Method: JsonDataExtractor::Extractor#extract

Defined in:

lib/json_data_extractor/extractor.rb

#extract(schema) ⇒ Object

Parameters:

• schema (Hash) —

  schema of the expected data mapping

# File 'lib/json_data_extractor/extractor.rb', line 28

def extract(schema)
  schema.each do |key, val|
    element = JsonDataExtractor::SchemaElement.new(val.is_a?(Hash) ? val : { path: val })

    extracted_data = JsonPath.on(@data, element.path) if element.path

    if extracted_data.nil? || extracted_data.empty?
      # we either got nothing or the `path` was initially nil
      @results[key] = element.fetch_default_value
      next
    end

    # check for nils and apply defaults if applicable
    extracted_data.map! { |item| item.nil? ? element.fetch_default_value : item }

    # apply modifiers if present
    extracted_data = apply_modifiers(extracted_data, element.modifiers) if element.modifiers.any?

    # apply maps if present
    @results[key] = element.maps.any? ? apply_maps(extracted_data, element.maps) : extracted_data

    @results[key] = resolve_result_structure(@results[key], element)
  end

  @results
end