Substitute values into expression, thereby simplifying the rule set. Rules that evaluate to TRUE because of the substitution are removed.
substitute_values(.x, .values = list(...), ..., .add_constraints = TRUE)validator object with rules
(optional) named list with values for variables to substitute
alternative way of supplying values for variables (see examples).
logical, should values be added as constraints to the resulting validator object?
library(validate)
rules <- validator( rule1 = z > 1
, rule2 = y > z
)
# rule1 is dropped, since it always is true
substitute_values(rules, list(z=2))
#> Object of class 'validator' with 2 elements:
#> rule2 : y > 2
#> .const_z: z == 2
# you can also supply the values as separate parameters
substitute_values(rules, z = 2)
#> Object of class 'validator' with 2 elements:
#> rule2 : y > 2
#> .const_z: z == 2
# you can choose to not add substituted values as a constraint
substitute_values(rules, z = 2, .add_constraints = FALSE)
#> Object of class 'validator' with 1 elements:
#> rule2: y > 2
rules <- validator( rule1 = if (gender == "male") age >= 18 )
substitute_values(rules, gender="male")
#> Object of class 'validator' with 2 elements:
#> rule1 : age >= 18
#> .const_gender: gender == "male"
substitute_values(rules, gender="female")
#> Object of class 'validator' with 1 elements:
#> .const_gender: gender == "female"