[Solved] Rails how to render array field in template use form_builder?

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I have found the solution by setting :multiple => true, which will give the right result.

<%= f.hidden_field :location, :multiple => true, :id => "foo_location_1" %>
<%= f.hidden_field :location, :multiple => true, :id => "foo_location_2" %>

solved Rails how to render array field in template use form_builder?