sql - total of ratings when using letsrate gem -


i'm using letsrate gem (https://github.com/muratguzel/letsrate) allows users rate different attributes (called 'dimensions') of model (for eg "car" model can rated on "price" & "speed"). user allowed re-rate dimensions.

i display total sum value of ratings ie latest value of "price" plus latest value of "speed". total gets refreshed automatically every time user re-rates of dimensions.

after trial & error tried following helper method:

@rate_dimension_1 =rate.find_by_rater_id_and_rateable_id_and_dimension(@user.id, @object.id, "speed").stars @rate_dimension_2 = rate.find_by_rater_id_and_rateable_id_and_dimension(@user.id, @object.id, "price").stars total_rating = @rate_dimension_1 + @rate_dimension_2

but feel inefficient may want increase number of dimensions & sure slow way calculate when there many records. store total in db gets updated when of ratings changed.

what best way this?

i thinking add column rate db stores sum of dimensions. appreciate code summing latest values of dimensions per user per model id, storing & displaying via ajax?

first off, think better way going calculating total rating manually single query, rather 2 queries:

total_rating = rate.sum(:stars,    conditions: {rater_id: @user.id, rateable_id: @object.id, dimension: %w(speed price)})

if want on all dimensions, can remove dimension condition:

total_rating = rate.sum(:stars,    conditions: {rater_id: @user.id, rateable_id: @object.id})

this leave single query db regardless of number of dimensions.


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