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require_relative '../../migration_helpers'
module RuboCop
module Cop
module Migration
# This cop requires a default value and disallows nulls for boolean
# columns on small tables.
#
# In general, this prevents 3-state-booleans.
# https://robots.thoughtbot.com/avoid-the-threestate-boolean-problem
#
# In particular, for the `application_settings` table, this ensures that
# upgraded installations get a proper default for the new boolean setting.
# A developer might otherwise mistakenly assume that a value in
# `ApplicationSetting.defaults` is sufficient.
#
# See https://gitlab.com/gitlab-org/gitlab-ee/issues/2750 for more
# information.
class SaferBooleanColumn < RuboCop::Cop::Cop
include MigrationHelpers
DEFAULT_OFFENSE = 'Boolean columns on the `%s` table should have a default. You may wish to use `add_column_with_default`.'.freeze
NULL_OFFENSE = 'Boolean columns on the `%s` table should disallow nulls.'.freeze
DEFAULT_AND_NULL_OFFENSE = 'Boolean columns on the `%s` table should have a default and should disallow nulls. You may wish to use `add_column_with_default`.'.freeze
SMALL_TABLES = %i[
application_settings
].freeze
def_node_matcher :add_column?, <<~PATTERN
(send nil :add_column $...)
PATTERN
def on_send(node)
return unless in_migration?(node)
matched = add_column?(node)
return unless matched
table, _, type = matched.to_a.take(3).map(&:children).map(&:first)
opts = matched[3]
return unless SMALL_TABLES.include?(table) && type == :boolean
no_default = no_default?(opts)
nulls_allowed = nulls_allowed?(opts)
offense = if no_default && nulls_allowed
DEFAULT_AND_NULL_OFFENSE
elsif no_default
DEFAULT_OFFENSE
elsif nulls_allowed
NULL_OFFENSE
end
add_offense(node, :expression, format(offense, table)) if offense
end
def no_default?(opts)
return true unless opts
each_hash_node_pair(opts) do |key, value|
return value == 'nil' if key == :default
end
end
def nulls_allowed?(opts)
return true unless opts
each_hash_node_pair(opts) do |key, value|
return value != 'false' if key == :null
end
end
def each_hash_node_pair(hash_node, &block)
hash_node.each_node(:pair) do |pair|
key = hash_pair_key(pair)
value = hash_pair_value(pair)
yield(key, value)
end
end
def hash_pair_key(pair)
pair.children[0].children[0]
end
def hash_pair_value(pair)
pair.children[1].source
end
end
end
end
end
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