Rails - Mar 2013 - validates presence of foreign key fails in nested form

I''m using accepts_nested_attributes as follows:

class Timesheet < ActiveRecord::Base
  attr_accessible :status, :user_id, :start_date, :end_date, 
:activities_attributes
  has_many :activities, dependent: :destroy
  has_many :time_entries, through: :activities
  accepts_nested_attributes_for :activities, allow_destroy: true
end

class Activity < ActiveRecord::Base
  attr_accessible :task_id, :timesheet_id, :time_entries_attributes
  validates :task_id, presence: true, uniqueness: { scope:
''timesheet_id''}
  belongs_to :timesheet
  belongs_to :task
  has_many :time_entries, order: :workdate, dependent: :destroy

  accepts_nested_attributes_for :time_entries, allow_destroy: true, 
reject_if: proc { |a| a[:worktime].blank? }
end

As you see, I didn''t define any validation for timesheet_id presence in
Activity model. It works fine in the browser, but it is still possible to 
create an activity without timesheet_id assigned.

If I add:

validates :timesheet_id, presence: true

to the Activity model, I can''t any more create a timesheet via browser.
Any
idea ?
Regards

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Found the way to do that by using ''inverse_of'' option (see
below):

On 25 Mar 2013, at 16:03, Javix
<s.cambour-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I''m using accepts_nested_attributes as follows:
> 
> class Timesheet < ActiveRecord::Base
>   attr_accessible :status, :user_id, :start_date, :end_date,
:activities_attributes
>   has_many :activities, dependent: :destroy
>   has_many :time_entries, through: :activities, inverse_of: :timesheet
>   accepts_nested_attributes_for :activities, allow_destroy: true
> end
> 
> class Activity < ActiveRecord::Base
>   attr_accessible :task_id, :timesheet_id, :time_entries_attributes
>   validates :task_id, presence: true, uniqueness: { scope:
''timesheet_id''}
>   belongs_to :timesheet, inverse_of: :activities
>   belongs_to :task
>   has_many :time_entries, order: :workdate, dependent: :destroy,
inverse_of: :activity
> 
>   accepts_nested_attributes_for :time_entries, allow_destroy: true,
reject_if: proc { |a| a[:worktime].blank? }
> end
> 
> As you see, I didn''t define any validation for timesheet_id
presence in Activity model. It works fine in the browser, but it is still
possible to create an activity without timesheet_id assigned.
> 
> If I add:
> 
> validates :timesheet_id, presence: true
> 
> to the Activity model, I can''t any more create a timesheet via
browser. Any idea ?
> Regards
> 
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>  
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