ruby - getting an undefined method error from "_user.html.erb" in Rails 3 -


if getting error

undefined method impressionist_count' nil:nilclass after trying use line inside _user.html.erb

<%= @user.impressionist_count+@user.microposts.sum(&:impressionist_count) %>

where need defined? have inside user.rb

def impressionist_count     impressions.size   end

i tried in various helpers no avail

when "render @users" each user accessible partial local variable "user". partial should like:

<%= user.impressionist_count+user.microposts.sum(&:impressionist_count) %>

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