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Optimization for postgres adapter for add_column method. Set default and not null in one query

This commit is contained in:
Timothy N. Tsvetkov 2011-02-12 21:41:03 +03:00 committed by Aaron Patterson
parent f83218561e
commit 09ccdc3737
1 changed files with 10 additions and 6 deletions
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16
activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
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@ -845,14 +845,18 @@ module ActiveRecord
# Adds a new column to the named table.
# See TableDefinition#column for details of the options you can use.
def add_column(table_name, column_name, type, options = {})
default = options[:default]
notnull = options[:null] == false
add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
add_column_options!(add_column_sql, options)
# Add the column.
execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}")
begin
execute add_column_sql
rescue ActiveRecord::StatementInvalid => e
raise e if postgresql_version > 80000
change_column_default(table_name, column_name, default) if options_include_default?(options)
change_column_null(table_name, column_name, false, default) if notnull
execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}")
change_column_default(table_name, column_name, options[:default]) if options_include_default?(options)
change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null)
end
end
# Changes the column of a table.