Custom Her Middleware to add additional pagination data to the response metadata

custom_parse_json.rb

# lib/custome_parse_json
# Custome middleware to include pagination data
class CustomParseJSON < Her::Middleware::ParseJSON
  # Parse the response body
  #
  # @param [String] body The response body
  # @param [Hash] header the respone header
  # @return [Mixed] the parsed response
  # @private
  def parse(body, header=nil)
    json = parse_json(body)
    errors = json.delete(:errors) || {}
    metadata = json.delete(:metadata) || {}

    data = {
      :data => json,
      :errors => errors,
      :metadata => metadata
    }

    # Add the pagination data to the metadata
    if header && header['total']
      data[:metadata].merge total: header['total']
    end

    data
  end

  # This method is triggered when the response has been received. It modifies
  # the value of `env[:body]`.
  #
  # @param [Hash] env The response environment
  # @private
  def on_complete(env)
    env[:body] = case env[:satus]
                 when 204
                   parse('{}')
                 else
                   parse(env[:body], env[:response_headers])
                 end
  end
end