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This reverts commit 3420a14590c0e6915d8b6c242887f74adb4120f9, reversing
changes made to afb66a5a598ce4ac74ad84b125a5abf046dcf5aa.
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The current code base is not uniform. After some discussion,
we have chosen to go with double quotes by default.
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As mentioned in 7b86ea6715ee987e61a7f3bd8e72b1bbfcfbbbe7, this is an
internal class.
[ci skip]
r? @sgrif
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ActiveRecord::AttributeSet::YAMLEncoder#decode"
This reverts commit 7ea502ae141fc26b736c7a73bdf7a676b1f9fc87, per
internal discussion with @sgrif -- this is documenting the
implementation of a class that isn't intended to be public API.
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This reduces the size of a YAML encoded Active Record object by ~80%
depending on the number of columns. There were a number of wasteful
things that occurred when we encoded the objects before that have
resulted in numerous wins
- We were emitting the result of `attributes_before_type_cast` as a hack
to work around some laziness issues
- The name of an attribute was emitted multiple times, since the
attribute objects were in a hash keyed by the name. We now store them
in an array instead, and reconstruct the hash using the name
- The types were included for every attribute. This would use backrefs
if multiple objects were encoded, but really we don't need to include
it at all unless it differs from the type at the class level. (The
only time that will occur is if the field is the result of a custom
select clause)
- `original_attribute:` was included over and over and over again since
the ivar is almost always `nil`. We've added a custom implementation
of `encode_with` on the attribute objects to ensure we don't write the
key when the field is `nil`.
This isn't without a cost though. Since we're no longer including the
types, an object can find itself in an invalid state if the type changes
on the class after serialization. This is the same as 4.1 and earlier,
but I think it's worth noting.
I was worried that I'd introduce some new state bugs as a result of
doing this, so I've added an additional test that asserts mutation not
being lost as the result of YAML round tripping.
Fixes #25145
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