21 lines
818 B
Ruby
21 lines
818 B
Ruby
class PopulateVisibleLastAuthoredAt < ActiveRecord::Migration
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def self.up
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execute <<-SQL
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UPDATE conversation_participants
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SET visible_last_authored_at = (
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SELECT MAX(created_at)
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FROM conversation_messages, conversation_message_participants
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WHERE conversation_messages.conversation_id = conversation_participants.conversation_id
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AND conversation_messages.author_id = conversation_participants.user_id
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AND conversation_message_participants.conversation_message_id = conversation_messages.id
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AND conversation_message_participants.conversation_participant_id = conversation_participants.id
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AND NOT generated
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)
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SQL
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end
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def self.down
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execute "UPDATE conversation_participants SET visible_last_authored_at = NULL"
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end
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end
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