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Support PostgreSQL 10 pg_sequence #28864

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May 30, 2017
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Support PostgreSQL 10 pg_sequence #28864

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10 changes: 9 additions & 1 deletion activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -290,9 +290,17 @@ def reset_pk_sequence!(table, pk = nil, sequence = nil) #:nodoc:

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
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