Hi, I have following db schema: Seminars (id, ...) has_many :seminars_presentations has_many presentations, :through => seminar_presentations Presentations (id, ...) has_many :seminar_presentations has_many :seminars, :through => seminar_presentations seminars_presentations (seminar_id, presentation_id,......) belongs_to :presentation belongs_to :seminar Now, I would like to implement as below: Assumption: Presentations & Seminars tables has few records. I need to show the proposed (future) Seminar dates as links. To register an exisintg presentation to the seminar, the user clicks on a future date link. Then already registered presentations for that (just selected) seminar should be displayed and there should be option to add one more presentation to it. Once the user selectes a new presentation to register and clicks the "Register Presentation" link, that presentation should get registered with the seminar (from seminar date we can reach the seminar_id and use it to register). I have used Query string to get the proposed (future) Seminar date and then that date I use it to display on the view. Now, my problem is when I try to add a presentation to the seminar, rails gives error nil.date. So, now I cannot register the presentation to the seminar. Please help me. Thanks. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---