Class: Inferno::DSL::MustSupportMetadataExtractor

Inherits:
Object
  • Object
show all
Defined in:
lib/inferno/dsl/must_support_metadata_extractor.rb

Overview

The MustSupportMetadataExtractor takes a StructureDefinition and parses it into a hash-based metadata that simplifies checking for MustSupport elements. MustSupport elements may be either plain elements, extensions, or slices. This logic was originally developed for the US Core Test Kit and has been migrated into Inferno core.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(profile_elements, profile, resource, ig_resources, requirement_extension_url = nil) ⇒ MustSupportMetadataExtractor

Construct a new extractor

Parameters:

  • profile_elements (Array<FHIR::ElementDefinition>) —

    the elements of the profile to consider, ie, profile.snapshot.element

  • profile (FHIR::StructureDefinition) —

    the profile to parse

  • resource (String) —

    the resourceType that the profile applies to, ie, profile.type

  • ig_resources (Inferno::Entities::IG)
  • requirement_extension_url (String) (defaults to: nil) —

    the URL of an extension to flag elements as required even if not MS



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 19

def initialize(profile_elements, profile, resource, ig_resources, requirement_extension_url = nil)
  self.profile_elements = profile_elements
  self.profile = profile
  self.resource = resource
  self.ig_resources = ig_resources
  self.requirement_extension_url = requirement_extension_url
end

Instance Attribute Details

#ig_resources ⇒ Object

Returns the value of attribute ig_resources.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 10

def ig_resources
  @ig_resources
end

#profile ⇒ Object

Returns the value of attribute profile.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 10

def profile
  @profile
end

#profile_elements ⇒ Object

Returns the value of attribute profile_elements.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 10

def profile_elements
  @profile_elements
end

#requirement_extension_url ⇒ Object

Returns the value of attribute requirement_extension_url.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 10

def requirement_extension_url
  @requirement_extension_url
end

#resource ⇒ Object

Returns the value of attribute resource.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 10

def resource
  @resource
end

Instance Method Details

#all_must_support_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 77

def all_must_support_elements
  profile_elements.select { |element| element.mustSupport || by_requirement_extension_only?(element) }
end

#by_requirement_extension_only?(element) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 70

def by_requirement_extension_only?(element)
  requirement_extension_url && !element.mustSupport &&
    element.extension.any? do |extension|
      extension.url == requirement_extension_url && extension.valueBoolean
    end
end

#canonical_url_without_version(url) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 108

def canonical_url_without_version(url)
  url&.split('|')&.first
end

#discriminator_path(discriminator) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 291

def discriminator_path(discriminator)
  if discriminator.path == '$this'
    ''
  elsif discriminator.path.start_with?('$this.')
    discriminator.path[6..]
  else
    discriminator.path
  end
end

#discriminators(slice) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 126

def discriminators(slice)
  slice&.slicing&.discriminator
end

#element_matches_choice_type?(element, target_path, target_type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 221

def element_matches_choice_type?(element, target_path, target_type)
  [element.id, element.path].include?(target_path) &&
    element.type.any? { |type| type.code.casecmp?(target_type) }
end

#element_part_of_slice_discrimination?(element) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 396

def element_part_of_slice_discrimination?(element)
  must_support_slice_elements.any? { |ms_slice| element.id.include?(ms_slice.id) }
end

#extension_discriminator_step?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 154

def extension_discriminator_step?(path)
  path.start_with?('extension(') || path.start_with?('modifierExtension(')
end

#extension_profile_matches?(type, ext_url) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 170

def extension_profile_matches?(type, ext_url)
  type.code == 'Extension' && type.profile.any? { |profile| profile.start_with?(ext_url) }
end

#extension_slice_name(element_id) ⇒ String?

The name of the deepest slice in a FHIR ElementDefinition id, eg "us-core-race" for "Patient.extension:us-core-race" or "ombCategory" for "Patient.extension:us-core-race.extension:ombCategory".

Parameters:

  • element_id (String)

Returns:

  • (String, nil) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 104

def extension_slice_name(element_id)
  element_id.split('.').reverse.find { |segment| segment.include?(':') }&.split(':', 2)&.last
end

#extract_required_binding_values(pattern_element, metadata) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 268

def extract_required_binding_values(pattern_element, metadata)
  value_extractor = ValueExtractor.new(ig_resources, resource, profile_elements)

  value_extractor.codings_from_value_set_binding(pattern_element).presence ||
    value_extractor.values_from_resource_metadata([metadata[:path]]).presence || []
end

#extract_supported_types(current_element) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 516

def extract_supported_types(current_element)
  current_element.type.select { |type| save_type_code?(type) }.map(&:code)
end

#extract_target_profiles(type) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 453

def extract_target_profiles(type)
  target_profiles = []

  if type.targetProfile&.length == 1
    target_profiles << type.targetProfile.first
  else
    type.source_hash['_targetProfile']&.each_with_index do |hash, index|
      if hash.present?
        element = FHIR::Element.new(hash)
        target_profiles << type.targetProfile[index] if type_must_support_extension?(element.extension)
      end
    end
  end

  target_profiles
end

#find_choice_element(current_element, target_element, target_type) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 213

def find_choice_element(current_element, target_element, target_type)
  [current_element.id, current_element.path].filter_map do |base_path|
    profile_elements.find do |element|
      element_matches_choice_type?(element, "#{base_path}.#{target_element}", target_type)
    end
  end.first
end

#find_element_by_discriminator_path(current_element, discriminator_path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 136

def find_element_by_discriminator_path(current_element, discriminator_path)
  target_element = current_element
  remaining_path = discriminator_path

  while remaining_path.present?
    target_element, remaining_path = take_discriminator_step(target_element, remaining_path)
    return nil if target_element.nil?
  end

  target_element
end

#get_type_must_support_metadata(current_metadata, current_element) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 429

def get_type_must_support_metadata(current_metadata, current_element)
  current_element.type.map do |type|
    next unless type_must_support_extension?(type.extension)

    metadata =
      {
        path: "#{current_metadata[:path].delete_suffix('[x]')}#{type.code.upcase_first}",
        original_path: current_metadata[:path]
      }
    metadata[:types] = [type.code] if save_type_code?(type)
    handle_type_must_support_target_profiles(type, metadata) if type.code == 'Reference'

    metadata
  end.compact
end

#handle_choice_type_in_sliced_element(current_metadata, must_support_elements_metadata) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 470

def handle_choice_type_in_sliced_element(current_metadata, must_support_elements_metadata)
  choice_element_metadata = must_support_elements_metadata.find do |metadata|
    metadata[:original_path].present? &&
      current_metadata[:path].include?(metadata[:original_path])
  end

  return unless choice_element_metadata.present?

  current_metadata[:original_path] = current_metadata[:path]
  current_metadata[:path] =
    current_metadata[:path].sub(choice_element_metadata[:original_path], choice_element_metadata[:path])
end

#handle_fixed_values(metadata, element) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 404

def handle_fixed_values(metadata, element)
  if value_not_empty?(element.fixed)
    metadata[:fixed_value] = element.fixed
  elsif element.patternCodeableConcept.present? && !element_part_of_slice_discrimination?(element)
    metadata[:fixed_value] = element.patternCodeableConcept.coding.first.code
    metadata[:path] += '.coding.code'
  elsif element.fixedCode.present?
    metadata[:fixed_value] = element.fixedCode
  elsif element.patternIdentifier.present? && !element_part_of_slice_discrimination?(element)
    metadata[:fixed_value] = element.patternIdentifier.system
    metadata[:path] += '.system'
  end
end

#handle_type_must_support_target_profiles(type, metadata) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 445

def handle_type_must_support_target_profiles(type, metadata)
  target_profiles = extract_target_profiles(type)

  # remove target_profile for FHIR Base resource type.
  target_profiles.delete_if { |reference| reference.start_with?('http://hl7.org/fhir/StructureDefinition') }
  metadata[:target_profiles] = target_profiles if target_profiles.present?
end

#legacy_choice_discriminator_step?(path) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 190

def legacy_choice_discriminator_step?(path)
  path.match?(/\A.+\s+as\s+[[:word:]]+\z/)
end

#must_support_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 483

def must_support_elements
  must_support_elements_metadata = []
  plain_must_support_elements.each do |current_element|
    current_metadata = {
      path: current_element.id.gsub("#{resource}.", '')
    }
    current_metadata[:by_requirement_extension_only] = true if by_requirement_extension_only?(current_element)

    type_must_support_metadata = get_type_must_support_metadata(current_metadata, current_element)

    if type_must_support_metadata.any?
      must_support_elements_metadata.concat(type_must_support_metadata)
    else
      handle_choice_type_in_sliced_element(current_metadata, must_support_elements_metadata)

      supported_types = extract_supported_types(current_element)
      current_metadata[:types] = supported_types if supported_types.present?

      if current_element.type.first&.code == 'Reference'
        handle_type_must_support_target_profiles(current_element.type.first,
                                                 current_metadata)
      end

      handle_fixed_values(current_metadata, current_element)

      remove_conflicting_metadata_without_fixed_value(must_support_elements_metadata, current_metadata)

      must_support_elements_metadata << current_metadata
    end
  end
  must_support_elements_metadata.uniq
end

#must_support_extension_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 81

def must_support_extension_elements
  all_must_support_elements.select { |element| element.path.end_with? 'xtension' }
end

#must_support_extensions ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 85

def must_support_extensions
  must_support_extension_elements.map do |element|
    {
      id: element.id,
      slice_name: extension_slice_name(element.id),
      path: element.path.gsub("#{resource}.", ''),
      url: canonical_url_without_version(element.type.first.profile.first),
      modifier_extension: element.path.end_with?('modifierExtension')
    }.tap do |metadata|
      metadata[:by_requirement_extension_only] = true if by_requirement_extension_only?(element)
    end
  end
end

#must_support_slice_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 112

def must_support_slice_elements
  profile_elements.select do |element|
    next false if element.sliceName.blank? || element.path.end_with?('xtension')

    all_must_support_elements.include?(element) || slice_has_must_support_descendants?(element)
  end
end

#must_support_slices ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 388

def must_support_slices
  type_slices + value_slices
end

#must_support_type_slice_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 275

def must_support_type_slice_elements
  must_support_slice_elements.select do |element|
    discriminators(sliced_element(element))&.first&.type == 'type'
  end
end

#must_support_value_slice_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 326

def must_support_value_slice_elements
  must_support_slice_elements.select do |element|
    # discriminator type 'pattern' is deprecated in FHIR R5 and made equivalent to 'value'
    ['value', 'pattern'].include?(discriminators(sliced_element(element))&.first&.type)
  end
end

#must_supports ⇒ Hash

Retrieval method for the must support metadata

Returns:

  • (Hash) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 45

def must_supports
  @must_supports ||= {
    extensions: must_support_extensions,
    slices: must_support_slices,
    elements: must_support_elements,
    recursive_elements: recursive_element_segments
  }
end

#navigation_compatible_discriminator_path(discriminator_path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 281

def navigation_compatible_discriminator_path(discriminator_path)
  normalized_path = discriminator_path&.gsub(/(modifierExtension|extension)\('([^']+)'\)/, "\\1.where(url='\\2')")
  normalized_path = normalized_path&.gsub(/([[:word:]\[\]]+)\.ofType\(([^)]+)\)/) do
    "#{Regexp.last_match(1).delete_suffix('[x]')}#{Regexp.last_match(2).upcase_first}"
  end
  normalized_path&.gsub(/([[:word:]\[\]]+)\s+as\s+([[:word:]]+)/) do
    "#{Regexp.last_match(1).delete_suffix('[x]')}#{Regexp.last_match(2).upcase_first}"
  end
end

#plain_must_support_elements ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 392

def plain_must_support_elements
  all_must_support_elements - must_support_extension_elements - must_support_slice_elements
end

#profile_name ⇒ String

Returns the human-readable name of the profile, eg for display purposes. Collapses any runs of repeated whitespace, since profile titles occasionally have them.

Returns:

  • (String) —

    the human-readable name of the profile, eg for display purposes. Collapses any runs of repeated whitespace, since profile titles occasionally have them.



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 34

def profile_name
  profile.title&.squeeze(' ')
end

#profile_url ⇒ String

Returns the canonical URL of the profile.

Returns:

  • (String) —

    the canonical URL of the profile



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 28

def profile_url
  profile.url
end

#profile_version ⇒ String

Returns the version of the profile itself (distinct from the IG's own version).

Returns:

  • (String) —

    the version of the profile itself (distinct from the IG's own version)



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 39

def profile_version
  profile.version
end

#recursive_element_segments ⇒ Array<String>

Names of path segments that are self-referential, ie, they may repeat at arbitrary depth. FHIR marks this with a contentReference back to an ancestor element instead of re-declaring the element's children, eg, Questionnaire.item.item has a contentReference of "#Questionnaire.item". A MustSupport flag on an element under such a segment (eg Questionnaire.item.text) should be considered met if it's populated at any depth of nesting (item.text, item.item.text, item.item.item.text, ...), not just the literal depth at which the flag is declared. NOTE: does not currently handle sliced recursive elements.

Returns:

  • (Array<String>) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 63

def recursive_element_segments
  profile_elements
    .select { |element| element.contentReference.present? }
    .map { |element| element.id.split('.').last }
    .uniq
end

#remove_conflicting_metadata_without_fixed_value(must_support_elements_metadata, current_metadata) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 520

def remove_conflicting_metadata_without_fixed_value(must_support_elements_metadata, current_metadata)
  must_support_elements_metadata.delete_if do |metadata|
    metadata[:path] == current_metadata[:path] && metadata[:fixed_value].blank?
  end
end

#required_binding_pattern?(pattern_element) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 264

def required_binding_pattern?(pattern_element)
  pattern_element.binding&.strength == 'required' && pattern_element.binding&.valueSet
end

#save_pattern_slice(pattern_element, discriminator_path, metadata) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 226

def save_pattern_slice(pattern_element, discriminator_path, metadata)
  runtime_path = navigation_compatible_discriminator_path(discriminator_path)

  if pattern_element.patternCodeableConcept
    {
      type: 'patternCodeableConcept',
      path: runtime_path,
      code: pattern_element.patternCodeableConcept.coding.first.code,
      system: pattern_element.patternCodeableConcept.coding.first.system
    }
  elsif pattern_element.patternCoding
    {
      type: 'patternCoding',
      path: runtime_path,
      code: pattern_element.patternCoding.code,
      system: pattern_element.patternCoding.system
    }
  elsif pattern_element.patternIdentifier
    {
      type: 'patternIdentifier',
      path: runtime_path,
      system: pattern_element.patternIdentifier.system
    }
  elsif required_binding_pattern?(pattern_element)
    {
      type: 'requiredBinding',
      path: runtime_path,
      values: extract_required_binding_values(pattern_element, metadata)
    }
  else
    # prevent errors in case an IG does something different
    {
      type: 'unsupported',
      path: runtime_path
    }
  end
end

#save_type_code?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 425

def save_type_code?(type)
  type.code == 'Reference'
end

#slice_has_must_support_descendants?(slice) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 130

def slice_has_must_support_descendants?(slice)
  all_must_support_elements.any? do |element|
    element.id.start_with?("#{slice.id}.")
  end
end

#sliced_element(slice) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 120

def sliced_element(slice)
  profile_elements.find do |element|
    element.id == slice.path || element.id == slice.id.sub(":#{slice.sliceName}", '')
  end
end

#take_choice_discriminator_step(current_element, step_path, remaining_path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 194

def take_choice_discriminator_step(current_element, step_path, remaining_path)
  target_element = "#{step_path}[x]"
  target_type, remaining_path = remaining_path.delete_prefix('ofType(').split(')', 2)
  next_element = profile_elements.find do |element|
    element.id == "#{current_element.id}.#{target_element}" &&
      element.type.any? { |type| type.code.casecmp?(target_type) }
  end

  [next_element, remaining_path&.delete_prefix('.')]
end

#take_discriminator_step(current_element, path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 148

def take_discriminator_step(current_element, path)
  return take_extension_discriminator_step(current_element, path) if extension_discriminator_step?(path)

  take_standard_discriminator_step(current_element, path)
end

#take_extension_discriminator_step(current_element, path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 158

def take_extension_discriminator_step(current_element, path)
  extension_type = path.start_with?('modifierExtension(') ? 'modifierExtension' : 'extension'
  ext_url, remaining_path = path.delete_prefix("#{extension_type}('").split("')", 2)
  next_element = profile_elements.find do |element|
    element.path == "#{current_element.path}.#{extension_type}" &&
      element.id.start_with?("#{current_element.id}.#{extension_type}:") &&
      element.type.any? { |type| extension_profile_matches?(type, ext_url) }
  end

  [next_element, remaining_path&.delete_prefix('.')]
end

#take_legacy_choice_discriminator_step(current_element, step_path, remaining_path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 205

def take_legacy_choice_discriminator_step(current_element, step_path, remaining_path)
  target_element, target_type = step_path.split(/\s+as\s+/, 2)
  target_element = "#{target_element}[x]" unless target_element.end_with?('[x]')
  next_element = find_choice_element(current_element, target_element, target_type)

  [next_element, remaining_path&.delete_prefix('.')]
end

#take_standard_discriminator_step(current_element, path) ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 174

def take_standard_discriminator_step(current_element, path)
  step_path, remaining_path = path.split('.', 2)
  if remaining_path&.start_with?('ofType(')
    return take_choice_discriminator_step(current_element, step_path, remaining_path)
  end
  if legacy_choice_discriminator_step?(step_path)
    return take_legacy_choice_discriminator_step(current_element, step_path, remaining_path)
  end

  next_element =
    profile_elements.find { |element| element.id == "#{current_element.id}.#{step_path}" } ||
    profile_elements.find { |element| element.id == "#{current_element.path}.#{step_path}" }

  [next_element, remaining_path&.delete_prefix('.')]
end

#type_must_support_extension?(extensions) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 418

def type_must_support_extension?(extensions)
  extensions&.any? do |extension|
    extension.url == 'http://hl7.org/fhir/StructureDefinition/elementdefinition-type-must-support' &&
      extension.valueBoolean
  end
end

#type_slices ⇒ Object 



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 301

def type_slices
  must_support_type_slice_elements.map do |current_element|
    discriminator = discriminators(sliced_element(current_element)).first
    type_path = discriminator_path(discriminator)
    type_element = find_element_by_discriminator_path(current_element, type_path)

    type_code = type_element.type.first.code
    discriminator_metadata = {
      type: 'type',
      code: type_code.upcase_first
    }
    runtime_path = navigation_compatible_discriminator_path(type_path)
    discriminator_metadata[:path] = runtime_path if runtime_path.present?

    {
      slice_id: current_element.id,
      slice_name: current_element.sliceName,
      path: current_element.path.gsub("#{resource}.", ''),
      discriminator: discriminator_metadata
    }.tap do |metadata|
      metadata[:by_requirement_extension_only] = true if by_requirement_extension_only?(current_element)
    end
  end
end

#value_not_empty?(value) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 400

def value_not_empty?(value)
  value.present? || value == false
end

#value_slices ⇒ Object

rubocop:disable Metrics/CyclomaticComplexity



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# File 'lib/inferno/dsl/must_support_metadata_extractor.rb', line 333

def value_slices # rubocop:disable Metrics/CyclomaticComplexity
  must_support_value_slice_elements.map do |current_element|
    {
      slice_id: current_element.id,
      slice_name: current_element.sliceName,
      path: current_element.path.gsub("#{resource}.", '')
    }.tap do |metadata|
      fixed_values = []
      pattern_value = {}

      element_discriminators = discriminators(sliced_element(current_element))

      element_discriminators.each do |discriminator|
        discriminator_path = discriminator_path(discriminator)
        pattern_element = find_element_by_discriminator_path(current_element, discriminator_path)

        # This is a workaround for a known version of a profile that has a bad discriminator:
        # the discriminator refers to a nested field within a CodeableConcept,
        # but the profile doesn't contain an element definition for it, so there's no way to
        # define a fixed value on the element to define the slice.
        # In this instance the element has a second (good) discriminator on the CodeableConcept field itself,
        # and in subsequent versions of the profile, the bad discriminator was removed.
        next if pattern_element.nil? && element_discriminators.length > 1

        if pattern_element.nil?
          pattern_value = {
            type: 'unsupported',
            path: navigation_compatible_discriminator_path(discriminator_path)
          }
        elsif value_not_empty?(pattern_element.fixed)
          fixed_values << {
            path: navigation_compatible_discriminator_path(discriminator_path),
            value: pattern_element.fixed
          }
        elsif pattern_value.present?
          raise StandardError, "Found more than one pattern slices for the same element #{pattern_element}."
        else
          pattern_value = save_pattern_slice(pattern_element, discriminator_path, metadata)
        end
      end

      if fixed_values.present?
        metadata[:discriminator] = {
          type: 'value',
          values: fixed_values
        }
      elsif pattern_value.present?
        metadata[:discriminator] = pattern_value
      end

      metadata[:by_requirement_extension_only] = true if by_requirement_extension_only?(current_element)
    end
  end
end