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I'm attempting to remove `klass` as a dependency of the predicate
builder, in favor of an object that better represents what we're using
it for. The only part of this which doesn't fit nicely into that picture
is the check for an association being polymorphic. Since I'm not yet
sure what that is going to look like, I've moved this logic into another
class in an attempt to separate things that will change from things that
won't.
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This reduces the number of places which will need to care about single
value or range specific logic as we introduce type casting. The array
handler is only responsible for producing `in` statements.
/cc @mrgilman
[Sean Griffin & Melanie Gilman]
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This will allow us to pass the predicate builder into the constructor of
these handlers. The procs had to be changed to objects, because the
`PredicateBuilder` needs to be marshalable. If we ever decide to make
`register_handler` part of the public API, we should come up with a
better solution which allows procs.
/cc @mrgilman
[Sean Griffin & Melanie Gilman]
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We're accidentally documenting `PredicateBuilder` and `ArrayHandler`
since there's a constant which is missing `# :nodoc:`
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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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Passing ranges to `#in` has been deprecated in Arel.
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The current style for warning messages without newlines uses
concatenation of string literals with manual trailing spaces
where needed.
Heredocs have better readability, and with `squish` we can still
produce a single line.
This is a similar use case to the one that motivated defining
`strip_heredoc`, heredocs are super clean.
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`User.where(id: [[1,2],3])` was equal to `User.where(id:[1, 2, 3])`
in Rails 4.1.x but because of some refactoring in Arel this stopped
working in 4.2.0. This fixes it in Rails.
[Dan Olson & Cristian Bica]
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Simplifies the code slightly, isolates non-nil non-range values into a
single array, which will make it easier to do things like apply type
casting to them in the future.
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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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