check_field_exists: Check the existence of fields in a GTFS object element

In gtfsio: Read and Write General Transit Feed Specification (GTFS) Files

Check the existence of fields in a GTFS object element

Description

Checks the existence of fields, represented by columns, inside a GTFS object element.

Usage

check_field_exists(x, file, fields)

assert_field_exists(x, file, fields)

Arguments

x	A GTFS object.
file	A string. The element, that represents a GTFS text file, where fields should be searched.
fields	A character vector. The fields to check the existence of.

Value

check_field_exists returns TRUE if the check is successful, and FALSE otherwise.
assert_field_exists returns x invisibly if the check is successful, and throws an error otherwise.

See Also

Other checking functions: check_field_class(), check_file_exists()

Examples

gtfs_path <- system.file("extdata/ggl_gtfs.zip", package = "gtfsio")
gtfs <- import_gtfs(gtfs_path)

check_field_exists(gtfs, "calendar", c("monday", "tuesday"))

check_field_exists(gtfs, "calendar", c("monday", "oi"))

gtfsio documentation built on Oct. 20, 2023, 9:08 a.m.