/usr/lib/ruby/vendor_ruby/sequel/plugins/update_primary_key.rb is in ruby-sequel 4.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Plugins
# The update_primary_key plugin allows you to modify an object's
# primary key and then save the record. Sequel does not work
# correctly with primary key modifications by default. Sequel
# is designed to work with surrogate primary keys that never need to be
# modified, but this plugin makes it work correctly with natural
# primary keys that may need to be modified. Example:
#
# album = Album[1]
# album.id = 2
# album.save
#
# Usage:
#
# # Make all model subclasses support primary key updates
# # (called before loading subclasses)
# Sequel::Model.plugin :update_primary_key
#
# # Make the Album class support primary key updates
# Album.plugin :update_primary_key
module UpdatePrimaryKey
module InstanceMethods
# Clear the cached primary key.
def after_update
super
@pk_hash = nil
end
# Use the cached primary key if one is present.
def pk_hash
@pk_hash || super
end
private
# If the primary key column changes, clear related associations and cache
# the previous primary key values.
def change_column_value(column, value)
pk = primary_key
if (pk.is_a?(Array) ? pk.include?(column) : pk == column)
@pk_hash ||= pk_hash unless new?
clear_associations_using_primary_key
end
super
end
# Clear associations that are likely to be tied to the primary key.
# Note that this currently can clear additional options that don't reference
# the primary key (such as one_to_many columns referencing a column other than the
# primary key).
def clear_associations_using_primary_key
associations.keys.each do |k|
associations.delete(k) if model.association_reflection(k)[:type] != :many_to_one
end
end
# Do not use prepared statements for update queries, since they don't work
# in the case where the primary key has changed.
def use_prepared_statements_for?(type)
if type == :update
false
else
super
end
end
end
end
end
end
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