Struct Field 

pub struct Field {

    pub name: Name,
    pub dtype: &'static str,
    pub id: bool,
    pub keyed: bool,
    pub many: bool,
    pub optional: bool,
    pub unique: bool,
    pub index: bool,
    pub pick: Option<Pick>,
    pub default: Option<DefaultFn>,
    pub link: Option<Link>,
    pub widget: fn() -> Widget,
    pub parse: fn(&str, &mut dyn Writer) -> Result<(), StoreError>,
    pub text: fn(&mut dyn Reader) -> String,
}

Spec for one column of a schema.

Fields

name: Name

Column name.

dtype: &'static str

SQL type name (INTEGER, REAL, or TEXT).

id: bool

Autoincrement primary key column.

keyed: bool

Primary key with a caller-supplied value.

many: bool

Virtual many-to-many column, not stored inline.

optional: bool

Nullable column.

unique: bool

Unique constraint.

index: bool

Indexed column.

pick: Option<Pick>

Fixed choice list, if any.

default: Option<DefaultFn>

Default value factory, if any.

link: Option<Link>

Reference to another table, if any.

widget: fn() -> Widget

Widget for this field.

parse: fn(&str, &mut dyn Writer) -> Result<(), StoreError>

Parses raw text into the field’s value.

text: fn(&mut dyn Reader) -> String

Renders the field’s value as text.

Implementations

impl Field

pub fn cell<T: Storable + Show>(name: &'static str) -> Self

A plain column storing any Storable + Show type.

pub fn id() -> Self

An autoincrement id primary key column.

pub fn key<T: Storable + Show>(name: &'static str) -> Self

A caller-supplied primary key column.

pub fn str(name: &'static str) -> Self

A string column.

pub fn check(name: &'static str) -> Self

A boolean column.

pub fn many(name: &'static str) -> Self

A virtual many-to-many column.

pub fn optional(self) -> Self

Marks the column nullable.

pub fn unique(self) -> Self

Adds a unique constraint.

pub fn indexed(self) -> Self

Marks the column indexed.

pub fn default_value(self, value: impl Storable) -> Self

Sets a static default Storable value.

pub fn default( self, make: impl Fn(&mut dyn Writer) + Send + Sync + 'static, ) -> Self

Sets a default value factory.

pub fn references(self, target: &'static str) -> Self

Links to another table’s column ("table.column" or just "table").

pub fn link(self, link: Link) -> Self

Sets a Link to another table.

pub fn reference(&self) -> Option<(Table, Name)>

The referenced (table, column) for a direct link, if any.

pub fn load(&self) -> Widget

The field’s Widget.

pub fn initial(&self) -> Value

The field’s default as a Value, or Value::Null.

Trait Implementations

impl Clone for Field

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.