Unable to autoload constant controller and Uncaught SyntaxError: Unexpected token., compile error during ajax asynchronous communication

def create
  @[email protected](message_params)
  [email protected]
    response_to do | format |
      format.html {redirect_to group_messages_path(@group)}
      format.json
  else
    @[email protected](:user)
    flash.now [:alert] = "Please enter a message"
    render —index
  end
end

$(function(){
  function buildHTML(data){
    var Image=';

    if(passage.image){
      Image=`<img src=${message.image} class=`lower-message__image`>`
    }

    varhtml=`<div class="message" data-message-id=${message.id}>
                  <div class="upper-message">
                    <div class="upper-message__user-name">
                      ${ message.name}
                    </div>
                    <div class="upper-message__date">
                      ${ message.data}
                    </div>
                  </div>
                  <div class="lower-mesage">
                      <p class="lower-message__content">
                        ${ message.text}
                      </p>
                        $ {Image}
                  </div>
                </div>`;
    return html;
  }

  $("#new_message").on('submit', function(e){// When you submit the form
    console.log("this")
    e.preventDefault();// Stop the action and stop the page transition
    var formData = new FormData(this); // Get form information
    var url = $(this).attr("action");
    $.ajax({
      type: "POST",
      url —url,
      data —FormData,
      dataType: "json",
      processData: false,
      contentType:false
    });
    .done(function(data){
      var html = buildHTML(data);
      var url = $(this).attr("action");
      $('.message') .append(html);
    })
    .fail(function(){
      alert('error');
    });
    return false;
  });
});

json.id@m essage.id
[email protected]
[email protected]
[email protected]_at.strftime('%Y/%m/%d%H:%M:%S')
json.name@m essage.user.name