Module: Inferno::DSL::FHIRResourceNavigation

Included in:
Inferno::DSL::FHIREvaluation::Rules::AllMustSupportsPresent
Defined in:
lib/inferno/dsl/fhir_resource_navigation.rb

Overview

The FHIRResourceNavigation module is used to pick values from a FHIR resource, based on a profile. Originally intended for use for verifying the presence of Must Support elements on a resource and finding values to use for search parameters. The methods in this module related to slices expects pre-processed metadata defining the elements of the profile to be present in the attribute metadata in the including class.

See Also:

Constant Summary collapse

DAR_EXTENSION_URL = 
'http://hl7.org/fhir/StructureDefinition/data-absent-reason'.freeze
PRIMITIVE_DATA_TYPES = 
FHIR::PRIMITIVES.keys

Instance Method Summary collapse

Instance Method Details

#find_a_value_at(given_element, path, include_dar: false, &block) ⇒ Object

Get a value from the given FHIR element(s), by navigating through the resource to the given path. Fields with a DataAbsentReason extension present will be excluded unless include_dar is true. To filter the resulting elements, a block may be passed in.

Parameters:

Returns:

  • a single matching value (which can include false) or nil if not found



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# File 'lib/inferno/dsl/fhir_resource_navigation.rb', line 46

def find_a_value_at(given_element, path, include_dar: false, &block)
  return nil if given_element.nil?

  elements = Array.wrap(given_element)
  return find_in_elements(elements, include_dar:, &block) if path.empty?

  path_segments = path_segments(path)

  segment = path_segments.shift

  remaining_path = path_segments.join('.')
  elements.each do |element|
    child = get_next_value(element, segment)
    element_found = find_a_value_at(child, remaining_path, include_dar:, &block)
    return element_found if value_not_empty?(element_found)
  end

  nil
end

#resolve_path(elements, path) ⇒ Array<FHIR::Model>

Get a value from the given FHIR element(s) by walking the given path through the element.

Parameters:

Returns:



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# File 'lib/inferno/dsl/fhir_resource_navigation.rb', line 23

def resolve_path(elements, path)
  elements = Array.wrap(elements)
  return elements if path.blank?

  paths = path_segments(path)
  segment = paths.first
  remaining_path = paths.drop(1).join('.')

  elements.flat_map do |element|
    child = get_next_value(element, segment)
    resolve_path(child, remaining_path)
  end.compact
end