我正在尝试获取所有具有某些属性条件的 Entry 类。应该立即加载一种关系(标签)。
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');
}
}
存在双外键entry_id、tag_id的表entry_tag。
我正在尝试使用此代码。 (1)
$testEntries = Entry::with(array('tags' => function($query)
{
$query->where('tag_id', '=', '1');
}))->get();
但是,它什么也没返回。 即使使用下面的代码也完全没有效果。 (2)
$testEntries = Entry::with('tags')->get();
检查数据库日志,我可以看到查询正常。他们产生 (3)
select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?)","bindings":["1","2","3","4","5","6","7","8"]
和 (4)
select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?) and `tag_id` = ?","bindings":["1","2","3","4","5","6","7","8","1"]
在手动执行查询时两者都可以工作(并查找结果)。
我错过了什么?我已经挠头几个小时了!
编辑:
我尝试显示结果,但没有任何运气,如下所示
Log::debug('testing fetching entries:: ' . json_encode($testEntries));
和
foreach(Entry::with('tags')->get() as $entry)
{
Log::debug('test1!! ' . json_encode($entry));
}
编辑2: 我尝试过获取标签及其条目,就像这样
Tag::with('entries')->get();
但它(以及其他组合)每次都返回零结果。我想也许我在设置 table 的方式上错过了一些基本的东西。这是尝试 (2) 的完整 SQL 输出,以防有帮助。
{"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}
最佳答案
如果您使用软删除特征,请检查 deleted_at
是否具有默认值 NULL
。
关于php - Laravel 多对多急切加载总是返回空结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19508938/