1 files changed, 11 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
index 507c3a62b0..158468fe5b 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/cidr.rb
@@ -7,6 +7,17 @@ module ActiveRecord
             :cidr
           end
 
+          def type_cast_for_schema(value)
+            subnet_mask = value.instance_variable_get(:@mask_addr)
+
+            # If the subnet mask is equal to /32, don't output it
+            if subnet_mask == (2**32 - 1)
+              "\"#{value.to_s}\""
+            else
+              "\"#{value.to_s}/#{subnet_mask.to_s(2).count('1')}\""
+            end
+          end
+
           def cast_value(value)
             ConnectionAdapters::PostgreSQLColumn.string_to_cidr value
           end