1. Implementation of nested eager loading when querying associations
PHP
$wpThemes = Theme::with(['themeInstallation.themeInstallationVersionPreset.themeInstallationTasks' => function ($query) {
$query->orderBy('id', 'desc');
}])->withCount(['logs'])->orderBy('updated_at_gmt', 'desc')->get()->makeHidden('content')->toArray();
2. Print the executed SQL statements
SQL
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. Now, when planning to delete a record from the wp_themes table, delete the nested associated models (involving a total of 3 associated models). The reason for not setting up cascading foreign key relationships between tables for the DBMS to automatically delete related rows is that wp_themes is in database A, while the 3 associated models are in database B.
4. The final implementation is as follows
PHP
$theme = findOrFail($id);
$theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete();
$theme->themeInstallation->themeInstallationVersionPreset()->delete();
$theme->themeInstallation()->delete();
$theme->delete();
5. An error is reported upon execution: SQLSTATE[42S02]: Base table or view not found: 1146 Table ‘object_store.themes’ doesn’t exist (SQL: delete from `themes` where `id` = 156). Note: wp_themes does not exist in database B. In reality, wp_themes should be in database A. The line where the error occurs: $theme->delete();. Although the 3 associated models have been successfully deleted. As shown in Figure 1
![Error reported upon execution: SQLSTATE[42S02]: Base table or view not found: 1146 Table 'object_store.themes' doesn't exist (SQL: delete from `themes` where `id` = 156).](https://media.shuijingwanwq.com/2022/07/1-1.png)
JSON
{
"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",
"trace": {
"previous": [
"#0 E:\\wwwroot\\object\\vendor\\doctrine\\dbal\\lib\\Doctrine\\DBAL\\Driver\\PDOConnection.php(87): Doctrine\\DBAL\\Driver\\PDO\\Exception::new(Object(PDOException))",
"#1 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(484): Doctrine\\DBAL\\Driver\\PDOConnection->prepare('delete from `th...')",
"#2 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(662): Illuminate\\Database\\Connection->Illuminate\\Database\\{closure}('delete from `th...', Array)",
"#3 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(629): Illuminate\\Database\\Connection->runQueryCallback('delete from `th...', Array, Object(Closure))",
"#4 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(495): Illuminate\\Database\\Connection->run('delete from `th...', Array, Object(Closure))",
"#5 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(440): Illuminate\\Database\\Connection->affectingStatement('delete from `th...', Array)",
"#6 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Query\\Builder.php(2823): Illuminate\\Database\\Connection->delete('delete from `th...', Array)",
"#7 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Builder.php(874): Illuminate\\Database\\Query\\Builder->delete()",
"#8 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Model.php(936): Illuminate\\Database\\Eloquent\\Builder->delete()",
"#9 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Model.php(907): Illuminate\\Database\\Eloquent\\Model->performDeleteOnModel()",
"#10 E:\\wwwroot\\object\\app\\Services\\ThemeService.php(198): Illuminate\\Database\\Eloquent\\Model->delete()",
"#11 E:\\wwwroot\\object\\app\\Http\\Controllers\\Admin\\API\\ThemeController.php(165): App\\Services\\ThemeService->delete(156)",
"#12 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Controller.php(54): App\\Http\\Controllers\\Admin\\API\\ThemeController->destroy('156', Object(App\\Services\\ThemeService))",
"#13 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction('destroy', Array)",
"#14 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(219): Illuminate\\Routing\\ControllerDispatcher->dispatch(Object(Illuminate\\Routing\\Route), Object(App\\Http\\Controllers\\Admin\\API\\ThemeController), 'destroy')",
"#15 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(176): Illuminate\\Routing\\Route->runController()",
"#16 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(681): Illuminate\\Routing\\Route->run()",
"#17 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(130): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#18 E:\\wwwroot\\object\\vendor\\spatie\\laravel-permission\\src\\Middlewares\\RoleOrPermissionMiddleware.php(25): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#19 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Spatie\\Permission\\Middlewares\\RoleOrPermissionMiddleware->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure), 'manage_themes|a...')",
"#20 E:\\wwwroot\\object\\app\\Http\\Middleware\\CheckStoreAdminStatus.php(45): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#21 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\CheckStoreAdminStatus->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#22 E:\\wwwroot\\object\\app\\Http\\Middleware\\SwitchLanguage.php(28): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#23 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\SwitchLanguage->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#24 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Auth.php(55): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#25 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Dingo\\Api\\Http\\Middleware\\Auth->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#26 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Auth\\Middleware\\Authenticate.php(43): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#27 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Auth\\Middleware\\Authenticate->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure), 'api')",
"#28 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\PrepareController.php(45): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#29 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Dingo\\Api\\Http\\Middleware\\PrepareController->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#30 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#31 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(683): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#32 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(658): Illuminate\\Routing\\Router->runRouteWithinStack(Object(Illuminate\\Routing\\Route), Object(Dingo\\Api\\Http\\Request))",
"#33 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(624): Illuminate\\Routing\\Router->runRoute(Object(Dingo\\Api\\Http\\Request), Object(Illuminate\\Routing\\Route))",
"#34 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(613): Illuminate\\Routing\\Router->dispatchToRoute(Object(Dingo\\Api\\Http\\Request))",
"#35 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Routing\\Adapter\\Laravel.php(88): Illuminate\\Routing\\Router->dispatch(Object(Dingo\\Api\\Http\\Request))",
"#36 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Routing\\Router.php(518): Dingo\\Api\\Routing\\Adapter\\Laravel->dispatch(Object(Dingo\\Api\\Http\\Request), 'v1')",
"#37 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(126): Dingo\\Api\\Routing\\Router->dispatch(Object(Dingo\\Api\\Http\\Request))",
"#38 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(130): Dingo\\Api\\Http\\Middleware\\Request->Dingo\\Api\\Http\\Middleware\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#39 E:\\wwwroot\\object\\app\\Http\\Middleware\\ChangeAppUrlMiddleware.php(23): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#40 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\ChangeAppUrlMiddleware->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#41 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#42 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#43 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#44 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#45 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#46 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#47 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode.php(63): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#48 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#49 E:\\wwwroot\\object\\vendor\\fideloper\\proxy\\src\\TrustProxies.php(57): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#50 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Fideloper\\Proxy\\TrustProxies->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#51 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#52 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(127): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#53 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(103): Dingo\\Api\\Http\\Middleware\\Request->sendRequestThroughRouter(Object(Dingo\\Api\\Http\\Request))",
"#54 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))",
"#55 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Illuminate\\Http\\Request))",
"#56 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(145): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#57 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Kernel.php(110): Illuminate\\Foundation\\Http\\Kernel->sendRequestThroughRouter(Object(Illuminate\\Http\\Request))",
"#58 E:\\wwwroot\\object\\public\\index.php(57): Illuminate\\Foundation\\Http\\Kernel->handle(Object(Illuminate\\Http\\Request))",
"#59 {main}"
],
"current": [
"#0 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(629): Illuminate\\Database\\Connection->runQueryCallback('delete from `th...', Array, Object(Closure))",
"#1 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(495): Illuminate\\Database\\Connection->run('delete from `th...', Array, Object(Closure))",
"#2 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Connection.php(440): Illuminate\\Database\\Connection->affectingStatement('delete from `th...', Array)",
"#3 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Query\\Builder.php(2823): Illuminate\\Database\\Connection->delete('delete from `th...', Array)",
"#4 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Builder.php(874): Illuminate\\Database\\Query\\Builder->delete()",
"#5 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Model.php(936): Illuminate\\Database\\Eloquent\\Builder->delete()",
"#6 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Database\\Eloquent\\Model.php(907): Illuminate\\Database\\Eloquent\\Model->performDeleteOnModel()",
"#7 E:\\wwwroot\\object\\app\\Services\\ThemeService.php(198): Illuminate\\Database\\Eloquent\\Model->delete()",
"#8 E:\\wwwroot\\object\\app\\Http\\Controllers\\Admin\\API\\ThemeController.php(165): App\\Services\\ThemeService->delete(156)",
"#9 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Controller.php(54): App\\Http\\Controllers\\Admin\\API\\ThemeController->destroy('156', Object(App\\Services\\ThemeService))",
"#10 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\ControllerDispatcher.php(45): Illuminate\\Routing\\Controller->callAction('destroy', Array)",
"#11 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(219): Illuminate\\Routing\\ControllerDispatcher->dispatch(Object(Illuminate\\Routing\\Route), Object(App\\Http\\Controllers\\Admin\\API\\ThemeController), 'destroy')",
"#12 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Route.php(176): Illuminate\\Routing\\Route->runController()",
"#13 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(681): Illuminate\\Routing\\Route->run()",
"#14 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(130): Illuminate\\Routing\\Router->Illuminate\\Routing\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#15 E:\\wwwroot\\object\\vendor\\spatie\\laravel-permission\\src\\Middlewares\\RoleOrPermissionMiddleware.php(25): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#16 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Spatie\\Permission\\Middlewares\\RoleOrPermissionMiddleware->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure), 'manage_themes|a...')",
"#17 E:\\wwwroot\\object\\app\\Http\\Middleware\\CheckStoreAdminStatus.php(45): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#18 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\CheckStoreAdminStatus->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#19 E:\\wwwroot\\object\\app\\Http\\Middleware\\SwitchLanguage.php(28): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#20 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\SwitchLanguage->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#21 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Auth.php(55): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#22 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Dingo\\Api\\Http\\Middleware\\Auth->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#23 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Auth\\Middleware\\Authenticate.php(43): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#24 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Auth\\Middleware\\Authenticate->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure), 'api')",
"#25 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\PrepareController.php(45): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#26 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Dingo\\Api\\Http\\Middleware\\PrepareController->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#27 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#28 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(683): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#29 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(658): Illuminate\\Routing\\Router->runRouteWithinStack(Object(Illuminate\\Routing\\Route), Object(Dingo\\Api\\Http\\Request))",
"#30 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(624): Illuminate\\Routing\\Router->runRoute(Object(Dingo\\Api\\Http\\Request), Object(Illuminate\\Routing\\Route))",
"#31 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Routing\\Router.php(613): Illuminate\\Routing\\Router->dispatchToRoute(Object(Dingo\\Api\\Http\\Request))",
"#32 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Routing\\Adapter\\Laravel.php(88): Illuminate\\Routing\\Router->dispatch(Object(Dingo\\Api\\Http\\Request))",
"#33 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Routing\\Router.php(518): Dingo\\Api\\Routing\\Adapter\\Laravel->dispatch(Object(Dingo\\Api\\Http\\Request), 'v1')",
"#34 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(126): Dingo\\Api\\Routing\\Router->dispatch(Object(Dingo\\Api\\Http\\Request))",
"#35 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(130): Dingo\\Api\\Http\\Middleware\\Request->Dingo\\Api\\Http\\Middleware\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#36 E:\\wwwroot\\object\\app\\Http\\Middleware\\ChangeAppUrlMiddleware.php(23): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#37 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): App\\Http\\Middleware\\ChangeAppUrlMiddleware->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#38 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#39 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#40 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest.php(21): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#41 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\TransformsRequest->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#42 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize.php(27): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#43 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\ValidatePostSize->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#44 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode.php(63): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#45 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Illuminate\\Foundation\\Http\\Middleware\\CheckForMaintenanceMode->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#46 E:\\wwwroot\\object\\vendor\\fideloper\\proxy\\src\\TrustProxies.php(57): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#47 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(171): Fideloper\\Proxy\\TrustProxies->handle(Object(Dingo\\Api\\Http\\Request), Object(Closure))",
"#48 E:\\wwwroot\\object\\vendor\\laravel\\framework\\src\\Illuminate\\Pipeline\\Pipeline.php(105): Illuminate\\Pipeline\\Pipeline->Illuminate\\Pipeline\\{closure}(Object(Dingo\\Api\\Http\\Request))",
"#49 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(127): Illuminate\\Pipeline\\Pipeline->then(Object(Closure))",
"#50 E:\\wwwroot\\object\\vendor\\dingo\\api\\src\\Http\\Middleware\\Request.php(103): Dingo\\Api\\Http\\Middleware\\Request->sendRequestThroughRouter(Object(Dingo\\Api\\Http\\Request))",
"#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. Although the 3 associated models have been successfully deleted. As shown in Figure 2
7. Printing the $theme object reveals that its connection has been changed to the connection corresponding to the default database B. It is no longer the connection corresponding to the default database A in the model object. As shown in Figure 3
8. Decided to reset its connection to A before deleting the $theme object. The final implementation is as follows
PHP
$theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete();
$theme->themeInstallation->themeInstallationVersionPreset()->delete();
$theme->themeInstallation()->delete();
$theme->logs()->delete();
$theme->customPages()->delete();
$theme->setConnection('wordpress')->delete();
9. The generated delete SQL no longer reports an error. Check the data in databases A and B respectively to confirm they have been deleted. As shown in Figure 4
SQL
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. When some associations do not exist, an error is reported: Trying to get property ‘themeInstallationVersionPreset’ of non-object. The reason is that $theme->themeInstallation is null. Therefore, it is necessary to check whether the associated object exists. As shown in Figure 5
11. The final implementation is as follows
PHP
if (isset($theme->themeInstallation)) {
$theme->themeInstallation->themeInstallationVersionPreset->themeInstallationTasks()->delete();
$theme->themeInstallation->themeInstallationVersionPreset()->delete();
$theme->themeInstallation()->delete();
}
$theme->setConnection('wordpress')->delete();
12. The generated delete SQL no longer reports an error when $theme->themeInstallation is null.
SQL
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. The generated delete SQL no longer reports an error when $theme->themeInstallation is not null. As shown in Figure 6
SQL
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;