discourse/plugins/poll/db/migrate/20151016163051_merge_polls_...

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class MergePollsVotes < ActiveRecord::Migration[4.2]
def up
PostCustomField.where(name: "polls").order(:post_id).pluck(:post_id).each do |post_id|
polls_votes = {}
PostCustomField.where(post_id: post_id).where("name LIKE 'polls-votes-%'").find_each do |pcf|
user_id = pcf.name["polls-votes-".size..-1]
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polls_votes["#{user_id}"] = ::JSON.parse(pcf.value || "{}")
end
pcf = PostCustomField.find_or_create_by(name: "polls-votes", post_id: post_id)
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pcf.value = ::JSON.parse(pcf.value || "{}").merge(polls_votes).to_json
pcf.save
end
end
def down
end
end