emitted_hidden_id?() public

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February 8, 2013 - (>= v2.3.8)
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The purpose of this method

This method keeps track of whether a hidden id field needs to be created when the form builder is generating fields for a nested model. It gets set to true by #hidden_field when that method is used to create a field named ‘id’.

Here’s an example of what this can be useful for: http://railsforum.com/viewtopic.php?id=39640