37 lines
1 KiB
Ruby
37 lines
1 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module FromExcept
|
|
extend ActiveSupport::Concern
|
|
|
|
class_methods do
|
|
# Produces a query that uses a FROM to select data using an EXCEPT.
|
|
#
|
|
# Example:
|
|
# groups = Group.from_except([group1.self_and_hierarchy, group2.self_and_hierarchy])
|
|
#
|
|
# This would produce the following SQL query:
|
|
#
|
|
# SELECT *
|
|
# FROM (
|
|
# SELECT "namespaces". *
|
|
# ...
|
|
#
|
|
# EXCEPT
|
|
#
|
|
# SELECT "namespaces". *
|
|
# ...
|
|
# ) groups;
|
|
#
|
|
# members - An Array of ActiveRecord::Relation objects to use in the except.
|
|
#
|
|
# remove_duplicates - A boolean indicating if duplicate entries should be
|
|
# removed. Defaults to true.
|
|
#
|
|
# alias_as - The alias to use for the sub query. Defaults to the name of the
|
|
# table of the current model.
|
|
# rubocop: disable Gitlab/Except
|
|
extend FromSetOperator
|
|
define_set_operator Gitlab::SQL::Except
|
|
# rubocop: enable Gitlab/Except
|
|
end
|
|
end
|