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# frozen_string_literal: true
# Distinguish between a top level query and a subselect.
#
# Retrieve column values when the relation has already been loaded, otherwise reselect the relation.
# Useful for preload query patterns where the typical Rails #preload does not fit. Such as:
#
# projects = Project.where(...)
# projects.load
# ...
# options[members] = ProjectMember.where(...).where(source_id: projects.select(:id))
module Subquery
extend ActiveSupport::Concern
class_methods do
def subquery(*column_names, max_limit: 5_000)
if current_scope.loaded? && current_scope.size <= max_limit
current_scope.pluck(*column_names)
else
current_scope.reselect(*column_names)
end
end
end
end
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