Enum ExprTarget 

pub enum ExprTarget<'a> {
    Free,
    Model(&'a ModelRoot),
    Table(&'a Table),
    Source(&'a SourceTable),
}

What an expression in the current scope references.

Determines how column and field references are resolved within an ExprContext.

Variants

Free

Expression does not reference any model or table.

Model(&'a ModelRoot)

Expression references a single model

Table(&'a Table)

Expression references a single table

Used primarily by database drivers

Source(&'a SourceTable)

Expression references a source table (a FROM clause with table references).

Implementations

impl<'a> ExprTarget<'a>

pub fn as_model(self) -> Option<&'a ModelRoot>

Returns the model if this target is ExprTarget::Model, or None.

pub fn as_model_unwrap(self) -> &'a ModelRoot

Returns the model, panicking if not ExprTarget::Model.

Panics

Panics if the target is not Model.

pub fn model_id(self) -> Option<ModelId>

Returns the model ID if this target is ExprTarget::Model, or None.

pub fn as_table(self) -> Option<&'a Table>

Returns the table if this target is ExprTarget::Table, or None.

pub fn as_table_unwrap(self) -> &'a Table

Returns the table, panicking if not ExprTarget::Table.

Panics

Panics if the target is not Table.

Trait Implementations

impl<'a> Clone for ExprTarget<'a>

fn clone(&self) -> ExprTarget<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for ExprTarget<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, T: Resolve> IntoExprTarget<'a, T> for ExprTarget<'a>

fn into_expr_target(self, schema: &'a T) -> ExprTarget<'a>

Converts self into an ExprTarget using the provided schema.

impl<'a> Copy for ExprTarget<'a>