Ruby on Rails

These two functions below work perfectly for end to end normal user
interaction. But, I need help giving line 2 of the code "recipients =
User.where(id: params['recipients']) multiple user support. As in allow
User model to interact with BizUser model.

def create
recipients = User.where(id: params['recipients'])
conversation = current_user.send_message(recipients,
params[:message][:body], params[:message][:subject]).conversation
flash[:success] = "Message has been sent!"
redirect_to conversation_path(conversation)
end

def recipients_options
s = ''
User.all.each do |user|
s << "<option value='#{user.id}'
data-img-src='#{gravatar_image_url(user.email, size:
50)}'>#{user.name}</option>"
end
s.html_safe
end

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