How to resolve "You have requested a non-existent service cache.backend.permanent_database"
Install the PCB module
create a module.services.yml e.g. tea_voting.yml
services:
cache.voting:
class: Drupal\Core\Cache\CacheBackendInterface
tags:
- { name: cache.bin, default_backend: cache.backend.permanent_database }
# - { name: cache.bin}
factory: cache_factory:get
arguments: [voting]
Clear Drupal caches
Change the module.services.yml e.g. tea_voting.yml by removing the cache.backend.permanent_database so it looks like:
services:
cache.voting:
class: Drupal\Core\Cache\CacheBackendInterface
tags:
# - { name: cache.bin, default_backend: cache.backend.permanent_database }
- { name: cache.bin}
factory: cache_factory:get
arguments: [voting]
This effectively makes your cache.voting service a "normal" cache. i.e. it can be cleared with a Drupal cache clear.
Clear Drupal cache
notices the WSOD and error message:
You have requested a non-existent service "cache.backend.permanent_database". Did you mean this: "cache.backend.database"?
Now the Drupal database does not recover and the site has a WSOD.
To fix this truncate the cache_container table
Update the documentation to reflect this. Other solutions welcome
Postponed: needs info
3.1
Documentation
This looks like Drupal CORE issue, will try to dig a little.
I am sorry Selwyn, I tried with exact same steps with vanilla Drupal and PCB module but I am not able to reproduce the issue.
Is there any other customisation done around caches in your code?