one_to_one associations don’t use an eager limit strategy by default, but support both DISTINCT ON and window functions as strategies.
# File lib/sequel/model/associations.rb, line 545 def eager_limit_strategy cached_fetch(:_eager_limit_strategy) do offset = limit_and_offset.last case s = self.fetch(:eager_limit_strategy){(self[:model].default_eager_limit_strategy || :ruby) if offset} when Symbol s when true ds = associated_class.dataset if ds.supports_ordered_distinct_on? && offset.nil? :distinct_on elsif ds.supports_window_functions? :window_function else :ruby end else nil end end end
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