Trait toql::tree::tree_predicate::TreePredicate

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

Return the key column names

fn args<'a, I>(
    &self,
    descendents: I,
    args: &mut Vec<SqlArg, Global>
) -> Result<(), ToqlError> where
    I: Iterator<Item = FieldPath<'a>> + Clone, 

Return the key column values

Implementors

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