【Ruby on Rails】コメント投稿時user_idが渡らない

class EventsController < ApplicationController
  before_action :authenticate_user!

  def index
    @events = current_user.events
  end

  def show
    @event = Event.find(params[:id])
    @comments = @event.comments
    @comment = current_user.comments.new
  end

  def new
    @event = Event.new
  end

  def create
    @event = Event.new(event_params)
    @event.user_id = current_user.id
    @event.save
    redirect_to events_path
  end

  def edit
    @event = Event.find(params[:id])
  end

  def update
    @event = Event.find(params[:id])
    @event.update
    redirect_to events_path
  end

  def destroy
    @event = Event.find(params[:id])
    @event.destroy
    redirect_to events_path, notice:"削除しました"
  end

  private

  def event_params
    params.require(:event).permit(:title, :overview, :start_time, :finish_time, :user_id)
  end

end

class CommentsController < ApplicationController

  def create
    @comment = Comment.new(comment_params)
    @comment.user_id = current_user.id
    if @comment.save
      redirect_back(fallback_location: root_path)
    else
      redirect_back(fallback_location: root_path)
    end

  end

  def destroy
    Comment.find_by(id: params[:id], event_id: params[:event_id]).destroy
    redirect_back(fallback_location: root_path)
  end

  private

  def comment_params
    params.require(:comment).permit(:body, :user_id, :event_id)
  end

  def event_params
    params.require(:event).permit(:title, :overview, :start_time, :finish_time, :user_id)
  end

end

--略--

<h2>コメント一覧</h2>
<% @comments.each do |c| %>
  <div>
    <a href="/users/<%= c.user.id %>"><%= c.user.full_name %></a>
    <%= c.body %>
    <hr>
  </div>
<% end %>

<%= form_with model: @comment, url: event_comments_path(@event), local: true do |f| %>
  <%= f.text_field :body %>
  <br>
  <%= f.submit 'コメントする' %>
<% end %>

class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable

  has_many :todos,              dependent: :destroy
  has_many :titles,             dependent: :destroy
  has_many :events,             dependent: :destroy
  has_many :relevant_parties,   dependent: :destroy
  has_many :comments,           dependent: :destroy
  has_many :okeys,              dependent: :destroy

  def already_okeyed?(event)
    self.okeys.exists?(event_id: event.id)
  end

  validates :encrypted_password,     presence: true, length: { minimum: 8 }
  validates :last_name,              presence: true, format: {with: /\A[ぁ-んァ-ン一-龥]/ }
  validates :last_name_kana,         presence: true, format: {with: /\A[ァ-ヶー－]+\z/ }
  validates :first_name,             presence: true, format: {with: /\A[ぁ-んァ-ン一-龥]/ }
  validates :first_name_kana,        presence: true, format: {with: /\A[ァ-ヶー－]+\z/ }
  validates :email,                  presence: true, format: {with: /\A\S+@\S+\.\S+\z/ }

  def full_name
    self.last_name + self.first_name
  end

end

class Event < ApplicationRecord
  belongs_to :user, dependent: :destroy
  has_many :event_todos, dependent: :destroy
  has_many :attachments, dependent: :destroy
  has_many :relevant_parties, dependent: :destroy
  has_many :okeys, dependent: :destroy
  has_many :okeyed_users, through: :okeys, source: :user
  has_many :comments, dependent: :destroy
end

class CreateComments < ActiveRecord::Migration[5.2]
  def change
    create_table :comments do |t|
      t.references :user, foreign_key: true
      t.references :event, foreign_key: true
      t.text :body, null: false
      t.timestamps
    end
  end
end

class CreateEvents < ActiveRecord::Migration[5.2]
  def change
    create_table :events do |t|
      t.references :user, foreign_key: true
      t.datetime :start_time, null: false
      t.datetime :finish_time, null: false
      t.string :title, null: false
      t.text :overview
      t.timestamps
    end
  end
end