X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/df91e9651a0075415a257be97f0a92be061141d3..e34d6859d936f0b82f981d44be415a46b1aa61e1:/services/api/lib/current_api_client.rb

diff --git a/services/api/lib/current_api_client.rb b/services/api/lib/current_api_client.rb
index 94bd2b56a8..4c26010d2a 100644
--- a/services/api/lib/current_api_client.rb
+++ b/services/api/lib/current_api_client.rb
@@ -100,18 +100,24 @@ module CurrentApiClient
 
   def act_as_system_user
     if block_given?
-      user_was = Thread.current[:user]
-      Thread.current[:user] = system_user
-      begin
+      act_as_user system_user do
         yield
-      ensure
-        Thread.current[:user] = user_was
       end
     else
       Thread.current[:user] = system_user
     end
   end
 
+  def act_as_user user
+    user_was = Thread.current[:user]
+    Thread.current[:user] = user
+    begin
+      yield
+    ensure
+      Thread.current[:user] = user_was
+    end
+  end
+
   def anonymous_group
     if not $anonymous_group
       act_as_system_user do
@@ -158,4 +164,20 @@ module CurrentApiClient
     $anonymous_user
   end
 
+  def empty_collection_uuid
+    'd41d8cd98f00b204e9800998ecf8427e+0'
+  end
+
+  def empty_collection
+    if not $empty_collection
+      act_as_system_user do
+        ActiveRecord::Base.transaction do
+          $empty_collection = Collection.
+            where(portable_data_hash: empty_collection_uuid).
+            first_or_create!(manifest_text: '', owner_uuid: anonymous_group.uuid)
+        end
+      end
+    end
+    $empty_collection
+  end
 end