constraints: Create field constraints

In ezwelty/dpkg: Data Packages for R

Description

A list of constraints for validating field values.

Usage

constraints(required = NULL, unique = NULL, minLength = NULL,
  maxLength = NULL, minimum = NULL, maximum = NULL, pattern = NULL,
  enum = NULL)

Arguments

required	(logical) Whether field cannot contain NA.
unique	(logical) Whether field values must be unique.
minLength	(integer) Minimum length of field values.
maxLength	(integer) Maximum length of field values.
minimum	Minimum value (of same type as field).
maximum	Maximum value (of same type as field).
pattern	(character) Regular expression field values must match (see https://www.w3.org/TR/xmlschema-2/#regexs).
enum	(vector) Allowed values.

References

https://specs.frictionlessdata.io/table-schema/#constraints

See Also

Other meta objects: contributor, field, foreignKey, package, resource, schema, source

Examples

constraints(
  required = TRUE,
  unique = TRUE,
  minimum = "1970-01-01",
  pattern = "[0-9]{4}-[0-9]{2}-[0-9]{2}"
)

ezwelty/dpkg documentation built on May 30, 2019, 7:19 a.m.