Rubyonrails 如何让空白复选框作为假传递给参数

我有一个表单，它是一个更新用户表单，其中有几个元素是复选框.如果选中，我希望true传递给params(这起作用)，如果未选中，则希望false传递给params(不起作用).未判断的项目甚至没有被发送到参数.如何使未判断的项目作为false通过？

类型

<%= form_tag user_url(@user), class: "form-signin", method: 'patch' do %>
 <h4>Please confirm your email.  We'll only email you if you have notifications.</h4>
  <%= email_field_tag :email, current_user.email %>
 <h4>Want to be notified when someone needs a player?  Choose which sports below.</h4>
  <%= check_box_tag :basketball, checked = true %> Basketball</br></br>
  <%= check_box_tag :indoor_volleyball, checked = true %> Indoor Volleyball</br></br>
  <%= check_box_tag :beach_volleyball, checked = true %> Beach Volleyball</br></br>
  <%= check_box_tag :soccer, checked = true %> Soccer</br></br>
  <%= check_box_tag :flag_football, checked = true %> Flag Football</br></br>
  <%= check_box_tag :hockey, checked = true %> Hockey</br></br>
  <%= check_box_tag :kickball, checked = true %> Kickball</br></br>
  <%= check_box_tag :softball, checked = true %> Softball
  <%= hidden_field_tag :user_id, :value => current_user.id %>
  <%= hidden_field_tag :user, :value => current_user %>
 <div>
  </br>
  <%= submit_tag "Submit", class:"btn btn-large btn-success" %>
 </div>

控制器

  def update
   respond_to do |format|
   if @user.update(update_params)
     format.html { redirect_to @user, notice: 'Updates were successful.' }
     format.json { head :no_content }
    else
     format.html { render action: 'edit' }
     format.json { render json: @user.errors, status: :unprocessable_entity }
    end
   end
  end

  def update_params
    params.permit(:email, :soccer, :softball, :beach_volleyball, :indoor_volleyball, :flag_football, :basketball, :hockey, :kickball)
  end