ruby on rails - How do I use the Impressionist gem? -

i'm using impressionist gem.

i want display hit counter of 1 particular page, in same view.

this did:

1. install gem.
2. run generator.
3. add column counter_cache migration.
4. run rake db:migrate.
5. add impressionist :actions=>[:show] controller want track impressions from.
6. add is_impressionable :counter_cache => true model pertaining controller above.
7. restart server.

i have 2 questions:

1. why doesn't counter_cache number increased each impression (and each respective record)?
2. is there method can use in view display hit count, or should craft own query?

there method show how hits:

<%= @model_instance.impressionist_count %> views 

put in view.