Rails - Jul 2005 - Ignoring duplicate records in HABTM relationship

What is the approach people are using to ignore duplicate records in
their habtm relationships?  I have seen the :uniq option, but this
just forces uniquness on the query, it still allows you to add the
same record to the collection multiple times.  What are people doing
so that the following code won''t result in two rows in your db:

class User < AR
end

class Group < AR
  habtm :users, :uniq => true
end.

group1.users << user1
group1.users << user1

asert_equal 1, group.users.size

Test failed:  Expected 1 but was 2


Personally I would have expected the :uniq option to enforce this
behavior but I am obviously missing something.

Josh

Compound primary keys in your rel table.


On Jul 14, 2005, at 5:12 PM, Josh Knowles wrote:
> What is the approach people are using to ignore duplicate records in
> their habtm relationships?  I have seen the :uniq option, but this
> just forces uniquness on the query, it still allows you to add the
> same record to the collection multiple times.  What are people doing
> so that the following code won''t result in two rows in your db:
>
> class User < AR
> end
>
> class Group < AR
>   habtm :users, :uniq => true
> end.
>
> group1.users << user1
> group1.users << user1
>
> asert_equal 1, group.users.size
>
> Test failed:  Expected 1 but was 2
>
>
> Personally I would have expected the :uniq option to enforce this
> behavior but I am obviously missing something.
>
> Josh
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