因此,当您尝试实例化一个新的hasMany对象时,您会失败,因为new App/Models/FenceLine
将返回null或false(当您尝试实例化一些不存在的对象时,不完全确定值是什么)。我最终找到了它
有两个问题
class Fence extends Model {
public function fencePoints(){
return $this->hasMany('App\Models\FencePoint');
}
...
}
public function newPivot(Model $parent, array $attributes, $table, $exists){
if ($parent instanceof FencePoint) {
return new FenceLine($parent, $attributes, $table, $exists);
}
在FencePoint模型中:
public function newPivot(Model $parent, array $attributes, $table, $exists){
if ($parent instanceof Fence) {
return new FenceLine($parent, $attributes, $table, $exists);
}
然后可以使用轴模型,例如:
$fence = Fence::find(1);
$fencePoint = $fence->fencePoints->first();
$fenceLine = $fencePoint->pivot;
这是一个问题。谢谢你找到那个。然而,这并没有解决问题。此后,我更新了问题中的代码。