Question

如果这个问题之前已经回答过，我诚挚的道歉，但是我似乎没有找到类似的情况。如果重复，请指出正确的方向。

我有三个自定义表：

> app_expressions;
+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| id         | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| expression | varchar(191)     | NO   |     | NULL    |                |
| bot        | int(10) unsigned | NO   | MUL | NULL    |                |
+------------+------------------+------+-----+---------+----------------+

> app_links;
+-------------+------------------+------+-----+---------+----------------+
| Field       | Type             | Null | Key | Default | Extra          |
+-------------+------------------+------+-----+---------+----------------+
| id          | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| source      | varchar(10)      | NO   | MUL | NULL    |                |
| destination | varchar(10)      | NO   | MUL | NULL    |                |
| sid         | int(10) unsigned | NO   | MUL | NULL    |                |
| did         | int(10) unsigned | NO   | MUL | NULL    |                |
| bot         | int(10) unsigned | NO   | MUL | NULL    |                |
+-------------+------------------+------+-----+---------+----------------+

> app_replies;
+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| reply | text             | NO   |     | NULL    |                |
| bot   | int(10) unsigned | NO   | MUL | NULL    |                |
+-------+------------------+------+-----+---------+----------------+

app_expressions通过app_replies连接到app_links

假设每个表中只有一条记录。

app_expressions.id与app_links.sid中的app_links.source = 'expression'
app_replies.id与app_links.did中的app_links.destination = 'reply'

如何使用Laravel的hasOneThrough()在条件app_expressions下通过app_replies访问app_links从app_links.destination = 'reply'到<?php namespace App; use Illuminate\Database\Eloquent\Model; class Expressions extends Model { /* * Table */ protected $table = 'app_expressions'; /* * Get all replies linked with this record */ public function get_reply() { return $this -> hasOneThrough( 'App\Replies', 'App\Links', 'did', // Destination ID 'id', 'id', 'sid' // Source ID ) -> where('intermediary table.destination', '=', 'reply') ; } }的回复？伪代码如下：

userprofile

我希望我解释得很好。

Answer 1

在查询时在您的代码中可以使用何处来基于“通过表”过滤器来过滤表，例如：

$str='reply';
$data=Expressions::whereHas('get_reply',function($q) use($str){
$q->where('app_links.destination',$str);
})->get();

并且不要忘记在Expressions模型中删除此行：

-> where('intermediary table.destination', '=', 'reply') ;

Answer 2

解决了！我必须使用数据透视表特定的方法。这是供参考的代码。

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Expressions extends Model
{
    /*
    *   Table
    */
    protected $table = 'app_expressions';

    /*
    *   Get all replies linked with this record
    */
    public function get_reply()
    {
        return $this -> belongsToMany(
                            'App\Replies', // The destination table (app_replies)
                            'app_links',  // The pivot table; It can take a Model as argument as well (app_links)
                            'sid',        // Foreign key on pivot table (app_expressions.id on app_links.sid)
                            'did',        // Wanted key on pivot table (app_replies.id on app_links.did)
                            'id',         // Foreign key (app_expressions.id)
                            'id'          // Wanted key (app_replies.id)
                        )         

                        -> wherePivot('destination', 'reply'); // app_links.destination = 'reply'

    }

哲学：：如果app_replies和app_links，我将使用app_expressions通过app_links.sid = app_expressions.id访问app_links.destination = 'reply'到$app = new App\Expressions; $expression = $app -> first(); $reply = $expression -> get_reply;的记录。经过测试的修补程序代码：

\Illuminate\Database\Eloquent\Relations\BelongsToMany\HasRelationship

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Laravel hasOneThrough（）;中介表格自定义列值

2 个答案: