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# frozen_string_literal: true
require_relative '../../migration_helpers'
module RuboCop
module Cop
module Migration
class ReferToIndexByName < RuboCop::Cop::Base
include MigrationHelpers
MSG = 'migration methods that refer to existing indexes must do so by name'
def_node_matcher :match_index_exists, <<~PATTERN
(send _ :index_exists? _ _ (hash $...) ?)
PATTERN
def_node_matcher :match_remove_index, <<~PATTERN
(send _ :remove_index _ $_)
PATTERN
def_node_matcher :match_remove_concurrent_index, <<~PATTERN
(send _ :remove_concurrent_index _ _ (hash $...) ?)
PATTERN
def_node_matcher :name_option?, <<~PATTERN
(pair {(sym :name) (str "name")} _)
PATTERN
def on_def(node)
return unless in_migration?(node)
node.each_descendant(:send) do |send_node|
next unless index_exists_offense?(send_node) || removing_index_offense?(send_node)
add_offense(send_node.loc.selector)
end
end
private
def index_exists_offense?(send_node)
match_index_exists(send_node) { |option_nodes| needs_name_option?(option_nodes) }
end
def removing_index_offense?(send_node)
remove_index_offense?(send_node) || remove_concurrent_index_offense?(send_node)
end
def remove_index_offense?(send_node)
match_remove_index(send_node) do |column_or_options_node|
break true unless column_or_options_node.type == :hash
column_or_options_node.children.none? { |pair| name_option?(pair) }
end
end
def remove_concurrent_index_offense?(send_node)
match_remove_concurrent_index(send_node) { |option_nodes| needs_name_option?(option_nodes) }
end
def needs_name_option?(option_nodes)
option_nodes.empty? || option_nodes.first.none? { |node| name_option?(node) }
end
end
end
end
end
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