Class: GtfsDf::Graph

Inherits:
Object
  • Object
show all
Defined in:
lib/gtfs_df/graph.rb

Constant Summary collapse

FILES = 
%w[
  agency routes trips stop_times calendar calendar_dates shapes transfers frequencies fare_attributes fare_rules
  fare_leg_join_rules fare_transfer_rules areas networks route_networks location_groups location_group_stops booking_rules
  stop_areas fare_leg_rules
]
STANDARD_FILE_NODES = 
FILES.map do |file|
  [file, {id: file, file: file, filter: nil}]
end.to_h.freeze
STOP_NODES =

Separate node definitions for stops and parent stations to handle the self-referential relationship in stops.txt where stops reference parent stations via parent_station column. This allows filtering to preserve parent stations when their child stops are referenced.

{
  "stops" => {
    id: "stops",
    file: "stops",
    filter_attrs: {
      filter_col: "location_type",
      filter: Polars.col("location_type").is_in(
        Schema::EnumValues::STOP_LOCATION_TYPES.map(&:first)
      ) | Polars.col("location_type").is_null
    }
  },
  "parent_stations" => {
    id: "parent_stations",
    file: "stops",
    filter_attrs: {
      filter_col: "location_type",
      filter: Polars.col("location_type").is_in(
        Schema::EnumValues::STATION_LOCATION_TYPES.map(&:first)
      ) & Polars.col("location_type").is_not_null
    }
  }
}.freeze
NODES = 
STANDARD_FILE_NODES.merge(STOP_NODES).freeze

Class Method Summary collapse

Class Method Details

.build(bidirectional: false) ⇒ Object

Returns a directed graph of GTFS file dependencies



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# File 'lib/gtfs_df/graph.rb', line 44

def self.build(bidirectional: false)
  g = NetworkX::DiGraph.new
  NODES.keys.each { |node| g.add_node(node) }

  # Edges should be parent, child
  # TODO: Add fare_rules -> stops + test
  edges = [
    ["agency", "routes", {dependencies: [
      {"agency" => "agency_id", "routes" => "agency_id"}
    ]}],
    ["agency", "fare_attributes", {dependencies: [
      {"fare_attributes" => "agency_id",
       "agency" => "agency_id", :allow_null => true}
    ], optional: true}],
    ["fare_attributes", "fare_rules", {dependencies: [
      {"fare_attributes" => "fare_id",
       "fare_rules" => "fare_id"}
    ]}],
    ["routes", "fare_rules", {dependencies: [
      {"fare_rules" => "route_id", "routes" => "route_id", :allow_null => true}
    ], optional: true}],
    ["routes", "trips", {dependencies: [
      {"routes" => "route_id", "trips" => "route_id"}
    ]}],
    ["trips", "stop_times", {dependencies: [
      {"trips" => "trip_id", "stop_times" => "trip_id"}
    ]}],
    ["stops", "stop_times", {dependencies: [
      {"stop_times" => "stop_id", "stops" => "stop_id"}
    ]}],
    # Self-referential edge: stops can reference parent stations (location_type=1)
    ["parent_stations", "stops", {dependencies: [
      {"stops" => "parent_station", "parent_stations" => "stop_id", :allow_null => true}
    ]}],
    ["stops", "transfers", {dependencies: [
      {"stops" => "stop_id", "transfers" => "from_stop_id"},
      {"stops" => "stop_id", "transfers" => "to_stop_id"}
    ], optional: true}],
    ["calendar", "trips", {dependencies: [
      {"trips" => "service_id", "calendar" => "service_id"}
    ]}],
    ["calendar_dates", "trips", {dependencies: [
      {"trips" => "service_id", "calendar_dates" => "service_id"}
    ]}],
    ["shapes", "trips", {dependencies: [
      {"trips" => "shape_id", "shapes" => "shape_id", :allow_null => true}
    ]}],
    ["trips", "frequencies", {dependencies: [
      {"trips" => "trip_id", "frequencies" => "trip_id"}
    ], optional: true}],

    # --- GTFS Extensions ---
    ["stops", "fare_leg_join_rules",
      {dependencies: [
        {"stops" => "stop_id", "fare_leg_join_rules" => "from_stop_id"},
        {"stops" => "stop_id", "fare_leg_join_rules" => "to_stop_id"}
      ]}],
    ["networks", "fare_leg_join_rules", {dependencies: [
      {"fare_leg_join_rules" => "from_network_id", "networks" => "network_id"},
      {"fare_leg_join_rules" => "to_network_id", "networks" => "network_id"}
    ]}],
    ["fare_leg_rules", "fare_leg_join_rules",
      {dependencies: [
        {"fare_leg_join_rules" => "fare_leg_rule_id", "fare_leg_rules" => "fare_leg_rule_id"}
      ]}],
    ["fare_transfer_rules", "fare_leg_rules",
      {dependencies: [
        {"fare_transfer_rules" => "from_leg_group_id", "fare_leg_rules" => "leg_group_id"},
        {"fare_transfer_rules" => "to_leg_group_id", "fare_leg_rules" => "leg_group_id"}
      ]}],
    ["fare_products", "fare_transfer_rules",
      {dependencies: [
        {"fare_transfer_rules" => "fare_product_id", "fare_products" => "fare_product_id"}
      ]}],
    ["areas", "stop_areas", {dependencies: [
      {"areas" => "area_id", "stop_areas" => "area_id"}
    ]}],
    ["areas", "stops", {dependencies: [
      {"stops" => "area_id", "areas" => "area_id"}
    ]}],
    ["areas", "fare_leg_rules", {dependencies: [
      {"areas" => "area_id", "fare_leg_rules" => "from_area_id"},
      {"areas" => "area_id", "fare_leg_rules" => "to_area_id"}
    ]}],
    ["networks", "route_networks", {dependencies: [
      {"networks" => "network_id", "route_networks" => "network_id"}
    ]}],
    ["networks", "routes", {dependencies: [
      {"networks" => "network_id", "routes" => "network_id"}
    ]}],
    ["networks", "fare_leg_rules", {dependencies: [
      {"networks" => "network_id", "fare_leg_rules" => "network_id"}
    ]}],
    ["routes", "route_networks", {dependencies: [
      {"route_networks" => "route_id", "routes" => "route_id"}
    ]}],
    ["networks", "route_networks", {dependencies: [
      {"route_networks" => "network_id", "networks" => "network_id"}
    ]}],
    ["location_groups", "location_group_stops", {dependencies: [
      {"location_groups" => "location_group_id", "location_group_stops" => "location_group_id"}
    ]}],
    ["location_groups", "stops", {dependencies: [
      {"location_groups" => "location_group_id", "stops" => "location_group_id"}
    ]}],
    ["stops", "location_group_stops", {dependencies: [
      {"location_group_stops" => "stop_id", "stops" => "stop_id"}
    ]}],
    ["stops", "location_group_stops", {dependencies: [
      {"stops" => "stop_id", "location_group_stops" => "stop_id"}
    ]}],
    ["location_groups", "location_group_stops", {dependencies: [
      {"location_group_stops" => "location_group_id", "location_groups" => "location_group_id"}
    ]}],
    ["booking_rules", "stop_times", {dependencies: [
      {"booking_rules" => "booking_rule_id", "stop_times" => "pickup_booking_rule_id"},
      {"booking_rules" => "booking_rule_id", "stop_times" => "drop_off_booking_rule_id"}
    ]}]
  ]

  edges.each do |from, to, attrs|
    g.add_edge(from, to, **attrs)
    if bidirectional
      # When adding the reverse edge, if the relationship is optional (child is not required),
      # mark the reverse edge as weak. This prevents empty child tables (e.g. fare_rules)
      # from filtering parent tables (e.g. routes) into emptiness.
      reverse_attrs = attrs.dup
      if attrs[:optional]
        reverse_attrs[:type] = :weak
      end
      g.add_edge(to, from, **reverse_attrs)
    end
  end
  g
end