An addition control has been added for hasMany serializer checks.

[osmanorhan]

This control added because when I try to add an additional model serializer with embed options, it assumes there is a hasMany relation but function (snapshot.hasMany) returns undefined.
Example:

X Model:
     name: DS.attr(),
     attr: DS.hasMany('attr'),

Y Model:
   code: DS.attr(),
   xs: DS.belongsTo('X')

Y Serializer:
import ApplicationSerializer from './application';
import DS from 'ember-data';
export default ApplicationSerializer.extend(DS.EmbeddedRecordsMixin, {
     attrs: {
        xs: { embedded: 'always' },
    },
});

In example, I want to use embedded "xs" when I save model but it gets error due to X.attr.

[codecov-io]

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