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Normalize a module's "no selection" column input to NULL

Source: R/parse_utils.R
blank_to_null.Rd

Module selects use "" for "none". Statistics helpers expect NULL, and a grouping column that is numeric is a gradient rather than a nesting, which the renders already treat as no grouping.

Usage

blank_to_null(value, df = NULL, numeric_is_null = FALSE)

Arguments

value

The input value.

df

Optional data frame, needed only for numeric_is_null.

numeric_is_null

Logical; when TRUE, a numeric column in df also yields NULL.

Value

value, or NULL.

Details

Anything that is not a single, non-NA, non-empty value gives NULL: an input that has not reported yet (NULL), NA, "" and a vector of more than one value alike. A multi-select therefore reads as "no selection", so handle those inputs explicitly.

See also

nz_value(), na_to_null()

Author

Jared Andrews

Examples

blank_to_null("")
#> NULL
blank_to_null(NULL)
#> NULL
blank_to_null("Species")
#> [1] "Species"
blank_to_null("Sepal.Length", df = iris, numeric_is_null = TRUE)
#> NULL