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Example:
@models = Model.all select_tag "models", options_from_collection_for_select(@models, "id", "name"), {}
This will generate the following HTML: David
The last argument are options, which accepts the following: { multiple: false, disabled: false, include_blank: false, prompt: false }
More examples can be found:http://apidock.com/rails/ActionView/Helpers/FormTagHelper/select_tag