X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/607fe087f6167061714a524dd53cbbc21b974973..efcfd2cdc9a9ed6ab3af54e9a4e149d4bdf1f8d3:/services/api/app/models/arvados_model.rb

diff --git a/services/api/app/models/arvados_model.rb b/services/api/app/models/arvados_model.rb
index 84897d04ef..bb33c5595a 100644
--- a/services/api/app/models/arvados_model.rb
+++ b/services/api/app/models/arvados_model.rb
@@ -46,6 +46,12 @@ class ArvadosModel < ActiveRecord::Base
     end
   end
 
+  class LockFailedError < StandardError
+    def http_status
+      422
+    end
+  end
+
   class InvalidStateTransitionError < StandardError
     def http_status
       422
@@ -98,6 +104,12 @@ class ArvadosModel < ActiveRecord::Base
     super(self.class.permit_attribute_params(raw_params), *args)
   end
 
+  # Reload "old attributes" for logging, too.
+  def reload(*args)
+    super
+    log_start_state
+  end
+
   def self.create raw_params={}, *args
     super(permit_attribute_params(raw_params), *args)
   end
@@ -184,6 +196,14 @@ class ArvadosModel < ActiveRecord::Base
     ["id", "uuid"]
   end
 
+  def self.limit_index_columns_read
+    # This method returns a list of column names.
+    # If an index request reads that column from the database,
+    # APIs that return lists will only fetch objects until reaching
+    # max_index_database_read bytes of data from those columns.
+    []
+  end
+
   # If current user can manage the object, return an array of uuids of
   # users and groups that have permission to write the object. The
   # first two elements are always [self.owner_uuid, current user's