add_epred_draws does not show error when re_formula = includes non-existent terms

[mz555]

I was using tidybayes to plot some data from a brms model, and realised the figure looked off, but could not tell why, until I realised the term I provided in add_epred_draws for re_formula= was misspelt.

It would be good if the package threw an error message to alert the user to this issue.

Wrong code:
add_epred_draws(m1, re_formula = ~ (1 | item)) I used "item" with no capital. It showed no error when running the code, and only realised because my plot estimates were off.

Correct code:
add_epred_draws(m1, re_formula = ~ (1 | Item))

Wrong plot

Correct plot

[mjskay]

Yeah an error/warning here would be good. Can you check and see if you call the underlying brms function (brms::posterior_epred) no error/warning is generated? If that isn't generating a warning either then this is an issue for brms.