Flatten sp_helpconstraint when looking for constraints just in case fks are present. Issue #64.

Author: metaskills

CHANGELOG

@@ -1,6 +1,8 @@
 
 * master *
 
+* Flatten sp_helpconstraint when looking for constraints just in case fks are present. Issue #64.
+
 * Start to support 2011 code named "Denali".
 
 * Limit and Offset can take SqlLiteral objects now.

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -241,8 +241,9 @@ def remove_check_constraints(table_name, column_name)
           end
         end
 
-        def remove_default_constraint(table_name, column_name)
-          select_all("EXEC sp_helpconstraint '#{quote_string(table_name)}','nomsg'").select do |row|
+        def remove_default_constraint(table_name, column_name))
+          # If their are foreign keys in this table, we could still get back a 2D array, so flatten just in case.
+          select_all("EXEC sp_helpconstraint '#{quote_string(table_name)}','nomsg'").flatten.select do |row|
             row['constraint_type'] == "DEFAULT on column #{column_name}"
           end.each do |row|
             do_execute "ALTER TABLE #{quote_table_name(table_name)} DROP CONSTRAINT #{row['constraint_name']}"