[Rails] Re: group_by user_id

you can use any function in group_by clause, for example you can write
something like

your_record_collection.group_by{|zz|
function_returning_found_times}.each do |count_of_times, sub_collection|

next if count_of_times<SOME_VALUE #
user_ids = sub_collection.collect(&:user_id).join(',')
users_cnt = sub_collection.size

...etc

end

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