投稿に対する履歴（#264） (#307)

Merge branch 'main' into feature/264

#264

#264

#264

#264

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #307

backend/spec/requests/posts_spec.rb

@@ -795,4 +795,127 @@ RSpec.describe 'Posts API', type: :request do
       expect(user.reload.viewed?(post_record)).to be(false)
     end
   end
+
+  describe 'post versioning' do
+    let(:member) { create(:user, :member) }
+
+    def snapshot_tags(post)
+      post.snapshot_tag_names.join(' ')
+    end
+
+    def create_post_version_for!(post)
+      PostVersion.create!(
+        post: post,
+        version_no: 1,
+        event_type: 'create',
+        title: post.title,
+        url: post.url,
+        thumbnail_base: post.thumbnail_base,
+        tags: snapshot_tags(post),
+        parent: post.parent,
+        original_created_from: post.original_created_from,
+        original_created_before: post.original_created_before,
+        created_at: post.created_at,
+        created_by_user: post.uploaded_user
+      )
+    end
+
+    it 'creates version 1 on POST /posts' do
+      sign_in_as(member)
+
+      expect do
+        post '/posts', params: {
+          title: 'versioned post',
+          url: 'https://example.com/versioned-post',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload
+        }
+      end.to change(PostVersion, :count).by(1)
+
+      expect(response).to have_http_status(:created)
+
+      created_post = Post.find(json.fetch('id'))
+      version = PostVersion.find_by!(post: created_post, version_no: 1)
+
+      expect(version.event_type).to eq('create')
+      expect(version.title).to eq('versioned post')
+      expect(version.url).to eq('https://example.com/versioned-post')
+      expect(version.created_by_user_id).to eq(member.id)
+      expect(version.tags).to eq(snapshot_tags(created_post))
+    end
+
+    it 'creates next version on PUT /posts/:id when snapshot changes' do
+      sign_in_as(member)
+      create_post_version_for!(post_record)
+
+      tag_name2 = TagName.create!(name: 'spec_tag_2')
+      Tag.create!(tag_name: tag_name2, category: :general)
+
+      expect do
+        put "/posts/#{post_record.id}", params: {
+          title: 'updated title',
+          tags: 'spec_tag_2'
+        }
+      end.to change(PostVersion, :count).by(1)
+
+      expect(response).to have_http_status(:ok)
+
+      version = post_record.reload.post_versions.order(:version_no).last
+      expect(version.version_no).to eq(2)
+      expect(version.event_type).to eq('update')
+      expect(version.title).to eq('updated title')
+      expect(version.created_by_user_id).to eq(member.id)
+      expect(version.tags).to eq(snapshot_tags(post_record.reload))
+    end
+
+    it 'does not create a new version on PUT /posts/:id when snapshot is unchanged' do
+      sign_in_as(member)
+      create_post_version_for!(post_record)
+
+      expect do
+        put "/posts/#{post_record.id}", params: {
+          title: post_record.title,
+          tags: 'spec_tag'
+        }
+      end.not_to change(PostVersion, :count)
+
+      expect(response).to have_http_status(:ok)
+
+      version = post_record.reload.post_versions.order(:version_no).last
+      expect(version.version_no).to eq(1)
+      expect(version.event_type).to eq('create')
+      expect(version.tags).to eq(snapshot_tags(post_record))
+    end
+
+    it 'does not create a version when POST /posts is invalid' do
+      sign_in_as(member)
+
+      expect do
+        post '/posts', params: {
+          title: 'invalid post',
+          url: 'ぼざクリタグ広場',
+          tags: 'spec_tag',
+          thumbnail: dummy_upload
+        }
+      end.not_to change(PostVersion, :count)
+
+      expect(response).to have_http_status(:unprocessable_entity)
+    end
+
+    it 'does not create a version when PUT /posts/:id is invalid' do
+      sign_in_as(member)
+      create_post_version_for!(post_record)
+
+      expect do
+        put "/posts/#{post_record.id}", params: {
+          title: 'updated title',
+          tags: 'spec_tag',
+          original_created_from: Time.zone.local(2020, 1, 2, 0, 0, 0).iso8601,
+          original_created_before: Time.zone.local(2020, 1, 1, 0, 0, 0).iso8601
+        }
+      end.not_to change(PostVersion, :count)
+
+      expect(response).to have_http_status(:unprocessable_entity)
+    end
+  end
 end