diff --git a/lib/ancestry/materialized_path.rb b/lib/ancestry/materialized_path.rb
index 41eb84d3..d53854af 100644
--- a/lib/ancestry/materialized_path.rb
+++ b/lib/ancestry/materialized_path.rb
@@ -101,12 +101,7 @@ def child_ancestry_sql
     end
 
     def ancestry_depth_sql
-      @ancestry_depth_sql ||=
-        begin
-          tmp = %{(LENGTH(#{table_name}.#{ancestry_column}) - LENGTH(REPLACE(#{table_name}.#{ancestry_column},'#{ancestry_delimiter}','')))}
-          tmp = tmp + "/#{ancestry_delimiter.size}" if ancestry_delimiter.size > 1
-          "(CASE WHEN #{table_name}.#{ancestry_column} IS NULL THEN 0 ELSE 1 + #{tmp} END)"
-        end
+      @ancestry_depth_sql ||= MaterializedPath.construct_depth_sql(table_name, ancestry_column, ancestry_delimiter)
     end
 
     def generate_ancestry(ancestor_ids)
@@ -135,6 +130,12 @@ def concat(*args)
       end
     end
 
+    def self.construct_depth_sql(table_name, ancestry_column, ancestry_delimiter)
+      tmp = %{(LENGTH(#{table_name}.#{ancestry_column}) - LENGTH(REPLACE(#{table_name}.#{ancestry_column},'#{ancestry_delimiter}','')))}
+      tmp = tmp + "/#{ancestry_delimiter.size}" if ancestry_delimiter.size > 1
+      "(CASE WHEN #{table_name}.#{ancestry_column} IS NULL THEN 0 ELSE 1 + #{tmp} END)"
+    end
+
     private
 
     def ancestry_validation_options(ancestry_primary_key_format)
diff --git a/lib/ancestry/materialized_path2.rb b/lib/ancestry/materialized_path2.rb
index 47d520f8..46887852 100644
--- a/lib/ancestry/materialized_path2.rb
+++ b/lib/ancestry/materialized_path2.rb
@@ -33,12 +33,7 @@ def child_ancestry_sql
     end
 
     def ancestry_depth_sql
-      @ancestry_depth_sql ||=
-        begin
-          tmp = %{(LENGTH(#{table_name}.#{ancestry_column}) - LENGTH(REPLACE(#{table_name}.#{ancestry_column},'#{ancestry_delimiter}','')))}
-          tmp = tmp + "/#{ancestry_delimiter.size}" if ancestry_delimiter.size > 1
-          "(#{tmp} -1)"
-        end
+      @ancestry_depth_sql ||= MaterializedPath2.construct_depth_sql(table_name, ancestry_column, ancestry_delimiter)
     end
 
     def generate_ancestry(ancestor_ids)
@@ -49,6 +44,13 @@ def generate_ancestry(ancestor_ids)
       end
     end
 
+    # module method
+    def self.construct_depth_sql(table_name, ancestry_column, ancestry_delimiter)
+      tmp = %{(LENGTH(#{table_name}.#{ancestry_column}) - LENGTH(REPLACE(#{table_name}.#{ancestry_column},'#{ancestry_delimiter}','')))}
+      tmp = tmp + "/#{ancestry_delimiter.size}" if ancestry_delimiter.size > 1
+      "(#{tmp} -1)"
+    end
+
     private
 
     def ancestry_nil_allowed?
diff --git a/test/concerns/db_test.rb b/test/concerns/db_test.rb
index eb794056..fe2001c8 100644
--- a/test/concerns/db_test.rb
+++ b/test/concerns/db_test.rb
@@ -3,6 +3,8 @@
 class DbTest < ActiveSupport::TestCase
   def test_does_not_load_database
     c = Class.new(ActiveRecord::Base) do
+      self.table_name = "table"
+
       def self.connection
         raise "Oh No - tried to connect to database"
       end