Ruby on Rails

Hi
I have a message model and message_participants table.
message_participants table because same message goes to various
recipients.
Messaging between either company to users OR user to company. So an
initial design of tables made like

messages table
-----------

+-------------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| subject | varchar(255) | YES | | NULL | |
| message_thread_id | int(11) | YES | | NULL | |
| message | text | YES | | NULL | |
| company_id | int(11) | YES | | NULL | |
+-------------------+--------------+------+-----+---------+----------------+

message_participants table
----------------------------

+---------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| direction_in | tinyint(1) | YES | | NULL | |
| direction_out | tinyint(1) | YES | | NULL | |
| type | varchar(255) | YES | | NULL | |
| company_id | int(11) | YES | | NULL | |
| user_id | int(11) | YES | | NULL | |
| message_id | int(11) | YES | | NULL | |
+---------------+--------------+------+-----+---------+----------------+

Here about 'type' field I am not sure. My question is should I treat
message_participants like STI or polymorphic? I can't decide it.

Relation is

message has_many message_participants
message_participants belongs_to message

Please guide
Thanks
Tom
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