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Autocomplete should include methods defined in your project.
I agree - it should, and as far as I know, it does. Do you have a reproducible scenario to share? (Marking INCOMPLETE to indicate to the bug dashboard that this issue is waiting for additional submitter info)
The real problem is that currently autocomplete does not do any kind of filtering on the autocomplete and if you have lots of gems installed you not be able to use it anymore.
when in a rhtml file of a view, the auto-complete does not suggest the methods from the related helper, or from the application helper.