Add relationship manager UI (#10268)

app/models/form/account_batch.rb

@@ -0,0 +1,60 @@
+# frozen_string_literal: true
+
+class Form::AccountBatch
+  include ActiveModel::Model
+
+  attr_accessor :account_ids, :action, :current_account
+
+  def save
+    case action
+    when 'unfollow'
+      unfollow!
+    when 'remove_from_followers'
+      remove_from_followers!
+    when 'block_domains'
+      block_domains!
+    end
+  end
+
+  private
+
+  def unfollow!
+    accounts.find_each do |target_account|
+      UnfollowService.new.call(current_account, target_account)
+    end
+  end
+
+  def remove_from_followers!
+    current_account.passive_relationships.where(account_id: account_ids).find_each do |follow|
+      reject_follow!(follow)
+    end
+  end
+
+  def block_domains!
+    AfterAccountDomainBlockWorker.push_bulk(account_domains) do |domain|
+      [current_account.id, domain]
+    end
+  end
+
+  def account_domains
+    accounts.pluck(Arel.sql('distinct domain')).compact
+  end
+
+  def accounts
+    Account.where(id: account_ids)
+  end
+
+  def reject_follow!(follow)
+    follow.destroy
+
+    return unless follow.account.activitypub?
+
+    json = ActiveModelSerializers::SerializableResource.new(
+      follow,
+      serializer: ActivityPub::RejectFollowSerializer,
+      adapter: ActivityPub::Adapter
+    ).to_json
+
+    ActivityPub::DeliveryWorker.perform_async(json, current_account.id, follow.account.inbox_url)
+  end
+end