ruby on rails - undefined method "arel_table" for Images:Module? -

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I have the user: the following docs through the union.

I have 3 models

posted 

  class posts

image 

  class image & lt; ActiveRecord :: Base has_many: image_posts has_many: Post, via = & gt; : Image_posts end

and ImagePost 

  class ImagePost & lt; ActiveRecord :: Base is_to: images is_to: posts end

and when I try: 

  post = post.last post.images

I get "undefined method" for arel_table "for images: module" error .

What is arel_table and how to fix this mistake? Thank you.

There is a problem defining the relationship between SAP and it should always be singular 

  class ImagePost & lt; ActiveRecord :: Base is_to: image is_to: post end

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