ruby on rails - How to use foreign key in model and form builder? -

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i have 2 models: user , location below:

class user < activerecord::base   attr_accessible :location, :password, :user_name, :password_confirmation    validates :location, :user_name, :presence => true   validates :password, :presence => true, :confirmation => true    has_one :location, :foreign_key => 'location'  end  class location < activerecord::base   attr_accessible :loc_id, :loc_name    belongs_to :user, :foreign_key => 'loc_id' end

you can see use custom foreign_key models. use form builder build user sign form, when submit data error occurs:

location(#2170327880) expected, got string

i use simple_form build form, related code is:

= f.input :location, :collection => location.all.collect {|c| [c.loc_name, c.loc_id]}

how can resolve problem? or must use default foreign_key location_id association?

thanks.

update:

when rename location field in user model loc_id , remove :foreign_key this:

class user < activerecord::base   attr_accessible :loc_id, :password, :user_name, :password_confirmation    validates :loc_id, :user_name, :presence => true   validates :password, :presence => true, :confirmation => true    has_one :location, :foreign_key => 'location'  end  class location < activerecord::base   attr_accessible :loc_id, :loc_name    belongs_to :user end

it works fine. still want know how associate user , location model.

p.s. use location model store country code , country name, never update user.

it sounds want have

class user < activerecord::base   belongs_to :location end  class location < activerecord::base   has_many :users end

this means user has location_id column. if things other way around (user_id column on location) given location can associated 1 user. rails way location_id on users 'points' @ id column in locations table. if want point @ different column, use :primary_key option (the :foreign_key option if wanted column on users called other location_id)

in terms of form, can't f.select :location - forms don't know how transfer complicated object that. in these cases want set form control location_id attribute, i.e. 

= f.input :location_id, :collection => location.all.collect {|c| [c.loc_name, c.id]}

if go down route of having location id column refer loc_id column on location, you'd need change be

= f.input :location_id, :collection => location.all.collect {|c| [c.loc_name, c.loc_id]}

personally if you're starting out rails i'd stick defaults


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