Struct FieldAttrs 

pub(crate) struct FieldAttrs {
    pub(crate) skip: bool,
    pub(crate) rename: Option<String>,
    pub(crate) as_list: bool,
    pub(crate) as_factor: bool,
    expand: bool,
    pub(crate) width: Option<usize>,
}

Parsed field-level #[dataframe(...)] attributes.

These attributes control how individual struct/enum fields map to DataFrame columns. Mutually exclusive combinations (as_list + expand, as_list + width, as_factor + as_list, as_factor + expand, as_factor + width) are rejected during parsing.

Fields

skip: bool

#[dataframe(skip)] – omit this field from the DataFrame entirely.

rename: Option<String>

#[dataframe(rename = "col")] – use a custom column name instead of the field name.

as_list: bool

#[dataframe(as_list)] – keep a collection field as a single R list column (suppresses automatic expansion into suffixed columns).

as_factor: bool

#[dataframe(as_factor)] – treat a unit-only inner enum field as an R factor column. Only valid on bare-ident enum types (no generic parameters). The inner enum must be unit-only (#[derive(DataFrameRow)] emits IntoR and IntoR for Vec<Option<Self>>).

expand: bool

#[dataframe(expand)] or #[dataframe(unnest)] – explicitly expand a collection field into multiple suffixed columns.

width: Option<usize>

#[dataframe(width = N)] – pin the expansion width for Vec<T>, Box<[T]>, or &[T] fields. Rows shorter than N get None for missing positions.

Trait Implementations

impl Default for FieldAttrs

fn default() -> FieldAttrs

Returns the “default value” for a type.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 48 bytes