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Merge pull request #28864 from yahonda/pg10_pg_sequences

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Support PostgreSQL 10 `pg_sequence`
This commit is contained in:
Matthew Draper 2017-05-31 03:12:27 +09:30 committed by GitHub
commit ac3c04513e
1 changed files with 9 additions and 1 deletions
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10
activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
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@ -290,9 +290,17 @@ module ActiveRecord
if pk && sequence
quoted_sequence = quote_table_name(sequence)
max_pk = select_value("select MAX(#{quote_column_name pk}) from #{quote_table_name(table)}")
if max_pk.nil?
if postgresql_version >= 100000
minvalue = select_value("SELECT seqmin from pg_sequence where seqrelid = '#{quoted_sequence}'::regclass")
else
minvalue = select_value("SELECT min_value FROM #{quoted_sequence}")
end
end
select_value(<<-end_sql, "SCHEMA")
SELECT setval('#{quoted_sequence}', (SELECT COALESCE(MAX(#{quote_column_name pk})+(SELECT increment_by FROM #{quoted_sequence}), (SELECT min_value FROM #{quoted_sequence})) FROM #{quote_table_name(table)}), false)
SELECT setval('#{quoted_sequence}', #{max_pk ? max_pk : minvalue}, #{max_pk ? true : false})
end_sql
end
end