discourse/app/models/draft_sequence.rb

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class DraftSequence < ActiveRecord::Base
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def self.next!(user, key)
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user_id = user
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user_id = user.id unless user.is_a?(Integer)
return 0 if user_id < 0
h = { user_id: user_id, draft_key: key }
c = DraftSequence.find_by(h)
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c ||= DraftSequence.new(h)
c.sequence ||= 0
c.sequence += 1
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c.save!
exec_sql("DELETE FROM drafts WHERE user_id = :user_id AND draft_key = :draft_key AND sequence < :sequence", draft_key: key, user_id: user_id, sequence: c.sequence)
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c.sequence
end
def self.current(user, key)
return nil unless user
user_id = user
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user_id = user.id unless user.is_a?(Integer)
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# perf critical path
r = exec_sql('select sequence from draft_sequences where user_id = ? and draft_key = ?', user_id, key).values
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r.length.zero? ? 0 : r[0][0]
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end
end
# == Schema Information
#
# Table name: draft_sequences
#
# id :integer not null, primary key
# user_id :integer not null
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# draft_key :string(255) not null
# sequence :integer not null
#
# Indexes
#
# index_draft_sequences_on_user_id_and_draft_key (user_id,draft_key) UNIQUE
#