Explicit undefined, i.e. an omitted property.
undefined
Use for the absent branch of an optional relation assignment (belongsTo, hasOne, hasMany), so the field is skipped rather than nulled.
Type discriminator.
Explicit
undefined, i.e. an omitted property.Use for the absent branch of an optional relation assignment (belongsTo, hasOne, hasMany), so the field is skipped rather than nulled.