Why through and foreign_key not working?

I need SQL :

SELECT `activities`.* FROM `activities` INNER JOIN `friendships` ON
`activities`.user_id = `friendships`.friend_id WHERE
`friendships`.user_id = 1

My User Model code:

has_many :friendships, :dependent => :destroy
has_many :friends, :through => :friendships
has_many :activities

I need SQL :

SELECT `activities`.* FROM `activities` INNER JOIN `friendships` ON
`activities`.user_id = `friendships`.friend_id WHERE
`friendships`.user_id = 1

My User Model code:

has_many :friendships, :dependent => :destroy
has_many :friends, :through => :friendships
has_many :activities
##############################
has_many :friends_activities, :foreign_key => :user_id, :class_name =>
'Activity', :through => :friendships, :source => :friend

Rails3 return:

ON `activities`.id = `friendships`.friend_id ??! :foreign_key is
ignored

Why ?!!!!

With has many through you use the :source option to tell it which of
the associations of friendships to follow to get to the desired row(s)

Fred

Frederick Cheung wrote:

With has many through you use the :source option to tell it which of
the associations of friendships to follow to get to the desired row(s)

Fred

Now~ I need `activities`.user_id not is `activities`.id :smiley:

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Jimmy Zhang wrote:

VTD-XML 2.9, the next generation XML Processing API for SOA and Cloud
computing, has been released.

[...]

Please don't hijack threads. And this is off topic anyway.

Best,

Frederick Cheung wrote:
> With has many through you use the :source option to tell it which of
> the associations of friendships to follow to get to the desired row(s)

> Fred

Now~ I need `activities`.user_id not is `activities`.id :smiley:

Then you need to change the source association to point at what you
want (i think belongs_to has a primary_key option these days)

Fred