如何使用laravel雄辩地联接表？

debugcn 发表于 Dev

塔比斯

码：

function viewPDF()
{
$reports = Report::with([
        'quarters' => function($query) {
            // filters on quarters table
            return $query->where('column', 'value');
        },
        'presidents' => function($query) {
            // filters on presidents table
            return $query->where('column', 'value');
        }
    ])
    ->filter()  // only for reports table
    ->latest()
    ->get();

$pdf = PDF::loadView('reports.test1', ['reports' => $reports]);
return $pdf->stream('reports.pdf');
}

我想用口才来做。拜托，我该怎么办？

1桌 quarters

Schema::create('quarters', function (Blueprint $table) {
    $table->increments('id');
    $table->string('title');
    $table->timestamps();
});
Schema::create('quarter_report', function (Blueprint $table) {
    $table->integer('quarter_id')->unsigned();
    $table->integer('report_id')->unsigned();
    $table->primary(['quarter_id' , 'report_id']);
});

2桌 presidents

Schema::create('presidents', function (Blueprint $table) {
        $table->Increments('id');
        $table->string('P_name');
        $table->timestamps();
    });
 Schema::create('president_report', function (Blueprint $table) {
        $table->integer('president_id')->unsigned();
        $table->integer('report_id')->unsigned();
        $table->primary(['president_id','report_id']);
    });

3桌 reports

Schema::create('reports', function (Blueprint $table) {
        $table->Increments('id');
        $table->integer('user_id')->unsigned();
        $table->string('target_value');
        $table->text('major_activity');
        $table->string('indicator');
        $table->string('responsibility');
        $table->string('progress_activity');
        $table->string('documents')->nullable();
        $table->string('percentage_activity')->nullable();
        $table->text('problem')->nullable();
        $table->text('solution')->nullable();
        $table->text('description')->nullable();
        $table->string('image')->default('default.png');
        $table->tinyInteger('status')->default('0');
        $table->tinyInteger('active')->default('0');
        $table->timestamps();
    });

报告模型

class Report extends Model
{

public function quarters() {
    return $this->belongsToMany('App\Quarter', 'quarter_report', 'report_id', 'quarter_id');
}

public function presidents() {
    return $this->belongsToMany('App\President', 'president_report', 'report_id', 'president_id');
}

public function scopeFilter($query){
    $president = request('president');
    if ( isset($president)&& trim($president) != '' && $president != 'all'){
        $query->whereHas('presidents' , function ($query )use ($president){
            $query->whereId($president);
        });
    }
    $quarter = request('quarter');
    if ( isset($quarter)&& trim($quarter) != '' && $quarter != 'all'){
        $query->whereHas('quarters' , function ($query )use ($quarter){
            $query->whereId($quarter);
        });
    }


  }

总统模型

class President extends Model
{

public function reports() {
    return $this->belongsToMany('App\Report', 'president_report', 'president_id', 'report_id');
}
}

四分之一模型

class Quarter extends Model
{
public function reports() {
    return $this->belongsToMany('App\Report', 'quarter_report',  'quarter_id', 'report_id');
}
 }

扎希德·哈桑emon

您想将presidents表与president_report表连接。但是您president_report两次加入表。正确的方法应该是

$reports = Report::join('president_report', 'reports.id', '=','president_report.report_id')
    ->join('presidents', 'presidents.id', '=', 'president_report.president_id')
    ->join('quarter_report', 'president_report.report_id', '=', 'quarter_report.report_id')
    ->latest('reports.created_at')
    ->get();

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