Ruby on Rails: Checkbox gets unchecked when trying to edit a post

When i create a new post (passengerride), it is successfully storing multiple value in database. But, when i try to edit the post (passengerride), the checkboxes are getting unchecked.

This is my form:

apps/views/passengerrides/_form.html.erb:

<%= form_for @passengerride do |f| %>
        ......
          <div class="form-group ">
            <div class="control-label col-sm-2 requiredField">
              <%= f.label :okwithgender, 'Driver should be:' %>
              <span class="asteriskField">*</span>
            </div>

            <div class="col-sm-8">
              <div class=" ">
                <div class="checkbox">

                  <label class="checkbox"><input id="okwithgender"  type="checkbox" value="Male" name="passengerride[okwithgender][]">Male</label>

                </div>
                <div class="checkbox">

                  <label class="checkbox"><input id="okwithgender"  type="checkbox" value="Female" name="passengerride[okwithgender][]">Female</label>

                </div>
                <div class="checkbox">

                  <label class="checkbox"><input id="okwithgender"  type="checkbox" value="Other" name="passengerride[okwithgender][]">Other</label>

                </div>
                <div class="checkbox">

                  <label class="checkbox"><input id="okwithgender"  type="checkbox" value="Any Gender" name="passengerride[okwithgender][]">Any Gender</label>

                </div>
              </div>
            </div>
          </div>

   ....
<% end %>

app/controllers/passengerrides_controllers:

  def passengerride_params
      params[:passengerride][:okwithgender] = params[:passengerride][:okwithgender].join(', ')
      params.require(:passengerride).permit(:origin, :destination ... :okwithgender)
  end

I guess using this <%= f.check_box ... %> will solve the problem, but i'm not sure how to write something equivalent to <input id="okwithgender" type="checkbox" value="Male" name="passengerride[okwithgender][]">