diff options
Diffstat (limited to 'lib/gitlab/graphql/pagination/keyset/order_info.rb')
| -rw-r--r-- | lib/gitlab/graphql/pagination/keyset/order_info.rb | 124 |
1 files changed, 0 insertions, 124 deletions
diff --git a/lib/gitlab/graphql/pagination/keyset/order_info.rb b/lib/gitlab/graphql/pagination/keyset/order_info.rb deleted file mode 100644 index 57e85ebe7f6..00000000000 --- a/lib/gitlab/graphql/pagination/keyset/order_info.rb +++ /dev/null @@ -1,124 +0,0 @@ -# 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, '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, '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, "Column `#{attribute_name}` must not allow NULL" - end - - if order_list.last.attribute_name != relation.primary_key - raise ArgumentError, "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 - - column_reference = tokens.first - sort_direction = tokens[1] == 'asc' ? :asc : :desc - - # Handles the case when the order value is coming from another table. - # Example: table_name.column_name - # Query the value using the fully qualified column name: pass table_name.column_name as the named_function - if fully_qualified_column_reference?(column_reference) - [column_reference, sort_direction, Arel.sql(column_reference)] - else - [column_reference, sort_direction, nil] - end - end - - # Example: table_name.column_name - def fully_qualified_column_reference?(attribute) - attribute.to_s.count('.') == 1 - end - - def extract_attribute_values(order_value) - if ordering_by_lower?(order_value) - [order_value.expr.expressions[0].name.to_s, order_value.direction, order_value.expr] - elsif ordering_by_case?(order_value) - ['case_order_value', order_value.direction, order_value.expr] - elsif ordering_by_array_position?(order_value) - ['array_position', order_value.direction, order_value.expr] - else - [order_value.expr.name, order_value.direction, nil] - end - 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 - - # determine if ordering using ARRAY_POSITION, eg. "ORDER BY ARRAY_POSITION(Array[4,3,1,2]::smallint, state)" - def ordering_by_array_position?(order_value) - order_value.expr.is_a?(Arel::Nodes::NamedFunction) && order_value.expr&.name&.downcase == 'array_position' - end - - # determine if ordering using CASE - def ordering_by_case?(order_value) - order_value.expr.is_a?(Arel::Nodes::Case) - end - end - end - end - end -end - -Gitlab::Graphql::Pagination::Keyset::OrderInfo.prepend_mod_with('Gitlab::Graphql::Pagination::Keyset::OrderInfo') |