Problems with tags_as_taggable

Hello

I need help from you all. I have 3 tables: tbl_restaurants, tbl_tags,
and tbl_res_tags. tbl_restaurants has 3 fields: res_id, name,
description. tbl_tags has tag_id and name. tbl_res_tags has tag_id and
res_id. So, tbl_restaurants has a Model “TblRestaurant”. tbl_tags has a
Model “TblTag”. tbl_res_tags has a Model “TblResTag”. So, I define:

class TblRestaurant < ActiveRecord::Base
set_primary_key :res_id
acts_as_taggable :tag_class_name => “TblTag”,
:join_class_name => “TblResTag”,
:join_table => “tbl_res_tags”,
:foreign_key => “res_id”,
:association_foreign_key => “tag_id”
end

class TblTag < ActiveRecord::Base
set_primary_key :tag_id
end

When I write:

res = TblRestaurant.find(1).tag(“AA BB CC”)

In tbl_res_tags, there are 3 records. But, the tag_id has “0” value and
res_id has “1” value.

So, what 's wrong with my code? Can anyone solve this problem?
Thanks

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