mutate works as expected in Shiny, but not rename or select when referencing a column

[pathos]

This works perfectly fine:
df |> mutate(abc = get(input$abc))
where input$abc is user selected column from df.

These do not:
df |> rename(abc = get(input$abc))
df |> select(-get(input$abc))

Why doesn't this work?

Solution (don't use get()):
df |> rename(abc = input$abc)

[nirgrahamuk]

It might be an accident. Do you have a variable in your global namespace that is a vector named the same as the content of the input?

What was your intent behind trying to use get()? How is it relevant for your task...

[pathos]

Do you have a variable in your global namespace that is a vector named the same as the content of the input?

No, it's cleared out (beforehand).

What was your intent behind trying to use get()? How is it relevant for your task...

In Shiny dashboard, I have to use get() in order to correctly call the columns within the df, which is a user-uploaded data.

[nirgrahamuk]

df <- iris
input <- list()
input$abc <-"Sepal.Length"

#rather than this
df %>% mutate(abc = get(input$abc))
#do this
df %>% mutate(abc = !!sym(input$abc))