On 25 February 2011 19:28, John Merlino <li...@ruby-forum.com> wrote:
> post.blog_images.first.image_file_name
>
> outputs
>
> undefined method `image_file_name' for nil:NilClass

That means that in your chain of method calls, the thing before
"image_file_name" is nil. So there is no "first" record in the
blog_images collection... are you sure you have some associated
images?

I tend to find using a "guard" helps in chained calls like this:
  post.blog_images.first.image_file_name if post.blog_images.first

or even (when necessary)
  foo.bar.baz.method_name if foo.bar && foo.bar.baz

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