:append and :prepend not applied to collection selects.

[lcreid]

If the user provides :append and :prepend options to select, the text/HTML will be appended or prepended to the control. If the user provides those options to collection_select or grouped_collection_select, they have no effect. I don't see why this should be inconsistent.

I'm not sure whether this is a bug or a feature request.

At ae08c5b (Feb 15, 2014), specifically ae08c5b#diff-d858d9de5eda99f11a7840b6c015c89eR8 and ae08c5b#diff-d858d9de5eda99f11a7840b6c015c89eR40, the handling of select and collection_select were moved out of the "generic" definition of the bootstrap_form helpers. In doing so, it looks like they both lost :append and :prepend.

It looks like it was fixed for select with PR #327 (Apr 24, 2017), but not for the other select methods.

[lcreid]

#327 (comment) says there was no reason why only select got :prepend and :append.

[donv]

Right, I added what I needed at the time.

[lcreid]

@donv no worries. I agree that it's best to do what you need and no more. I just wanted to make sure your comment was visible in this issue, too. Thanks very much for your support!

[lcreid]

The Bootstrap documentation for input groups implies that input groups can wrap input tags, custom selects, and custom file input, but not the browser default versions of selects and file inputs.