ruby - how to count all page impressions from two different models into one number? (rails 3) -


i'm using impressionist gem , works well.

i using in user/show.html.erb view count impressions of person's profile (user.rb impressionable)

<%= @user.impressionist_count %>

i decided break out each micropost user , decided count (micropost.rb impressionable)

in micropost/show.html.erb - using code count how many times particular post viewed

<%= @micropost.impressionist_count %>

i trying sum of @micropost.impressionist_count fall under same user , add user/show.html.erb. how can that?

so in mathematical terms, i'm trying do

total = user.impressionist_count + sum(micropost.impressionist_count)s

you haven't specified database using gem. it's compatible rdbms database, mongodb. summing may perform differently depending on choice.

in rdbms-backed system, can eager load of related microposts given user through use of join (:joins in ar parlance). having grabbed of related microposts, can do:

@user.impressionist_count + @user.microposts.sum(&:impressionist_count)

rails gives enumerable#sum (http://api.rubyonrails.org/classes/enumerable.html#method-i-sum) can use that.

the difference can see, mongo concerned, amount of requests you're going make database unless you've embedded microposts each user document.

hope helps.


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