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