在 Laravel 6 中删除嵌套的关联模型，跨多个数据库连接的情况下
1、查询关联时嵌套预加载的实现
$wpThemes = Theme::with(['themeInstallation.themeInstallationVersionPreset.themeInstallationTasks' => function ($query) {
$query->orderBy('id', 'desc');
}])->withCount(['logs'])->orderBy('updated_at_gmt', 'desc')->get()->makeHidden('content')->toArray();
2、打印执行的 SQL 语句
select
`wp_themes`.*,
(
select
count(*)
from
`wp_theme_logs`
where
`wp_themes`.`id` = `wp_theme_logs`.`theme_id`
) as `logs_count`
from
`wp_themes`
order by
`updated_at_gmt` desc;
select
*
from
`theme_installation`
where
`theme_installation`.`wp_theme_id` in (
1,
2,
3,
4,
5,
135,
136,
137,
140,
141,
142,
143,
144,
145,
146,
147,
148,
149,
150,
151,
152,
153,
154,
155,
156,
157,
158
);
select
*
from
`theme_installation_version_preset`
where
`theme_installation_version_preset`.`theme_installation_id` in (
27,
30,
31,
32,
33,
34,
35,
36,
37,
38,
39,
40,
41,
42,
43,
44,
45,
46,
47,
48
);
select
*
from
`theme_installation_task`
where
`theme_installation_task`.`theme_installation_version_preset_id` in (
27,
30,
31,
32,
33,
34,
35,
36,
37,
38,
39,
40,
41,
42,
43,
44,
45,
46,
47,
48
)
order by
`id` desc;
3、现在计划删除 wp_themes 表中的一条记录时，删除嵌套的关联模型(总计涉及到 3 个关联模型)。为何不在表之间设置级联外键关系，以便 DBMS 自动删除相关行，原因在于 wp_themes 在 A 数据库中，而 3 个关联模型在 B 数据库中。
4、最终实现如下
$theme = findOrFail($id); $theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete(); $theme->themeInstallation->themeInstallationVersionPreset()->delete(); $theme->themeInstallation()->delete(); $theme->delete();
5、执行时报错：SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘object_store.themes’ doesn’t exist (SQL: delete from `themes` where `id` = 156) 。提示：wp_themes 在 B 数据库中不存在。实则 wp_themes 应该在 A 数据库中的。报错所在行：$theme->delete(); 。虽然关联的 3 个模型已经被成功删除。如图1
![执行时报错：SQLSTATE[42S02]: Base table or view not found: 1146 Table 'object_store.themes' doesn't exist (SQL: delete from `themes` where `id` = 156) 。](https://www.shuijingwanwq.com/wp-content/uploads/2022/07/1-1.png)
图1
{
"message": "SQLSTATE[42S02]: Base table or view not found: 1146 Table 'object_store.themes' doesn't exist (SQL: delete from `themes` where `id` = 156)",
"code": "42S02",
"status_code": 500,
"debug": {
"line": 669,
"file": "E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php",
"class": "Illuminate\\Database\\QueryException",
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"#51 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Dingo\\Api\\Http\\Middleware\\Request->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#52 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))",
"#53 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(145): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#54 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(110): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))",
"#55 E:\\wwwroot\\object\\public\\index.php(57): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))",
"#56 {main}"
]
}
}
}
6、虽然关联的 3 个模型已经被成功删除。如图2
图2
7、打印 $theme 对象，发现其连接已经被修改为默认的 B 数据库所对应的连接。并非模型对象中默认的 A 数据库所对应的连接。如图3
图3
8、决定在删除 $theme 对象前，重新设置其连接为 A 。最终实现如下
$theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete();
$theme->themeInstallation->themeInstallationVersionPreset()->delete();
$theme->themeInstallation()->delete();
$theme->logs()->delete();
$theme->customPages()->delete();
$theme->setConnection('wordpress')->delete();
9、生成的删除 SQL 不再报错。分别查看 A、B 数据库中的数据，确认已被删除。如图4
图4
select * from `wp_themes` where `wp_themes`.`id` = 157 limit 1; select * from `theme_installation` where `theme_installation`.`wp_theme_id` in (157); select * from `theme_installation_version_preset` where `theme_installation_version_preset`.`theme_installation_id` = 47 and `theme_installation_version_preset`.`theme_installation_id` is not null limit 1; delete from `theme_installation_task` where `theme_installation_task`.`theme_installation_version_preset_id` = 47 and `theme_installation_task`.`theme_installation_version_preset_id` is not null; delete from `theme_installation_version_preset` where `theme_installation_version_preset`.`theme_installation_id` = 47 and `theme_installation_version_preset`.`theme_installation_id` is not null; delete from `theme_installation` where `theme_installation`.`wp_theme_id` = 157 and `theme_installation`.`wp_theme_id` is not null; delete from `wp_themes` where `id` = 157;
10、当一些关联不存在时，会报错：Trying to get property ‘themeInstallationVersionPreset’ of non-object。原因在于 $theme->themeInstallation 为 null。所以需要判断关联对象是否存在。如图5
图5
11、最终实现如下
if (isset($theme->themeInstallation)) {
$theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete();
$theme->themeInstallation->themeInstallationVersionPreset()->delete();
$theme->themeInstallation()->delete();
}
$theme->setConnection('wordpress')->delete();
12、$theme->themeInstallation 为 null 时生成的删除 SQL 不再报错。
select * from `wp_themes` where `wp_themes`.`id` = 135 limit 1; select * from `theme_installation` where `theme_installation`.`wp_theme_id` in (135); delete from `wp_themes` where `id` = 135;
13、$theme->themeInstallation 不为 null 时生成的删除 SQL 也不再报错。如图6
图6
select * from `wp_themes` where `wp_themes`.`id` = 143 limit 1; select * from `theme_installation` where `theme_installation`.`wp_theme_id` in (143); select * from `theme_installation_version_preset` where `theme_installation_version_preset`.`theme_installation_id` = 33 and `theme_installation_version_preset`.`theme_installation_id` is not null limit 1; delete from `theme_installation_task` where `theme_installation_task`.`theme_installation_version_preset_id` = 33 and `theme_installation_task`.`theme_installation_version_preset_id` is not null; delete from `theme_installation_version_preset` where `theme_installation_version_preset`.`theme_installation_id` = 33 and `theme_installation_version_preset`.`theme_installation_id` is not null; delete from `theme_installation` where `theme_installation`.`wp_theme_id` = 143 and `theme_installation`.`wp_theme_id` is not null; delete from `wp_themes` where `id` = 143;
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