BelongsTo without 'get' prefix

[igormcoelho]

Sorry if this is a stupid question, I'm not very expert on js, sequelize, or sequelize-mock.
I wonder if belongsTo {as : 'nickname'} relation should always create 'getNickname' prefix, because it seems that original sequelize just creates the given name (in this case, just 'nickname').

Thanks for this amazing project!