Fix get version data with full name of class

lib/paper_trail/reifiers/belongs_to.rb

@@ -37,7 +37,7 @@ def load_record(assoc, id, options, version)
         # @api private
         def load_version(assoc, id, transaction_id, version_at)
           assoc.klass.paper_trail.version_class.
-            where("item_type = ?", assoc.class_name).
+            where("item_type = ?", assoc.klass.name).
             where("item_id = ?", id).
             where("created_at >= ? OR transaction_id = ?", version_at, transaction_id).
             order("id").limit(1).first

lib/paper_trail/reifiers/has_many.rb

@@ -98,7 +98,7 @@ def load_versions_for_hm_association(assoc, model, version_table, tx_id, version
             select("MIN(version_id)").
             where("foreign_key_name = ?", assoc.foreign_key).
             where("foreign_key_id = ?", model.id).
-            where("#{version_table}.item_type = ?", assoc.class_name).
+            where("#{version_table}.item_type = ?", assoc.klass.name).
             where("created_at >= ? OR transaction_id = ?", version_at, tx_id).
             group("item_id").
             to_sql

lib/paper_trail/reifiers/has_many_through.rb

@@ -73,7 +73,7 @@ def collection_through_belongs_to(through_collection, assoc, options, tx_id)
         def load_versions_for_hmt_association(assoc, ids, tx_id, version_at)
           version_id_subquery = assoc.klass.paper_trail.version_class.
             select("MIN(id)").
-            where("item_type = ?", assoc.class_name).
+            where("item_type = ?", assoc.klass.name).
             where("item_id IN (?)", ids).
             where(
               "created_at >= ? OR transaction_id = ?",

lib/paper_trail/reifiers/has_one.rb

@@ -36,7 +36,7 @@ def load_version_for_has_one(assoc, model, transaction_id, version_at)
           model.class.paper_trail.version_class.joins(:version_associations).
             where("version_associations.foreign_key_name = ?", assoc.foreign_key).
             where("version_associations.foreign_key_id = ?", model.id).
-            where("#{version_table_name}.item_type = ?", assoc.class_name).
+            where("#{version_table_name}.item_type = ?", assoc.klass.name).
             where("created_at >= ? OR transaction_id = ?", version_at, transaction_id).
             order("#{version_table_name}.id ASC").
             first