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# frozen_string_literal: true
module ActiveRecord
module ConnectionAdapters
# PostgreSQL-specific extensions to column definitions in a table.
class PostgreSQLColumn < Column #:nodoc:
delegate :array, :oid, :fmod, to: :sql_type_metadata
alias :array? :array
def initialize(*, max_identifier_length: 63, **)
super
@max_identifier_length = max_identifier_length
end
def serial?
return unless default_function
if %r{\Anextval\('"?(?<sequence_name>.+_(?<suffix>seq\d*))"?'::regclass\)\z} =~ default_function
sequence_name_from_parts(table_name, name, suffix) == sequence_name
end
end
private
attr_reader :max_identifier_length
def sequence_name_from_parts(table_name, column_name, suffix)
over_length = [table_name, column_name, suffix].map(&:length).sum + 2 - max_identifier_length
if over_length > 0
column_name_length = [(max_identifier_length - suffix.length - 2) / 2, column_name.length].min
over_length -= column_name.length - column_name_length
column_name = column_name[0, column_name_length - [over_length, 0].min]
end
if over_length > 0
table_name = table_name[0, table_name.length - over_length]
end
"#{table_name}_#{column_name}_#{suffix}"
end
end
end
end
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