discourse/db/migrate/20140530002535_remove_syste...

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# This takes all the system avatars out of the upload system, saving us a huge
# amount of space on backups
class RemoveSystemAvatarsFromUserAvatars < ActiveRecord::Migration
def up
execute "UPDATE users SET uploaded_avatar_id = NULL WHERE uploaded_avatar_id IN (
SELECT system_upload_id FROM user_avatars
)"
# normally we dont reach into the object model, but we have to here.
# otherwise we will wait a real long time for uploads to go away
skip = -1
while skip=destroy_system_avatar_batch(skip) do
puts "Destroyed up to id: #{skip}"
end
remove_column :user_avatars, :system_upload_id
remove_column :user_avatars, :system_avatar_version
end
def destroy_system_avatar_batch(skip)
initial = skip
Upload.where('id IN (SELECT system_upload_id FROM user_avatars) AND id > ?', skip)
.order(:id)
.limit(500)
.each do |upload|
skip = upload.id
begin
upload.destroy
rescue
Rails.logger.warn "Could not destroy system avatar #{upload.id}"
end
end
skip == initial ? nil : skip
rescue
Rails.logger.warn "Could not destroy system avatars, skipping"
nil
end
def down
raise ActiveRecord::IrreversibleMigration
end
end