Require a data frame from a module's data reactive

Wraps the data reactive every module server receives so that downstream readers always see a data frame. A NULL value (which a parent app can emit briefly while switching datasets) becomes a silent shiny::req() skip rather than an error cascade through every observer, and anything else is coerced with as.data.frame() before use.

Usage

require_data_frame(data)

Arguments

data

A reactive returning a data frame or an object coercible to one.

Value

A reactive returning a data frame with at least one column.

Author

Jared Andrews

Examples

if (FALSE) { # \dontrun{
# First line of a module server, before anything reads `data()`:
data <- require_data_frame(data)
} # }