FEATURE: allows to enable/disable threading in UI (#22307)

Enabling/Disabling threading has been possible through command line until now. This commit introduces two new UIs:

- When creating a channel, it will be available once the category has been selected
- On the settings page of a channel for admins

plugins/chat/app/controllers/chat/api/channels_controller.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 CHANNEL_EDITABLE_PARAMS = %i[name description slug]
-CATEGORY_CHANNEL_EDITABLE_PARAMS = %i[auto_join_users allow_channel_wide_mentions]
+CATEGORY_CHANNEL_EDITABLE_PARAMS = %i[auto_join_users allow_channel_wide_mentions threading_enabled]
 
 class Chat::Api::ChannelsController < Chat::ApiController
   def index
@@ -36,7 +36,14 @@ class Chat::Api::ChannelsController < Chat::ApiController
 
   def create
     channel_params =
-      params.require(:channel).permit(:chatable_id, :name, :slug, :description, :auto_join_users)
+      params.require(:channel).permit(
+        :chatable_id,
+        :name,
+        :slug,
+        :description,
+        :auto_join_users,
+        :threading_enabled,
+      )
 
     # NOTE: We don't allow creating channels for anything but category chatable types
     # at the moment. This may change in future, at which point we will need to pass in

plugins/chat/app/services/chat/create_category_channel.rb

@@ -10,6 +10,7 @@ module Chat
   #   description: "This is the best channel",
   #   slug: "super-channel",
   #   category_id: category.id,
+  #   threading_enabled: true,
   #  )
   #
   class CreateCategoryChannel
@@ -23,6 +24,7 @@ module Chat
     #   @option params_to_create [String] slug
     #   @option params_to_create [Boolean] auto_join_users
     #   @option params_to_create [Integer] category_id
+    #   @option params_to_create [Boolean] threading_enabled
     #   @return [Service::Base::Context]
 
     policy :can_create_channel
@@ -42,8 +44,12 @@ module Chat
       attribute :slug, :string
       attribute :category_id, :integer
       attribute :auto_join_users, :boolean, default: false
+      attribute :threading_enabled, :boolean, default: false
 
-      before_validation { self.auto_join_users = auto_join_users.presence || false }
+      before_validation do
+        self.auto_join_users = auto_join_users.presence || false
+        self.threading_enabled = threading_enabled.presence || false
+      end
 
       validates :category_id, presence: true
       validates :name, length: { maximum: SiteSetting.max_topic_title_length }
@@ -70,6 +76,7 @@ module Chat
         description: contract.description,
         user_count: 1,
         auto_join_users: contract.auto_join_users,
+        threading_enabled: contract.threading_enabled,
       )
     end
 

plugins/chat/app/services/chat/update_channel.rb

@@ -3,8 +3,8 @@
 module Chat
   # Service responsible for updating a chat channel's name, slug, and description.
   #
-  # For a CategoryChannel, the settings for auto_join_users and allow_channel_wide_mentions
-  # are also editable.
+  # For a CategoryChannel, the settings for auto_join_users, allow_channel_wide_mentions
+  # and threading_enabled are also editable.
   #
   # @example
   #  Service::Chat::UpdateChannel.call(
@@ -13,6 +13,7 @@ module Chat
   #   name: "SuperChannel",
   #   description: "This is the best channel",
   #   slug: "super-channel",
+  #   threading_enaled: true,
   #  )
   #
   class UpdateChannel
@@ -43,6 +44,7 @@ module Chat
       attribute :name, :string
       attribute :description, :string
       attribute :slug, :string
+      attribute :threading_enabled, :boolean, default: false
       attribute :auto_join_users, :boolean, default: false
       attribute :allow_channel_wide_mentions, :boolean, default: true