Trait ViewDefinitionWhereTrait 

pub trait ViewDefinitionWhereTrait {
    // Required method
    fn path(&self) -> Option<&str>;
}

Trait for abstracting ViewDefinitionWhere across FHIR versions.

This trait provides version-agnostic access to where clause definitions, which filter resources before processing. Where clauses use FHIRPath expressions that must evaluate to boolean or boolean-coercible values.

Filtering Logic

Resources are included in processing only if ALL where clauses evaluate to:

• true (boolean)
• Non-empty collections
• Any other “truthy” value

Resources are excluded if ANY where clause evaluates to:

• false (boolean)
• Empty collections
• Empty/null results

Examples

use helios_sof::traits::ViewDefinitionWhereTrait;

fn check_where_clause<T: ViewDefinitionWhereTrait>(where_clause: &T) {
    if let Some(path) = where_clause.path() {
        println!("Filter condition: {}", path);
         
        // Example paths:
        // "active = true"                  // Boolean condition
        // "name.exists()"                 // Existence check  
        // "birthDate >= @1990-01-01"      // Date comparison
        // "telecom.where(system='email')" // Collection filtering
    }
}

Required Methods

fn path(&self) -> Option<&str>

Returns the FHIRPath expression that must evaluate to true for resource inclusion

Implementations on Foreign Types

impl ViewDefinitionWhereTrait for ViewDefinitionWhere

fn path(&self) -> Option<&str>

Implementors