Updating an attribute that is a key of a GSI to nil (3.9.0)

[zak-raw]

Since 3.9.0, An error Aws::DynamoDB::Errors::ValidationException: Invalid attribute value type is raised when trying to update an attribute that is a key of a GSI to nil via save!, update_attributes!, etc.
This was possible until 3.8.0.

Also, it seems a configuration store_attribute_with_nil_value: false don't work.

Dynamoid.configure do |config|
  config.store_attribute_with_nil_value = false
end

class Hoge
  include Dynamoid::Document

  field :foo_id
  
  global_secondary_index(
    hash_key: :foo_id,
    projected_attributes: :all,
  )
end

hoge = Hoge.new(foo_id: 'bar').save!
hoge.foo_id = nil
hoge.save!
# 'Aws::DynamoDB::Errors::ValidationException: Invalid attribute value type' is raised.

[nbulaj]

Just faced the same issue. Not sure if it's AWS or Dynamoid

[andrykonchin]

Thank you for the bug report. I fixed the issue in #681. Could you please take a look and check whether it fixes your issue?

Not sure that it makes sense to prepare a patch-level release now because there is already one merged PR with refactoring and new feature (#655).

[zak-raw]

@andrykonchin Thank you for your prompt response. 🙇
I checked the diff and I think the issue is resolved.
I will update Gemfile and test our Rails application when 3.9.1 is released.