app/models/poll/answer.rb
class Poll::Answer < ApplicationRecord
belongs_to :question, -> { with_hidden }, inverse_of: :answers
belongs_to :option, class_name: "Poll::Question::Option"
belongs_to :author, -> { with_hidden }, class_name: "User", inverse_of: :poll_answers
delegate :poll, :poll_id, to: :question
validates :question, presence: true
validates :author, presence: true
validates :answer, presence: true
validates :option, uniqueness: { scope: :author_id }, allow_nil: true
validate :max_votes
validates :answer, inclusion: { in: ->(a) { a.question.possible_answers }},
unless: ->(a) { a.question.blank? }
scope :by_author, ->(author_id) { where(author_id: author_id) }
scope :by_question, ->(question_id) { where(question_id: question_id) }
def save_and_record_voter_participation
author.with_lock do
save!
Poll::Voter.find_or_create_by!(user: author, poll: poll, origin: "web")
end
end
def destroy_and_remove_voter_participation
transaction do
destroy!
if author.poll_answers.where(question_id: poll.question_ids).none?
Poll::Voter.find_by(user: author, poll: poll, origin: "web").destroy!
end
end
end
private
def max_votes
return if !question || !author || persisted?
author.with_lock do
if question.answers.by_author(author).count >= question.max_votes
errors.add(:answer, "Maximum number of votes per user exceeded")
end
end
end
end