How to search in rails 7 with ransack when action text rich text using in the Post model?

Could somebody help me to figure out why it is not working?So what is the story: there is a rails 7 (7.1.3) blog app with a ransack version 4.1.1

In the search form, I need to search text by the post title and by the post bodyand I get this error

undefined method `type' for nil:NilClass

in the params I can see this

Parameters:

{"q"=>{"title_or_body_cont"=>"should"}, "commit"=>"Search"}

When I am trying to search only with a title like title_cont everything is ok, but when searching with body_cont or title_or_body_cont get the mentioned error. I think that is because the Post model does not have a body field and this field is in the action_text_rich_texts table. And after adding an association on the action_text_rich_texts table in the Post model I still have the mentioned error. I would appreciate for your help.

and my code

class Post < ApplicationRecord  has_rich_text :body  has_many :comments, dependent: :destroy  belongs_to :user  has_one_attached :post_image  validates :title, presence: { message: 'must be given please' }, length: { minimum: 5 }  validates :body, presence: true, length: { minimum: 10 }  validate :post_body_length  validate :acceptable_image  def self.ransackable_attributes(_auth_object = nil)    %w[title body created_at updated_at user_id]  end  def self.ransackable_associations(_auth_object = nil)    %w[users action_text_rich_texts]  end  private  def acceptable_image    return unless post_image.attached?    errors.add(:post_image, 'is too big') unless post_image.blob.byte_size <= 5.megabyte    acceptable_types = ['image/jpeg', 'image/png']    return if acceptable_types.include?(post_image.content_type)    errors.add(:post_image, 'must be a JPEG or PNG')  end  def post_body_cant_be_empty    if self.body.blank?      self.errors.add(:body, "can't be empty")    end  end  def post_body_length    if self.body.to_plain_text.length < 10      self.errors.add(:body, 'is too short (minimum is 10 characters)')    end  endend

also, there is a searches_controller

class SearchesController < ApplicationController  def index    @query = Post.ransack(params[:q])    @posts = @query.result.includes(:rich_text_body)  endend

and a search_form

<%= search_form_for @query, url: searches_path, method: :get, html: { class: "d-flex", role: "search" } do |f| %><%= f.search_field :title_or_body_cont, class: "form-control me-2", placeholder: "Search title or body..." %><%= f.submit "Search", class: "btn btn-outline-secondary-light btn-sm" %><% end %>

and routes

resources :searches, only: %i[index]

Post table structure

 create_table "posts", force: :cascade do |t|    t.string "title", null: false    t.datetime "created_at", null: false    t.datetime "updated_at", null: false    t.bigint "user_id", null: false    t.index ["user_id"], name: "index_posts_on_user_id"  end

Action_text_rich_texts table structure

create_table "action_text_rich_texts", force: :cascade do |t|    t.string "name", null: false    t.text "body"    t.string "record_type", null: false    t.bigint "record_id", null: false    t.datetime "created_at", null: false    t.datetime "updated_at", null: false    t.index ["record_type", "record_id", "name"], name: "index_action_text_rich_texts_uniqueness", unique: true  end