requireを設定するとエラーが出る

前提

コントローラーでrequireを設定するとエラーが出ます。

実現したいこと

投稿した画像にタグ付けをしたいです。

発生している問題・エラーメッセージ

ActionController::ParameterMissing in DesignsController#create param is missing or the value is empty: post_form

該当のソースコード

ruby

1[app>controllers>designs_controller.rb]2 3class DesignsController < ApplicationController4 before_action :authenticate_user!, only:[:edit, :new, :destroy]5 before_action :move_to_index, except: [:index, :show]6 before_action :set_design, only: [:show, :edit]7 8 def index9 @designs = Design.includes(:user).order("created_at DESC")10 end11 12 def new13 @designs = Design.new14 end15 16 def create17 @designs = Design.create(design_params)18 if 19 @designs.save 20 redirect_to root_path 21 else22 render :new23 end24 end25 26 def show27 28 end29 30 def destroy31 design = Design.find(params[:id])32 if design.destroy 33 redirect_to root_path 34 end35 end36 37 def update38 design = Design.find(params[:id])39 if40 design.update(design_params)41 redirect_to design_path(design.id)42 else43 redirect_to request.referer 44 end45 end46 47 def edit48 unless user_signed_in? && current_user.id == @design.user_id 49 redirect_to action: :index50 end51 end52 53 def search54 @designs = Design.search(params[:keyword]).order("created_at DESC")55 end56 57 private58 59 def design_params60 params.require(:post_form).permit(:title, :file_name, :image).merge(user_id: current_user.id)61 end62 63 def set_design64 @design = Design.find(params[:id])65 end66 67 def move_to_index68 unless user_signed_in?69 redirect_to action: :index70 end71 end72 73end

ruby

1[app>models>post_form.rb]2 3class PostForm4 include ActiveModel::Model5 6 attr_accessor(7 :title, :file_name, :image,8 :id, :created_at, :updated_at,9 :tag_name10 )11 12 with_options presence: true do13 validates :title14 validates :file_name15 validates :image16 end17 18 def save19 designs = Design.create(text: text, image: image)20 tag = Tag.where(tag_name: tag_name).first_or_initialize 21 tag.save 22 PostTagRelation.create(design_id: design.id, tag_id: tag.id)23 end24

ruby

1[app>models>post_tag_relation.rb]2class PostTagRelation < ApplicationRecord3 belongs_to :design4 belongs_to :tag5end

ruby

1[app>models>design.rb]2 3class Design < ApplicationRecord4 belongs_to :user5 has_many :post_tag_relations6 has_many :tags, through: :post_tag_relations7 has_one_attached :image8 9 validates :title, presence: true10 validates :file_name, presence: true11 validates :image, presence: true12 13 def self.search(search)14 if search != ""15 Design.where('title LIKE(?)', "%#{search}%")16 else17 Design.all 18 end19 end20 21 22 23end

ruby

1[app>views>show.html.erb]2 3<main class="main">4 <div class="inner">5 <div class="prototype__wrapper">6 <p class="prototype__hedding">7 <%= @design.title %> 8 </p> 9 <% if user_signed_in? && current_user.id == @design.user_id %> 10 <div class="prototype__detail"><br>11 <p class="detail__title">ファイル場所</p>12 <p class="detail__message">13 <%= @design.file_name %> 14 </p> 15 </div> 16 <% end %> 17 18 <span class="tag_style"><%= @design.tags.first&.tag_name %></span> 19 20 <div class="prototype__image">21 <%= image_tag @design.image %> 22 </div>23 </div>24 </div>25</main>

ruby

1[app>views>designs>_form.html.erb]2<%= form_with model: @design, url: url, method: method, id: 'new_post', local: true do |f| %> 3 4 <div class="field">5 <%= f.label :title, "タイトル" %><br /> 6 <%= f.text_field :title, id:"design_title" %> 7 </div>8 9 <div class="field">10 <%= f.label :file_name, "ファイル名" %><br /> 11 <%= f.text_area :file_name, class: :form__text, id:"design_file_name" %> 12 </div>13 14 <div class="field">15 <%= f.label :image, "画像" %><br /> 16 <%= f.file_field :image, id:"design_image" %> 17 </div>18 19 <div class="tag-field">20 <%= f.text_field :tag_name, placeholder: 'add tags' %> 21 </div> 22 23 <div class="actions">24 <%= f.submit "保存する", class: :form__btn %> 25 </div>26<% end %>

試したこと

requireを削除すると正常に表示されるのですが
今度はタグの保存・表示ができなくなります。

補足情報（FW/ツールのバージョンなど）

初心者でして、初歩的な質問かと思いますが、何卒宜しくお願いいたします。