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require 'set'
require_relative '../../migration_helpers'
module RuboCop
module Cop
module Migration
# Cop that prevents the use of hash indexes in database migrations
class HashIndex < RuboCop::Cop::Cop
include MigrationHelpers
MSG = 'hash indexes should be avoided at all costs since they are not ' \
'recorded in the PostgreSQL WAL, you should use a btree index instead'.freeze
NAMES = Set.new([:add_index, :index, :add_concurrent_index]).freeze
def on_send(node)
return unless in_migration?(node)
name = node.children[1]
return unless NAMES.include?(name)
opts = node.children.last
return unless opts && opts.type == :hash
opts.each_node(:pair) do |pair|
next unless hash_key_type(pair) == :sym &&
hash_key_name(pair) == :using
if hash_key_value(pair).to_s == 'hash'
add_offense(pair, :expression)
end
end
end
def hash_key_type(pair)
pair.children[0].type
end
def hash_key_name(pair)
pair.children[0].children[0]
end
def hash_key_value(pair)
pair.children[1].children[0]
end
end
end
end
end
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