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++Setting an embeds_one to nil does not persist.

For example:

Mongoid::VERSION # => "7.0.1"

class A

  include Mongoid::Document

  embeds_one :b

end

class B

  include Mongoid::Document

  embedded_in :a

  field :memo, type: String

end

a = A.create(b: { memo: 'before' })

a.b.memo # => "before"

a.b = nil

a.b # => nil

a.save

a.reload

# I expect it to be nil

a.b # => #<B _id: 5b33301f13909416dbc0d480, memo: "before">

It works well in version 6.2.1.

In version 7.0.1 it works well when calling destroy method.

Thanks

is depended on by

MONGOID-4600 Release Mongoid 7.0.2