[SOLVED] Using the `validate` package inside an Rmarkdown document

Using the `validate` package inside an Rmarkdown document

I wish to include same validations inside my Rmarkdown report. Here is a minimal example:

---
title: "My Report"
output:
  html_document:
    mode: selfcontained
    theme: null
---

```{r, echo=FALSE}
library(validate)
rules <- validator(
    "Species" %in% names(.),
    is.character(Species),
    !is.na(Species)
)
chk <- confront(dat=iris, x=rules)
summary(chk)
```

I would expect a data.frame as the result, but I get (when I call rmarkdown::render on a file with the content above):

##     Length      Class       Mode 
##          3 validation         S4

It seems that the S4 summary method is not called correctly. I tried to call validate::summary.validations but that did not help.

Any ideas how to call summary from inside an rmarkdown document?

Solution

The summary.validations() function isn't exported from the namespace, so you'd have to use validate:::summary.validations(chk), but when I tried that, I got NULL as the output. However, when I used validate::summary(chk), I got the intended answer. (R v4.3.2, validate v1.1.3, rmarkdown v2.25, macOS 13.6)