Laravel hasOneThrough();中间 table 自定义列值

Question

如果之前有人回答过这个问题，我深表歉意，但我似乎没有找到类似的情况。如果是重复的，请指出正确的方向。

我有三个自定义 table：

> 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_links

连接到 app_replies

假设我在每个 table.

中有一条记录

app_expressions.id 与 app_links.sid 相同，其中 app_links.source = 'expression'
app_replies.id 与 app_links.did 相同，其中 app_links.destination = 'reply'

如何使用 Laravel 的 hasOneThrough() 访问 app_expressions 从 app_replies 到 app_links 的回复，条件是 app_links.destination = 'reply'？下面的伪代码：

<?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 -> hasOneThrough(
            'App\Replies',
            'App\Links',
            'did',  // Destination ID
            'id',  
            'id',
            'sid'   // Source ID
        ) -> where('intermediary table.destination', '=', 'reply') ;
    }
}

希望我解释的很好

Answer 1

在您查询时的代码中，您可以使用 WhereHas 根据 Through table 过滤器过滤您的 table 例如：

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

别忘了在表达式模型上删除这一行：

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

Answer 2

解决了！我不得不使用 pivot table 特定的方法。下面是参考代码。

<?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： 我正在访问 app_replies 到 app_links 的记录，使用 app_expressions，如果 app_links.sid = app_expressions.id 和app_links.destination = 'reply'。以下修补程序的测试代码：

$app = new App\Expressions;

$expression = $app -> first();

$reply = $expression -> get_reply;

有关更多信息，我建议寻找在 \Illuminate\Database\Eloquent\Relations\BelongsToMany\HasRelationship

上声明的方法的参数

Laravel hasOneThrough();中间 table 自定义列值

Laravel hasOneThrough(); intermediary table custom column value

php

orm

laravel

eloquent

has-one-through