model_auto_completer is a Rails plugin that provides autocompletion for models. That is, the user autocompletes a text field, but the widget is able to manage a hidden field that stores the ID of the model that corresponds to the selected completion.
Such a widget may be useful when the number of options is too much for a select. Say you need to assign a director to a movie having a database of hundreds of directors. With this plugin it is easy to let the user autocomplete by director name, and have a robust database ID managed under the hood.
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