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Merge pull request #39215 from jonathanhefner/clarify-upgrade-guide-39213

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Clarify existing app behavior when being upgraded [ci skip]
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Jonathan Hefner 2020-05-10 12:12:33 -05:00 committed by GitHub
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guides/source/upgrading_ruby_on_rails.md
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@ -531,7 +531,7 @@ When using the Classic Autoloader in Rails 6 application it is recommended to se
### Active Storage assignment behavior change
In Rails 5.2, assigning to a collection of attachments declared with `has_many_attached` appended new files:
With the configuration defaults for Rails 5.2, assigning to a collection of attachments declared with `has_many_attached` appends new files:
```ruby
class User < ApplicationRecord
@ -549,8 +549,7 @@ user.highlights.first.filename # => "funky.jpg"
user.highlights.second.filename # => "town.jpg"
```
With the default configuration for Rails 6.0, assigning to a collection of attachments replaces existing files
instead of appending to them. This matches Active Record behavior when assigning to a collection association:
With the configuration defaults for Rails 6.0, assigning to a collection of attachments replaces existing files instead of appending to them. This matches Active Record behavior when assigning to a collection association:
```ruby
user.highlights.attach(filename: "funky.jpg", ...)
@ -574,8 +573,7 @@ user.highlights.first.filename # => "funky.jpg"
user.highlights.second.filename # => "town.jpg"
```
Opt in to the new default behavior by setting `config.active_storage.replace_on_assign_to_many` to `true`.
The old behavior will be deprecated in Rails 6.1 and removed in a subsequent release.
Existing applications can opt in to this new behavior by setting `config.active_storage.replace_on_assign_to_many` to `true`. The old behavior will be deprecated in Rails 6.1 and removed in a subsequent release.
Upgrading from Rails 5.1 to Rails 5.2
-------------------------------------