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我想獲取所有類的條目,其中有一些條件屬性。一個關係,標籤,應該急切加載。Laravel多對多急切加載總是返回空結果
的模型看起來像雙外鍵,entry_id,TAG_ID所以
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');
}
}
表entry_tag,存在。
我正嘗試使用此代碼。 (1)
$testEntries = Entry::with(array('tags' => function($query)
{
$query->where('tag_id', '=', '1');
}))->get();
但是,它沒有返回。 即使使用下面的代碼也會產生完全的zilch。 (2)
$testEntries = Entry::with('tags')->get();
檢查數據庫日誌,我可以看到,查詢都OK。它們產生 (3)
select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?)","bindings":["1","2","3","4","5","6","7","8"]
和 手動執行查詢時(4)
select `tags`.*, `entry_tag`.`entry_id` as `pivot_entry_id`, `entry_tag`.`tag_id` as `pivot_tag_id` from `tags` inner join `entry_tag` on `tags`.`id` = `entry_tag`.`tag_id` where `entry_tag`.`entry_id` in (?, ?, ?, ?, ?, ?, ?, ?) and `tag_id` = ?","bindings":["1","2","3","4","5","6","7","8","1"]
其中兩個工作(並且發現結果)。
我錯過了什麼?我現在幾個小時就撓了腦袋!
編輯:
我已經試過顯示結果,沒有任何運氣,像下面
Log::debug('testing fetching entries:: ' . json_encode($testEntries));
和
foreach(Entry::with('tags')->get() as $entry)
{
Log::debug('test1!! ' . json_encode($entry));
}
編輯2: 我曾嘗試用他們的條目獲取標籤,如
Tag::with('entries')->get();
但它(連同其他組合)每次都返回零結果。我想也許我已經錯過了我設置牌桌的方式。這裏是完整的sql輸出嘗試(2),以防萬一。
{"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}
不確定這是否有幫助,但嘗試定義您的BelongsToMany()關係,如下所示:'return $ this-> belongsToMany('Entry','entry_tag','entry_id','tag_id');'and vice在Entry表中輸入 –
你如何試圖顯示結果?也許在那裏有一個錯字。 – user1669496
@GladToHelp,沒有變化。由於它目前創建了成功的SQL查詢(查看數據庫日誌),所以沒有什麼區別。 –