Attempt to recreate deleted chat channel with the same name (still) fails

Bug
8

I checked and this is actually expected, since we exclude records with deleted_at filled in even with find_by:

ChatChannel.find_by(slug: "sec-fhir")
  ChatChannel Load (0.4ms)  SELECT "chat_channels".* FROM "chat_channels" WHERE "chat_channels"."deleted_at" IS NULL AND "chat_channels"."slug" = 'sec-fhir' LIMIT 1
=> nil

You will need to do this instead (adding with_deleted):

ChatChannel.with_deleted.find_by(slug: "sec-fhir")
  ChatChannel Load (0.3ms)  SELECT "chat_channels".* FROM "chat_channels" WHERE "chat_channels"."slug" = 'sec-fhir' LIMIT 1
=> #<CategoryChannel:0x00007fc9bfb4abf0
 id: 124,
 chatable_id: 19,
 deleted_at: Wed, 15 Feb 2023 01:19:20.982181000 UTC +00:00,
 deleted_by_id: nil,
 featured_in_category_id: nil,
 delete_after_seconds: nil,
 chatable_type: "Category",
 created_at: Fri, 13 Jan 2023 01:46:43.730329000 UTC +00:00,
 updated_at: Wed, 15 Feb 2023 01:19:56.427647000 UTC +00:00,
 name: "test channel",
 description: "",
 status: "archived",
 user_count: 1,
 last_message_sent_at: Fri, 13 Jan 2023 01:46:51.130903000 UTC +00:00,
 auto_join_users: false,
 user_count_stale: false,
 slug: "sec-fhir",
 type: "CategoryChannel",
 allow_channel_wide_mentions: true,
 messages_count: 0,
 threading_enabled: false>

So to clear out the old deleted channel slug do something like this:

channel = ChatChannel.with_deleted.find_by(slug: "sec-fhir")
channel.update!(slug: "#{channel.deleted_at.strftime("%Y%m%d-%H%M")}-#{channel.slug}-deleted")

Maybe we need a migration to fix these @mcwumbly and @joffreyjaffeux ?

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