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andrewdmason-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Apr-24 16:13 UTC

Creating a "friends" association?

Hi, I have a Friend model that looks like this:

  create_table "friendships", :force => true do |t|
    t.column "sent_by_user_id",     :integer
    t.column "received_by_user_id", :integer
    t.column "status",              :boolean
  end


I would like to be able to define a :friends association in my user
model that returns friendships that are both sent_by and received_by a
given user.  Any way to do this?

I''ve been told that traditionally you just create two friendship
records to handle this, but it seems like a cumbersome solution.

Thanks,

Andrew


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mixplate

2007-Apr-24 18:01 UTC

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Re: Creating a "friends" association?

check out plugin acts as friends at agileweb.


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Xavier Noria

2007-Apr-24 18:32 UTC

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Re: Creating a "friends" association?

On Apr 24, 2007, at 6:13 PM,
andrewdmason-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> Hi, I have a Friend model that looks like this:
>
>   create_table "friendships", :force => true do |t|
>     t.column "sent_by_user_id",     :integer
>     t.column "received_by_user_id", :integer
>     t.column "status",              :boolean
>   end
>
>
> I would like to be able to define a :friends association in my user
> model that returns friendships that are both sent_by and received_by a
> given user.  Any way to do this?
>
> I''ve been told that traditionally you just create two friendship
> records to handle this, but it seems like a cumbersome solution.
That''s the canonical solution if it''s OK for the amount of
data,
otherwise you need to emulate symmetry by hand:

   sender.friends
   receiver.friends

should contain each other and the nice way to do that is to delegate  
in AR. That symmetry is then maintained by callbacks on the join model.

Additionally, you normally want to apply transitive somehow and the  
SQL is easier if you have a "direction" to follow, I wrote a little  
about this here:

   http://www.advogato.org/article/914.html

-- fxn


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Xavier Noria

2007-Apr-24 21:36 UTC

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Re: Creating a "friends" association?

[I sent this a few hours ago but have not receive it back, please  
excuse if you got it twice.]

On Apr 24, 2007, at 6:13 PM,
andrewdmason-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
> Hi, I have a Friend model that looks like this:
>
>   create_table "friendships", :force => true do |t|
>     t.column "sent_by_user_id",     :integer
>     t.column "received_by_user_id", :integer
>     t.column "status",              :boolean
>   end
>
>
> I would like to be able to define a :friends association in my user
> model that returns friendships that are both sent_by and received_by a
> given user.  Any way to do this?
>
> I''ve been told that traditionally you just create two friendship
> records to handle this, but it seems like a cumbersome solution.
That''s the canonical solution if it''s OK for the amount of
data,
otherwise you need to emulate symmetry by hand:

   sender.friends
   receiver.friends

should contain each other and the nice way to do that is to delegate  
in AR. That symmetry is then maintained by callbacks on the join model.

Additionally, you normally want to apply transitive somehow and the  
SQL is easier if you have a "direction" to follow, I wrote a little  
about this here:

   http://www.advogato.org/article/914.html

-- fxn



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andrewdmason-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Apr-25 20:19 UTC

head link

Creating a "friends" association?

Hi,

I''m trying to make a friendships table that looks like this:

  create_table "friendships", :force => true do |t|
    t.column "sent_by_user_id",     :integer
    t.column "received_by_user_id", :integer
    t.column "status",              :boolean
  end

Where there is 1 record for each friendship, and User.friends returns
all friendships through :sent_by user and :received_by user.

Creating a User.friends model method is no trouble, but I''d like to
make a :friends association to preserve the association magic.

Is there a way to write an association that will return both sets
sent_by and received_by?

Thanks!

Andrew


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andrewdmason-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-Apr-25 20:20 UTC

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Re: Creating a "friends" association?

sorry, disregard my last message.  Problems with google groups...


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Rails - Apr 2007 - Creating a "friends" association?

Creating a "friends" association?

Re: Creating a "friends" association?

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Re: Creating a "friends" association?

Creating a "friends" association?

Re: Creating a "friends" association?