Question

我正在尝试获取所有Entry类，并在其属性上添加一些条件。一个关系，标签，应该是渴望加载。

模型看起来像这样

class Tag extends Eloquent {
    protected $table = 'tags';
    protected $guarded = array();
    public function entries()
    {
        return $this->belongsToMany('Entry');
    }
}

class Entry extends Eloquent {
    protected $table = 'entries';
    protected $guarded = array();
    public function tags()
    {
        return $this->belongsToMany('Tag');
    }

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

    public function votes()
    {
        return $this->hasMany('Votes');
    }
}

具有双重外键的表entry_tag，entry_id，tag_id，存在。

我正在尝试使用此代码。的（1）

$testEntries = Entry::with(array('tags' => function($query)
{
    $query->where('tag_id', '=', '1');
}))->get();

但是，它什么也没有返回。甚至使用下面的代码产生完全zilch。的（2）

$testEntries = Entry::with('tags')->get();

检查数据库日志，我可以看到查询正常。他们屈服的（3）

select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?)","bindings":["1","2","3","4","5","6","7","8"]

和的（4）

select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?) and `tag_id` = ?","bindings":["1","2","3","4","5","6","7","8","1"]

在手动执行查询时都可以工作（并找到结果）。

我错过了什么？我现在已经抓了几个小时了！

修改

我试过显示结果，没有任何运气，如下所示

Log::debug('testing fetching entries:: ' . json_encode($testEntries));

和

foreach(Entry::with('tags')->get() as $entry)
        {
            Log::debug('test1!! ' . json_encode($entry));           
        }

编辑2： 我已经尝试使用其条目获取标签，如此

Tag::with('entries')->get();

但它（以及其他组合）每次都会返回零结果。我想也许我已经错过了我设置表格的方式。这是尝试（2）的完整sql输出，如果它有帮助。

{"query":"select * from `entries`","bindings":[],"time":0.33},{"query":"select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?)","bindings":["1","2","3","4","5","6","7","8"],"time":0.74}

Answer 1

如果您使用软删除特征，请检查deleted_at是否有默认值NULL。

Laravel很多很多渴望加载总是返回空结果

1 个答案: