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[rails.git] / app / models / relation.rb

diff --git a/app/models/relation.rb b/app/models/relation.rb
index b19f8aeb147d34b1b49422572671ca1e8bce72e9..cb9621822ba63cefd1349318f28c8947765ec829 100644 (file)
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -186,7 +186,7 @@ class Relation < ActiveRecord::Base
       self.lock!
       check_consistency(self, new_relation, user)
       # This will check to see if this relation is used by another relation
-      rel = RelationMember.joins(:relation).where("visible = ? AND member_type = 'Relation' and member_id = ? ", true, id).first
+      rel = RelationMember.joins(:relation).find_by("visible = ? AND member_type = 'Relation' and member_id = ? ", true, id)
       fail OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is used in relation #{rel.relation.id}.") unless rel.nil?
 
       self.changeset_id = new_relation.changeset_id
@@ -246,8 +246,10 @@ class Relation < ActiveRecord::Base
 
       # use reflection to look up the appropriate class
       model = Kernel.const_get(m[0].capitalize)
-      # get the element with that ID
-      element = model.where(:id => m[1]).first
+      # get the element with that ID. and, if found, lock the element to
+      # ensure it can't be deleted until after the current transaction
+      # commits.
+      element = model.lock("for share").find_by(:id => m[1])
 
       # and check that it is OK to use.
       unless element && element.visible? && element.preconditions_ok?