laravel 5.4 显示数据中的关系

Question

我有两个表，我想显示 :question_id.Question = question_id.QuestionOption 所在的所有字段。我不知道如何在 Laravel:

Schema::create('questions', function (Blueprint $table) {
    $table->increments('id');
    $table->string('question_text');
    $table->integer('points');
    $table->integer('temps_reponse');

    $table->integer('categories_id')->unsigned();
    $table->foreign('categories_id')->references('id')->on('categories');

    $table->integer('type_id')->unsigned();
    $table->foreign('type_id')->references('id')->on('types');

    $table->timestamps();

});

Schema::create('question_options', function (Blueprint $table) {
    $table->increments('id');
    $table->string('option_one');
    $table->string('option_two');
    $table->string('option_three');
    $table->string('correcte');

    $table->integer('question_id')->unsigned()->nullable();
    $table->foreign('question_id')->references('id')->on('questions');

    $table->timestamps();

});

我的 foreach 循环不起作用：

@foreach ($question_options as $question_option)
    <tbody>
        <tr>
            <td>{{ $question_option->question->id }}</td>
            <td>{{ $question_option->question->question_text }}</td>
            <td>{{ $question_option->option_one }}</td>
            <td>{{ $question_option->option_two }}</td>
            <td>{{ $question_option->option_three }}</td>
            <td>{{ $question_option->question->points }}</td>                                 
        </tr>   
    </tbody>
@endforeach

Answer 1

在模型中定义关系：

问题模型：

class Question extends Model {
    public $table = 'questions';

    public function options() {
        return $this->hasMany(QuestionOption::class);
    }
}

问题选项模型：

class QuestionOption extends Model {
    public $table = 'questions_options';

    public function question() {
        return $this->belongsTo(Question::class);
    }
}

从现在开始您可以访问选项问题选项：

$question = Question::with('options')->first();

在您看来：

@foreach($question->options as $question_option)
    <tbody>
        <tr>
            <td>{{ $question_option->question->id }}</td>
            <td>{{ $question_option->question->question_text }}</td>
            <td>{{ $question_option->option_one }}</td>
            <td>{{ $question_option->option_two }}</td>
            <td>{{ $question_option->option_three }}</td>
            <td>{{ $question_option->question->points }}</td>                                 
        </tr>   
    </tbody>
@endforeach

您可以直接从 $question 对象访问 question_text 而不是 $question_option->question->question_text。

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