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Fixes #21577.
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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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This still isn't as separated as I'd like, but it at least moves most of
the burden of alias mapping in one place.
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Arel specifically handles `SelectManager`, with the same logic we're
currently performing. The AST is `Enumerable`, which Arel looks for
separately now.
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This adds the ability for rails apps or gems to have granular control
over how a domain object is converted to sql. One simple use case would
be to add support for Regexp. Another simple case would be something
like the following:
class DateRange < Struct.new(:start, :end)
def include?(date)
(start..end).cover?(date)
end
end
class DateRangePredicate
def call(attribute, range)
attribute.in(range.start..range.end)
end
end
ActiveRecord::PredicateBuilder.register_handler(DateRange,
DateRangePredicate.new)
More complex cases might include taking a currency object and converting
it from EUR to USD before performing the query.
By moving the existing handlers to this format, we were also able to
nicely refactor a rather nasty method in PredicateBuilder.
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