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