Eloquent:在关系上调用 Where-数据库问题

Eloquent: Calling Where on a relation(Eloquent:在关系上调用 Where)

本文介绍了Eloquent:在关系上调用 Where的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下 Eloquent ORM 查询.

I have the following Eloquent ORM query.

$products2 = Product::with('metal', 'metal.fixes', 'metal.fixes.currency')
    ->where('metal_id', '=', 1)
    ->get()->toArray();

此查询的输出如下:

http://pastebin.com/JnDi7swv

我希望进一步缩小查询范围，只显示fixes.currency_id = 1 的产品.

I wish to further narrow down my query to only display products where fixes.currency_id = 1.

$products2 = Product::with('metal', 'metal.fixes', 'metal.fixes.currency')
    ->where('metal_id', '=', 1)
    ->where('metal.fixes.currency_id', '=', 1)
    ->get()->toArray();

有人可以帮我解决这个问题吗，因为我收到以下错误:

Could somebody help me with this second where please because I am getting the following error:

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'metal.fixes.currency_id' 
in 'where clause' (SQL: select * from `products` where `metal_id` = ? 
and `metal`.`fixes`.`currency_id` = ?) (Bindings: array ( 0 => 1, 1 => 1, ))

在 Rob Gordijn 的帮助下解决了:

Solved with the help of Rob Gordijn:

$products2 = Product::with(array(
    'metal', 
    'metal.fixes.currency', 
    'metal.fixes' => function($query){
        $query->where('currency_id', '=', 1);
     }))
        ->where('common', '=', 1)
        ->where('metal_id', '=', 1)
        ->get()->toArray();

推荐答案

您正在寻找Eager Load Constraints":http://laravel.com/docs/eloquent#querying-relations

You are looking for "Eager Load Constraints": http://laravel.com/docs/eloquent#querying-relations

<?php
$products2 = Product::with(array('metal', 'metal.fixes', 'metal.fixes.currency' => function($query){
    $query->where('currency_id', '=', 1);
}))
->where('metal_id', '=', 1)
->get()->toArray();

这篇关于Eloquent:在关系上调用 Where的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！