Laravel.如何在外键是数组的情况下获取关系 [英] Laravel. How to get relationships where foreign key is an array
问题描述
我正在尝试检索数据库行及其关系.但是,本地键是一个数组.让我用一个例子来解释.
让我们说我有一个国家表和一个页面表.每个国家可以有很多页面.每个页面可以属于多个国家.我没有灵活性来更改此架构.
pages
+-------------+-----------+
| id | name | countries |
+-------------+-----------+
| 1 | Page 1 | 1 |
+-------------+-----------+
| 2 | Page 2 | 1,2,3 |
+-------------+-----------+
| 3 | Page 3 | 4,5,6 |
+-------------+-----------+
countries
+----+----------------+
| id | name |
+----+----------------+
| 1 | United States |
+----+----------------+
| 2 | United Kingdom |
+----+----------------+
| 3 | Germany |
+----+----------------+
| 4 | France |
+----+----------------+
| 5 | Hong Kong |
+----+----------------+
| 6 | Thailand |
+----+----------------+
| 7 | Belgium |
+----+----------------+
| 8 | Singapore |
+----+----------------+
我的模型和控制器如下所示:
country
public function pages()
{
return $this->hasMany(Page::class, 'id', 'countries');
}
MemberController.php
$countries = Country::with('pages')->get();
这将返回所有国家,但只有第1页包含任何关系.
是否可以使用whereIn方法检索关系,以便所有三个国家都能返回适当的页面?
预先感谢
由于Page
可以属于许多Countries
,因此您需要创建一个名为country_page
的数据透视表并删除countries
列.>
然后定义两个 belongsToMany()
关系型号:
public function pages()
{
return $this->belongsToMany(Page::class);
}
如果您不遵循Laravel命名约定在我的仓库中列出,并且您为数据透视表名称指定了自定义名称,也对其进行了定义:
public function pages()
{
return $this->belongsToMany(Page::class, 'custom_pivot_table');
}
I am trying to retrieve database rows with their relationships. However, the local key is an array. Let me explain using an example.
Lets say I have a table of countries and a table of pages. Each country can have many pages. Each page can belong to multiple countries. I do not have the flexibility to change this schema.
pages
+-------------+-----------+
| id | name | countries |
+-------------+-----------+
| 1 | Page 1 | 1 |
+-------------+-----------+
| 2 | Page 2 | 1,2,3 |
+-------------+-----------+
| 3 | Page 3 | 4,5,6 |
+-------------+-----------+
countries
+----+----------------+
| id | name |
+----+----------------+
| 1 | United States |
+----+----------------+
| 2 | United Kingdom |
+----+----------------+
| 3 | Germany |
+----+----------------+
| 4 | France |
+----+----------------+
| 5 | Hong Kong |
+----+----------------+
| 6 | Thailand |
+----+----------------+
| 7 | Belgium |
+----+----------------+
| 8 | Singapore |
+----+----------------+
My model and controller look something like:
country
public function pages()
{
return $this->hasMany(Page::class, 'id', 'countries');
}
MemberController.php
$countries = Country::with('pages')->get();
This is returning all countries, but only Page 1 contains any relationships.
Is there a way to retrieve relationships using a whereIn approach so all three countries will return appropriate pages?
Thanks in advance
Since Page
can belong to many Countries
, you need to create a pivot table called country_page
and remove the countries
column.
Then define two belongsToMany()
relationships in both models:
public function pages()
{
return $this->belongsToMany(Page::class);
}
If you're not following Laravel naming conventions listed in my repo and you gave the pivot name a custom name, define it too:
public function pages()
{
return $this->belongsToMany(Page::class, 'custom_pivot_table');
}
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