Don’t build empty objects on missing linked resources. #10
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According to the Spec (https://jsonapi.org/format/#document-resource-object-linkage), empty relationships are null by default. Object.new is roughly equal to an empty JSON ({}) in context of this deserializer. It is hard for us to recognize missing or non-present relationships if we have an object with no attributes. To avoid this, instead of a PORO, just nil is returned as reference to a non-present relationships.
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According to the Spec (https://jsonapi.org/format/#document-resource-object-linkage), empty relationships are null by default. Object.new is roughly equal to an empty JSON ({}) in context of this deserializer. It is hard for us to recognize missing or non-present relationships if we have an object with no attributes. To avoid this, instead of a PORO, just nil is returned as reference to a non-present relationships.