19 lines
545 B
Ruby
19 lines
545 B
Ruby
class CleanupInvalidPolls < ActiveRecord::Migration[5.1]
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class Poll < ApplicationRecord
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has_many :poll_answers, dependent: :destroy
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has_many :poll_participations, dependent: :destroy
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end
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class PollAnswer < ApplicationRecord
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belongs_to :poll
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has_many :poll_participations
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end
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class PollParticipation < ApplicationRecord
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belongs_to :poll
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belongs_to :poll_answer
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end
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def up
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Poll.joins("LEFT OUTER JOIN posts ON posts.id = polls.status_message_id")
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.where("posts.id IS NULL").destroy_all
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end
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end
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