ruby - How do I add an Rails form helper HTML attribute that does not contain a quoted value? -

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For example, "required."

Thus presses the tracks with any attempts to add the attribute: 

  & lt;% = f.email_field: email ,: "ng-model "= & Gt; "Whatever" ,: class => "Form-control input-LG" ,: "required"%>

Just use Boolean values: 

  & Lt; % = F.email_field: email ,: "ng-model" = & gt; "Whatever" ,: class => "Form-Control Input-LG" ,: "Required" = & gt; True% & gt;

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