Found the way to do that by using 'inverse_of' option (see below):
On 25 Mar 2013, at 16:03, Javix <s.camb...@gmail.com> 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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