Module embed_enum_optional 

Option<EmbeddedEnum> model fields.

A nullable embedded enum reuses its discriminant column as the head: NULL = None, a variant value = Some(variant). The data-enum decode Match gets a null else branch so a NULL (unmatched) discriminant decodes to None; a unit-only enum’s discriminant column reads back as None directly.

Variant-only predicates (.is_email()) on the optional path are not yet exposed — that needs the same Field path-machinery work deferred for nested-field access on Option<struct>. Whole-value .eq(Some(Variant)) covers variant matching here.

Functions

option_enum_create_ops

Driver-op coverage for create. A Some(variant) writes the variant discriminant to the (shared) discriminant column and the variant’s fields to their columns (other variants’ columns NULL); a None writes NULL to the discriminant and every variant column.

option_enum_crud

Round-trip Some(variant) and None for both a data enum and a unit enum.

option_enum_db_schema

The DB schema: nullable discriminant columns (named after the field) plus nullable variant-field columns for the data enum.

option_enum_filter_eq

Whole-value .eq(Some(variant)) matches the equal Some row and never None, for both a data variant and a unit variant.

option_enum_filter_ops

Driver-op coverage for filters. .is_none() / .is_some() emit a predicate on the single discriminant column (IS NULL / NOT (.. IS NULL)), never a check distributed across the variant columns.

option_enum_filter_presence

.is_none() / .is_some() on an Option<enum> filter the discriminant column’s null-ness.

option_enum_update

Updating the whole value in both directions for a data and a unit enum.

option_enum_update_ops

Driver-op coverage for updates. Setting Some(variant) assigns the variant discriminant + that variant’s column (others NULL); setting None assigns NULL to the discriminant and every variant column.