Trait TreePredicate

pub trait TreePredicate {
    // Required methods
    fn columns<'a, I>(descendents: I) -> Result<Vec<String>, ToqlError>
       where I: Iterator<Item = FieldPath<'a>>;
    fn args<'a, I>(
        &self,
        descendents: I,
        args: &mut Vec<SqlArg>,
    ) -> Result<(), ToqlError>
       where I: Iterator<Item = FieldPath<'a>> + Clone;
}

The trait allows to build the a key predicate for nested structs.

Required Methods

fn columns<'a, I>(descendents: I) -> Result<Vec<String>, ToqlError>

where I: Iterator<Item = FieldPath<'a>>,

Return the key column names

fn args<'a, I>( &self, descendents: I, args: &mut Vec<SqlArg>, ) -> Result<(), ToqlError>

where I: Iterator<Item = FieldPath<'a>> + Clone,

Return the key column values

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<T> TreePredicate for Join<T>

where T: Keyed + TreePredicate, <T as Keyed>::Key: Clone,