Rails 3 jquery autocomplete from a CSV file?

The biggest red flag here is that you're opening and parsing the CSV file on every request. That's an expensive operation and certainly not worth it. Autocomplete is essentially a search operation, and CSV files are not designed for searching.

You should parse the CSV file only when it is created or changed, then store its data in a structure (e.g. A database with good indices) designed for searching.

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