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# frozen_string_literal: true
module Gitlab
module Graphql
module Pagination
module Keyset
class OrderInfo
attr_reader :attribute_name, :sort_direction, :named_function
def initialize(order_value)
@attribute_name, @sort_direction, @named_function =
if order_value.is_a?(String)
extract_nulls_last_order(order_value)
else
extract_attribute_values(order_value)
end
end
def operator_for(before_or_after)
case before_or_after
when :before
sort_direction == :asc ? '<' : '>'
when :after
sort_direction == :asc ? '>' : '<'
end
end
# Only allow specific node types
def self.build_order_list(relation)
order_list = relation.order_values.select do |value|
supported_order_value?(value)
end
order_list.map { |info| OrderInfo.new(info) }
end
def self.validate_ordering(relation, order_list)
if order_list.empty?
raise ArgumentError.new('A minimum of 1 ordering field is required')
end
if order_list.count > 2
# Keep in mind an order clause for primary key is added if one is not present
# lib/gitlab/graphql/pagination/keyset/connection.rb:97
raise ArgumentError.new('A maximum of 2 ordering fields are allowed')
end
# make sure the last ordering field is non-nullable
attribute_name = order_list.last&.attribute_name
if relation.columns_hash[attribute_name].null
raise ArgumentError.new("Column `#{attribute_name}` must not allow NULL")
end
if order_list.last.attribute_name != relation.primary_key
raise ArgumentError.new("Last ordering field must be the primary key, `#{relation.primary_key}`")
end
end
def self.supported_order_value?(order_value)
return true if order_value.is_a?(Arel::Nodes::Ascending) || order_value.is_a?(Arel::Nodes::Descending)
return false unless order_value.is_a?(String)
tokens = order_value.downcase.split
tokens.last(2) == %w(nulls last) && tokens.count == 4
end
private
def extract_nulls_last_order(order_value)
tokens = order_value.downcase.split
[tokens.first, (tokens[1] == 'asc' ? :asc : :desc), nil]
end
def extract_attribute_values(order_value)
named = nil
name = if ordering_by_lower?(order_value)
named = order_value.expr
named.expressions[0].name.to_s
else
order_value.expr.name
end
[name, order_value.direction, named]
end
# determine if ordering using LOWER, eg. "ORDER BY LOWER(boards.name)"
def ordering_by_lower?(order_value)
order_value.expr.is_a?(Arel::Nodes::NamedFunction) && order_value.expr&.name&.downcase == 'lower'
end
end
end
end
end
end
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