I've read AWDR and especially the part concerning adding child line_items to an order. Unfortunately I want to do my process in reverse and in doing what I thought would work I get a null object error when trying to append the children to the parent. This is a _major_ stumbling block in my Rails use as almost every one of my projects has needed this so its a pretty vital problem I need to overcome. My two tables: Reviews -< Pictures (Parent) -< (Child) I have a form where you first add a Review and after clicking an Ajax link it produces a sub-form ready for inputting the child pictures. However, no matter whether I want just one child or a group of children on the form I can't seem to get the Child objects to '<<' (append) to the parent object. In the book you collect your cart of 'children' (line_items) then append these after creating an order. My code is (in this instance I try it with just a single child): @picture = Picture.new(params[:picture]) @review = Review.new(params[:review]) @review.pictures << @picture.pictures I'm totally at a loss and I'm on hands and knees. Please please help me. I want to go far with Rails and this is killing me. Thank you for reading.
on 2006-02-09 01:15
on 2006-02-09 01:37
If I understand your problem correctly (and I'm not sure that I do, so please excuse me if that's the case), you shouldn't need to be appending your 'children' to the parent in that fashion. Try instead doing something like @review = Review.new(params[:review]) @review.save @picture = Picture.new(params[:picture]) @picture.review_id = @review.id @picture.save That will give you a new 'review' record, plus a new 'picture' record with the review_id field in the 'picture' record pointing to the 'review' record. There may be a more elegant way of achieving the same thing, but hopefully this is clear enough and addresses the issue you're seeing. Regards Dave M.