Created
May 7, 2018 08:07
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backport_to_pg10.rb
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# frozen_string_literal: true | |
require "active_record/connection_adapters/postgresql/schema_statements" | |
# | |
# Monkey-patch the refused Rails 4.2 patch at https://github.com/rails/rails/pull/31330 | |
# | |
# Updates sequence logic to support PostgreSQL 10. | |
# | |
module ActiveRecord | |
module ConnectionAdapters | |
module PostgreSQL | |
module SchemaStatements | |
# Resets the sequence of a table's primary key to the maximum value. | |
def reset_pk_sequence!(table, pk = nil, sequence = nil) #:nodoc: | |
unless pk && sequence | |
default_pk, default_sequence = pk_and_sequence_for(table) | |
pk ||= default_pk | |
sequence ||= default_sequence | |
end | |
if @logger && pk && !sequence | |
@logger.warn "#{table} has primary key #{pk} with no default sequence" | |
end | |
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 >= 100_000 | |
minvalue = select_value( | |
"SELECT seqmin FROM pg_sequence WHERE seqrelid = #{quote(quoted_sequence)}::regclass" | |
) | |
else | |
minvalue = select_value("SELECT min_value FROM #{quoted_sequence}") | |
end | |
end | |
select_value <<-end_sql, "SCHEMA" | |
SELECT setval(#{quote(quoted_sequence)}, #{max_pk ? max_pk : minvalue}, #{max_pk ? true : false}) | |
end_sql | |
end | |
end | |
end | |
end | |
end | |
end |
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