lib/sequel/model.rb in sequel-3.34.1 vs lib/sequel/model.rb in sequel-3.35.0

@@ -33,20 +33,20 @@
   #   # Using a database
   #   class Comment < Sequel::Model(DB1)
   #     dataset # => DB1[:comments]
   #   end
   def self.Model(source)
-    if Sequel::Model.cache_anonymous_models && (klass = Model::ANONYMOUS_MODEL_CLASSES[source])
+    if Sequel::Model.cache_anonymous_models && (klass = Sequel.synchronize{Model::ANONYMOUS_MODEL_CLASSES[source]})
       return klass
     end
     klass = if source.is_a?(Database)
       c = Class.new(Model)
       c.db = source
       c
     else
       Class.new(Model).set_dataset(source)
     end
-    Model::ANONYMOUS_MODEL_CLASSES[source] = klass if Sequel::Model.cache_anonymous_models
+    Sequel.synchronize{Model::ANONYMOUS_MODEL_CLASSES[source] = klass} if Sequel::Model.cache_anonymous_models
     klass
   end
 
   # <tt>Sequel::Model</tt> is an object relational mapper built on top of Sequel core.  Each
   # model class is backed by a dataset instance, and many dataset methods can be