ruby on rails - How can I Make multi select in simple_fields_for -

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I've written the following to accept roles, how many values ​​can it be accepted 

  = f.simple_fields_for: content_roles | Role | "Role", collection: rolls all, required: true    
 
 
 just your role area Add  multiple: true  to  
 Like this:  
 = role.input: role_id, label: "visible to", like: select, label: "role", compile: roll .all, required: true, multiple: correct

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