Question

Hi
I got a model Category and another model Products. The have the relationship – has_and_belongs_to_many.

When I open the console and type Category.first.products, I receive a list with the products attached to that Category.

But when I try to generate an xml file with the show model I get:

undefined method `type' for nil:NilClass

I’ve tested the code below on other models I’ve made that has_many relationships and it works like how I want it to work. But won’t work with this relationship, maybe it doesn’t have anything to with that?

  def show

@categories = Category.find(params[:id])

@products = @categories.products

respond_to do |format|
  format.html # index.html.erb
  format.xml { render :xml => @products }
  format.json { render :json => @products }
end

end

I’m new to this as you can see…

Answer 1

Thanks for your replies, I continued investigating and experimented with the controllers, and just tried with. @category.products.all, and it worked. The sad thing is that I don’t know why it did… Especially when it works for me in the console… But I guess I’m happy to have solved the problem in one way so to speak…

def show
@category = Category.find(params[:id])

@products = @category.products.all

respond_to do |format|
  format.html # show.html.erb
  format.xml { render :xml => @products }
end

end

But I will use the log and the terminal logger when I debug more than before! Thanks for the tips!