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Assigning to a collection of attachments appends rather than replacing, as in 5.2. Existing 5.2 apps that rely on this behavior will no longer break when they're upgraded to 6.0.
For apps generated on 6.0 or newer, assigning replaces the existing attachments in the collection. #attach should be used to add new attachments to the collection without removing existing ones.
I expect that we'll deprecate the old behavior in 6.1.
Closes #36374.
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attaching `::One`
Consider a model with `One` and `Many` attachments configured:
class User < ActiveRecord::Base
has_one_attached :avatar
has_many_attached :highlights
end
=== One Attachment
After attaching `One` attachment (`:avatar`), we can see that the associated
`_blob` record (`:avatar_blob`) still returns as `nil`.
user.avatar.attach(blob)
user.avatar_attachment.present? => true
user.avatar_blob.present? => false # Incorrect!
This is a false negative. It happens because after the attachment and blob
are built:
1. The record already has its `_blob` association loaded, as `nil`
2. the `::Attachment` is associated with the record but the `::Blob` only gets
associated with the `::Attachment`, not the record itself
In reality, the blob does in fact exist. We can verify this as follows:
user.avatar.attach(blob)
user.avatar_attachment.blob.present? => true # Blob does exist!
The fix in this change is to simply assign the `::Blob` when assigning
the `::Attachment`. After this fix is applied, we correctly observe:
user.avatar.attach(blob)
user.avatar_attachment.present? => true
user.avatar_blob.present? => true # Woohoo!
=== Many Attachments
We don't see this issue with `Many` attachments because the `_blob` association
is already loaded as part of attaching more/newer blobs.
user.highlights.attach(blob)
user.highlights_attachments.any? => true
user.highlights_blobs.any? => true
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since Ruby 2.5
https://bugs.ruby-lang.org/issues/14133
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Do nothing instead of raising an error when it’s called on an attached blob.
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overwrite previous attachments
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