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A change was made in Mongoid 7.1 that causes embedded fields accessors not to work on projected query results.

For example, say you have a Person document with a Passport document embedded in the passport field. The following code raises an error:

person = Person.only(:passport).first
number = person.passport.number
# ActiveModel::MissingAttributeError:
#      Missing attribute: 'number'.

Mongoid does not recognize the embedded field as one of the projected attributes.

is caused by

MONGOID-2681 Using #only with embedded documents sets omitted fields to default values

is duplicated by

MONGOID-4983 Embedded documents fetch using `only` raises MissingAttributeError

MONGOID-5010 Mongoid 7.1 upgrade documentation missing breaking change

is related to

MONGOID-5032 Hash attribute access/read_attribute fails on embedded field when parent loaded with only

links to