为什么这个Laravel雄辩的查询会返回更多对象？

如何解决为什么这个Laravel雄辩的查询会返回更多对象？

我试图雄辩地找回一个与Laravel中的其他模型有关系的模型，但是我的查询不起作用。我想做的只是 显示带有相关组，单元和相关组件的dataLog并将其作为对象返回。参数$ componentId是唯一应该返回的组件，但它会返回其他 组件ID，组和单位。有没有办法只显示具有给定参数componentId的组件，而跳过其余不相关的组件？

<?   

   public function getLogData( $componentId,$limit ) {

        $dataLogs = Log::whereHas( 'groups',function( $group ) use (&$componentId) {
            $group->whereHas( "units",function( $unit ) use (&$componentId) {
                $unit->whereHas( "components",function( $component ) use (&$componentId) {
                    $component->where( "Component",$componentId );
                } );
            } );
        } )->take( $limit )->get();


        return response( )->json( $dataLogs );


    }
    
?>

回复是

[
{
    "Oid": 10409376,"Active": false,"Speed": "0","Weight": "0","Amount": "0","Code": "","Control": false,"Type": 1,"Event": 1,"Name": "TestName","Number": "","Mode": 0,"Recipe": "","DateTime": "2020-03-02 11:09:37.177","Check": 288,"groups": [
    {
        "Oid": 11162074,"Amount": "3.387","Cap": "0","ActTachoVoltage": "0","Act": "0","Weight": "497717","Codes": "","Name": "Group1","units": [
            {
            "Oid": 15934577,"Counter": 0,"components": [
                    {
                    "oId": 18168546,"component": 1102,"Entry": 15934577
                    }
                ]
            },{
            "Oid": 15934578,"component": 1101,}
]

给定查询所需的响应

[
{
    "Oid": 10409376,"components": [
            {
            "Oid": 15934578,}
]

如果给定的参数id是1101。有人知道我在做什么错吗？

模型和关系飞船

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class log extends Model
{

    // Define variables
    protected $primaryKey = 'Oid';
    protected $table = 'log';
    protected $connection = 'testdb';
    protected $appends = [ 'groups' ];

    // Functions
    public function getGroupsAttribute( )
    {
        if( $this->groups() )
            return $this->groups()->get();

        return [];
    }

    // Define model relationship logEntry = FK from log to group model 
    public function groups(){
        return $this->hasMany(groupLog::class,'logEntry');
    }

}


?>


<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class groupLog extends Model
{

    // Define variables
    protected $primaryKey = 'Oid';
    protected $table = 'groupLog';
    protected $connection = 'testdb';

    // Functions
    public function getUnitsAttribute( )
    {
        if( $this->units() )
            return $this->units()->get();

        return [];
    }

    // Define database relationships
    public function log(){
        return $this->belongsTo(log::class);
    }

    // Define model relationship groupEntry = FK from log to group model 
    public function units(){
        return $this->hasMany(unitLog::class,'groupEntry');
    }


}

?>


<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class unitLog extends Model
{

    // Define variables
    protected $primaryKey = 'Oid';
    protected $table = 'unitLog';
    protected $connection = 'testdb';
    protected $appends = [ 'components' ];

    // Functions
    public function getComponentsAttribute( )
    {
        if( $this->components() )
            return $this->components()->get();

        return [];
    }

    // Database relationships with models
    public function group(){
        return $this->belongsTo(groupLog::class);
    }

    public function components(){
        return $this->hasMany(componentLog::class,'unitEntry');
    }

}

?>


<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class componentLog extends Model
{
    // Define variables
    protected $primaryKey = 'Oid';
    protected $table = 'componentLog';
    protected $connection = 'testdb';

    // Define model database relationships
    public function units(){
        return $this->belongsTo(unitLog::class);
    }

}

?>

像这样尝试答案的方法

        $machineLogs = MachineLog::whereHas( 'groups',function($group) use ($componentId) {
            $group->whereHas( "units",function( $unit ) use ($componentId) {
                $unit->whereHas( "components",function( $component ) use ($componentId) {
                    $component->where("component",$componentId);
                } );
            } );
        } );

        $filterComponents = $machineLogs->with(['groups.units.components' => function ($query) use ($componentId) {
            $query->where('component',$componentId);
        }])->take($limit)->get();

        return response( )->json( $filterComponents );

    

解决方法

您正在查询具有给定单位的Log，并且无论它们具有什么ID，它将始终返回所有单位。您正在寻找的是使用with()来过滤关系。我仍然会使用您的完整查询，以获取正确的注销信息。

Log::yourQueries() // insert your existing queries here.
    ->with('groups.units.components' => function ($query) use ($componentId) {
        $query->where('component',$componentId);
    });

这将预加载组件并通过给定查询对其进行过滤，这将返回您的预期结果。