Comment với ajax trong rails

Lại phải cần sự giúp đỡ của mọi người. Mình làm chức năng comment sử dụng ajax. Hiện đang lỗi edit. Log của file như này:

Link git của nhánh: https://github.com/BlazingRockStorm/let-us-go/tree/comment-policy Mọi người giúp đỡ với Đây là file

class CommentsController < ApplicationController
  before_action :set_comment, only: [:show, :edit, :update, :destroy]
  after_action :verify_authorized, only: [:destroy]

  # GET /comments
  # GET /comments.json
  def index
    @comments = Comment.all
  end

  # GET /comments/1
  # GET /comments/1.json
  def show
  end

  # GET /comments/new
  def new
    @comment = Comment.new
  end

  # GET /comments/1/edit
  def edit
    # authorize User
    respond_to do |format|          
      format.js {}
    end
  end

  # POST /comments
  # POST /comments.json
  def create
    @comment = Comment.new(comment_params)

    respond_to do |format|
      if @comment.save
        format.html { redirect_to event_path @comment.event, notice: 'Comment was successfully created.' }
        format.js {}
      else
        format.html { render :new }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end

    @comment.save
  end

  # PATCH/PUT /comments/1
  # PATCH/PUT /comments/1.json
  def update
    respond_to do |format|
      if @comment.update(comment_params)
        # format.html { redirect_to event_path @comment.event, notice: 'Comment was successfully updated.' }
        format.js {}
      else
        # format.html { render :edit }
        format.js {}
      end
    end
  end

  # DELETE /comments/1
  # DELETE /comments/1.json
  def destroy
    authorize @comment
    @comment.destroy
    respond_to do |format|
      format.html { redirect_to event_path @comment.event }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_comment
      @comment = Comment.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def comment_params
      params.require(:comment).permit(:user_id, :event_id, :content, :image)
    end
end

routes.rb

resources :events do
    resources :comments
  end

events/show.html.erb

<% if user_signed_in? %>
        <% if current_user.admin? %>
          <%= link_to 'Edit', edit_event_path(@event), :remote => true, :class => "btn btn-primary" %> 
          <%= link_to 'Back', "javascript: history.go(-1)", :class => "btn btn-secondary" %>
        <% else %>

          <%= link_to 'Join', "javascript:void(0)", :class => "btn btn-primary" %> 
          <%= link_to 'Back', "javascript: history.go(-1)", :class => "btn btn-secondary" %>
          <div class="comment-form">
            <%= render partial: "comments/form", locals: { event: @event, comment: @comment } %>
          </div>

        <% end %>
      <% else %>
        <p>Sign in to comment</p>
      <% end %>
      <div class="comments-list">
        <%= render partial: "comments/index",  collection: @event.comments, as: "comment" %>
      </div>

comments/_index.html.erb

<div class="row" id='comment_<%= comment.id %>'>
  <div class="col-md-1"><%= comment.user.name %></div>
  <div class="col-md-6"><%= comment.content %></div>
  <% if user_signed_in? && current_user == comment.user %>  
    <div class="col-md-1">
      <%= link_to 'Edit', edit_event_comment_path(comment.event, comment), class: "btn btn-link", remote: true %>
    </div>
    <div class="col-md-1">
      <%= link_to 'Delete', event_comment_path(comment.event, comment), method: :delete, data: { confirm: 'Are you sure?' }, class: "btn btn-link" %>
    </div>
  <% end %>
</div>

comments/edit.erb.js

$('.comment-form').html("<%= j (render 'comments/form', locals: { event: @event, comment: @comment }) %>");
$('.comment-box').focus();
$('.comment-box').val('.comment-box').val("<%= @comment.content %>");

comments/update.erb.js

$('.comment-form').html("<%= escape_javascript( render partial: "comments/form", 
    locals: { event: @event, comment: @comment } ) %>")
$('.comment-box').val('.comment-box').val('');
$('.comment-box').focus();
$('.comments-list').html('<%= j render "comments/index",
    comments: @event.comments.desc %>').appendTo('.comment-list');

comments/_form.html.erb

<%= form_for [event, comment], html: {class: "form-inline"} do |form| %>
  <% if comment.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(comment.errors.count, "error") %> prohibited this comment from being saved:</h2>

      <ul>
      <% comment.errors.full_messages.each do |message| %>
        <li><%= message %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="form-group" style="width:100%">
      <%= form.hidden_field :user_id, value: current_user.id %>
      <%= form.hidden_field :event_id, value: event.id %>
      <%= form.text_area :content, rows: 1, :class => "comment-box form-control", :style=>"width:50%",
          :required => true, :autocomplete => 'off', placeholder: "Comment" %>
          
      <%= form.submit "Comment", id: "reply_submit", class: "btn btn-primary" %>
  </div>

<% end %>