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`freeze` will ultimately end up freezing the `AttributeSet`, which in
turn freezes its `@attributes` hash. However, we actually insert a
special object to lazily instantiate the values of the hash on demand.
When it does need to actually instantiate all of them for iteration (the
only case is `ActiveRecord::Base#attributes`, which calls
`AttributeSet#to_h`), it will set an instance variable as a performance
optimization
Since it's just an optimization for subsequent calls, and that method
being called at all is a very uncommon case, we can just leave the ivar
alone if we're frozen, as opposed to coming up with some overly
complicated mechanism for freezing which allows us to continue to modify
ourselves.
Fixes #17960
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In real usage, we give the builder a types hash with a default value of
`Type::Value.new`. This means we need to explicitly check for the key,
rather than the truthiness of the type to determine if it's a known but
uninitialized attribute
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We don't know which attributes will or won't be used, and we don't want
to create massive bottlenecks at instantiation. Rather than doing *any*
iteration over types and values, we can lazily instantiate the object.
The lazy attribute hash should not fully implement hash, or subclass
hash at any point in the future. It is not meant to be a replacement,
but instead implement its own interface which happens to overlap.
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https://github.com/rails/rails/pull/15868/files#r14135210
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This allows using polymorphism for the uninitialized attributes raising
an exception behavior.
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This will make it less painful to add additional properties, which
should persist across writes, such as `name`.
Conflicts:
activerecord/lib/active_record/attribute_set.rb
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Move behavior of `read_attribute` to `AttributeSet`
Conflicts:
activerecord/lib/active_record/attribute_set.rb
activerecord/test/cases/attribute_set_test.rb
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Moved `Builder` to its own file, as it started looking very weird once I
added private methods to the `AttributeSet` class and the `Builder`
class started to grow.
Would like to refactor `fetch_value` to change to
```ruby
self[name].value(&block)
```
But that requires the attributes to know about their name, which they
currently do not.
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Move `attributes_before_type_cast` to `AttributeSet`
Conflicts:
activerecord/lib/active_record/attribute_set.rb
activerecord/test/cases/attribute_set_test.rb
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Return a null object from `AttributeSet#[]`
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Mostly delegation to start, but we can start moving a lot of behavior in
bulk to this object.
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