実現したいこと

FormObjectでvalidatesメソッドが機能すること
次のテストがパスすること

ActiveModel::Modelをincludeしたのですが、何故かvalidatesメソッドが機能していません。

コードはこちらです。

Model

ruby
1class Article < ApplicationRecord
2  belongs_to :user
3  has_many :pictures, dependent: :destroy
4end
5
6class Picture < ApplicationRecord
7  belongs_to :article
8
9  mount_uploader :image, PictureUploader
10end

Controller

ruby
1class ArticlesController < ApplicationController
2  def create
3    @article = ArticleForm.new(article_params.merge(user_id: current_user.id)
4    if @article.save
5      redirect_to root_url
6    else
7      render :new
8  end
9
10  private
11    def article_params
12      params.require(:article_form).permit(
13        :title, 
14        :content, 
15        pictures_attributes: [:image]   
16      )
17    end
18end

FormObject

ruby
1class ArticleForm
2  include ActiveModel::Model
3
4  attr_accessor :title, :content, :user_id, :pictures_attributes
5
6  validates :title, presence: true
7  validates :content, presence: true
8
9  def save
10    return false if invalid?
11
12    article.assign_attributes(article_params)
13    build_association if pictures_attributes.present?
14
15    if article.save
16      true
17    else
18      false
19    end
20  end
21
22  private
23    def article
24      @article ||= Article.new
25    end
26
27    def build_association
28      pictures_attributes.each_value do |picture|
29        article.pictures << Picture.new(image: picture[:image])
30      end
31    end
32  
33    def article_params
34      {
35        title: title,
36        content: content,
37        user_id: user_id
38      }
39    end
40end

RSpec

ruby
1require "rails_helper"
2
3RSpec.describe ArticleForm do
4  let(:user) { FactoryBot.create(:alice) }
5  
6  describe "#validates" do
7    let(:user) { FactoryBot.create(:alice) }
8    let(:valid_params) { FactoryBot.attributes_for(:alice_article) }
9    let(:article) { described_class.new(valid_params.merge(user_id: user.id)) }
10
11    subject { article.invalid? }
12
13    context "投稿が無効な時" do
14      it "titleが空白の場合無効であること" do
15        article.title = ""
16        expect(subject).to be_truthy
17      end
18
19      it "contentが空白の場合無効であること" do
20        article.content = ""
21        expect(subject).to be_truthy
22      end
23    end
24  end
25end