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Fix #5329 (#5332)

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This fixes #5329, which occurred when using MigrationHelpers on a
table that Postgres estimated to be non-empty when it was actually
empty.
This commit is contained in:
aschmitz 2017-10-11 14:20:39 -05:00 committed by Eugen Rochko
parent 75e036b493
commit 93e3eaf95d
1 changed files with 4 additions and 1 deletions
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5
lib/mastodon/migration_helpers.rb
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@ -335,7 +335,10 @@ module Mastodon
start_arel = table.project(table[:id]).order(table[:id].asc).take(1)
start_arel = yield table, start_arel if block_given?
start_id = exec_query(start_arel.to_sql).to_hash.first['id'].to_i
first_row = exec_query(start_arel.to_sql).to_hash.first
# In case there are no rows but we didn't catch it in the estimated size:
return unless first_row
start_id = first_row['id'].to_i
say "Migrating #{table_name}.#{column} (~#{total.to_i} rows)"