educoder/db/migrate/20200106092135_modify_viewe...

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296 B

class ModifyViewedCountForSubjects < ActiveRecord::Migration[5.2]
def change
subjects = Subject.where(status: 2).includes(:shixuns)
subjects.find_each do |subject|
subject.update_attribute(:visits, subject.visits + subject.shixuns.pluck(:myshixuns_count).sum)
end
end
end