discourse/plugins/poll/lib/polls_updater.rb

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module DiscoursePoll
class PollsUpdater
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VALID_POLLS_CONFIGS = %w{type min max public}.map(&:freeze)
def self.update(post, polls)
# load previous polls
previous_polls = post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD] || {}
# extract options
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current_option_ids = extract_option_ids(polls)
previous_option_ids = extract_option_ids(previous_polls)
# are the polls different?
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if polls_updated?(polls, previous_polls) || (current_option_ids != previous_option_ids)
has_votes = total_votes(previous_polls) > 0
# outside of the 5-minute edit window?
if post.created_at < 5.minutes.ago && has_votes
# cannot add/remove/rename polls
if polls.keys.sort != previous_polls.keys.sort
post.errors.add(:base, I18n.t("poll.cannot_change_polls_after_5_minutes"))
return
end
# deal with option changes
if User.staff.pluck(:id).include?(post.last_editor_id)
# staff can only edit options
polls.each_key do |poll_name|
if polls[poll_name]["options"].size != previous_polls[poll_name]["options"].size && previous_polls[poll_name]["voters"].to_i > 0
post.errors.add(:base, I18n.t("poll.staff_cannot_add_or_remove_options_after_5_minutes"))
return
end
end
else
# OP cannot edit poll options
post.errors.add(:base, I18n.t("poll.op_cannot_edit_options_after_5_minutes"))
return
end
end
# try to merge votes
polls.each_key do |poll_name|
next unless previous_polls.has_key?(poll_name)
return if has_votes && private_to_public_poll?(post, previous_polls, polls, poll_name)
# when the # of options has changed, reset all the votes
if polls[poll_name]["options"].size != previous_polls[poll_name]["options"].size
PostCustomField.where(post_id: post.id, name: DiscoursePoll::VOTES_CUSTOM_FIELD).destroy_all
post.clear_custom_fields
next
end
polls[poll_name]["voters"] = previous_polls[poll_name]["voters"]
polls[poll_name]["anonymous_voters"] = previous_polls[poll_name]["anonymous_voters"] if previous_polls[poll_name].has_key?("anonymous_voters")
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previous_options = previous_polls[poll_name]["options"]
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public_poll = polls[poll_name]["public"] == "true"
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polls[poll_name]["options"].each_with_index do |option, index|
previous_option = previous_options[index]
option["votes"] = previous_option["votes"]
option["anonymous_votes"] = previous_option["anonymous_votes"] if previous_option.has_key?("anonymous_votes")
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if public_poll && previous_option.has_key?("voter_ids")
option["voter_ids"] = previous_option["voter_ids"]
end
end
end
# immediately store the polls
post.custom_fields[DiscoursePoll::POLLS_CUSTOM_FIELD] = polls
post.save_custom_fields(true)
# publish the changes
MessageBus.publish("/polls/#{post.topic_id}", { post_id: post.id, polls: polls })
end
end
def self.polls_updated?(current_polls, previous_polls)
return true if (current_polls.keys.sort != previous_polls.keys.sort)
current_polls.each_key do |poll_name|
if !previous_polls[poll_name] ||
(current_polls[poll_name].values_at(*VALID_POLLS_CONFIGS) != previous_polls[poll_name].values_at(*VALID_POLLS_CONFIGS))
return true
end
end
false
end
def self.extract_option_ids(polls)
polls.values.map { |p| p["options"].map { |o| o["id"] } }.flatten.sort
end
def self.total_votes(polls)
polls.map { |key, value| value["voters"].to_i }.sum
end
private
def self.private_to_public_poll?(post, previous_polls, current_polls, poll_name)
previous_poll = previous_polls[poll_name]
current_poll = current_polls[poll_name]
if previous_polls["public"].nil? && current_poll["public"] == "true"
error =
if poll_name == DiscoursePoll::DEFAULT_POLL_NAME
I18n.t("poll.default_cannot_be_made_public")
else
I18n.t("poll.named_cannot_be_made_public", name: poll_name)
end
post.errors.add(:base, error)
return true
end
false
end
end
end