Trix rich_text_area form field doesn't clear on submit when containing an image

[fugee ohu]

If this form contains an image the rich_text_area field doesn't clear because I'm calling    

ActionCable.server.broadcast 'room_channel', content: @message.content, msg_time: Time.now, recipients: @message.recipients, sender: @message.sender, sender_name: User.find(@message.sender).name

<%= form_with model: @message, multipart: true, remote: true do |f| %>

    <%= f.rich_text_area :content, class: 'form-control' %>
    <%= f.hidden_field :recipients, value: @conversation_with.id %>
    <%= f.hidden_field :sender, value: current_user.id %>
    <%= f.submit 'Send' %>
<% end %>