Rails: impressionist_count on a relationship table -

i'm trying use impressionist gem track visits on relation. write method works well:

@document.publications.each |publication|   impressionist(publication) end

i have has_many, :through relation (simplified here works fine):

class document   has_many :components, :through => :publications end

i'm running issue writing query relevant impressions based on component. failing code presently looks this:

<% document.components.each |component| %>   <%= component.publications.where(:document_id => document.id).impressionist_count %> <% end %>

i no method error so:

undefined method 'impressionist_count' #<activerecord::relation:blah

i know i'm writing failing code incorrectly i'm struggling find correct way write it.

you need set-up :counter_cache in association

IO