#424

backend/spec/models/shared_tag_ids_spec.rb

@@ -0,0 +1,73 @@
+require 'rails_helper'
+
+RSpec.describe 'Shared Tag and ExternalTag IDs', type: :model do
+  include TagGroupRecords
+
+  def create_resource resource
+    if resource == :tag
+      Tag.find_or_create_by_tag_name!(Locale.nipponese, 'shared_id_new', category: :general)
+    else
+      ExternalTag.create!(platform: :nico, name: 'shared_id_new')
+    end
+  end
+
+  [:tag, :external_tag].each do |resource|
+    it "starts #{ resource } at 1 when both tables are empty" do
+      expect(Tag.count).to eq(0)
+      expect(ExternalTag.count).to eq(0)
+      expect(create_resource(resource).id).to eq(1)
+    end
+
+    it "allocates #{ resource } above the other table's maximum" do
+      create(:tag, id: resource == :tag ? 1 : 20)
+      create(:external_tag, id: resource == :external_tag ? 1 : 20)
+
+      expect(create_resource(resource).id).to eq(21)
+    end
+
+    it "preserves legacy overlaps and gaps when creating #{ resource }" do
+      [1, 2, 5].each { create(:tag, id: _1) }
+      [1, 3, 8].each { create(:external_tag, id: _1) }
+      tags = Tag.order(:id).map(&:attributes)
+      external_tags = ExternalTag.order(:id).map(&:attributes)
+
+      record = create_resource(resource)
+
+      aggregate_failures do
+        expect(record.id).to eq(9)
+        expect(Tag.where(id: [1, 2, 5]).order(:id).map(&:attributes)).to eq(tags)
+        expect(ExternalTag.where(id: [1, 3, 8]).order(:id).map(&:attributes)).to eq(external_tags)
+        expect(Tag.exists?(id: 3)).to be(false)
+        expect(ExternalTag.exists?(id: 2)).to be(false)
+      end
+    end
+
+    it "ignores the description and group ID space when creating #{ resource }" do
+      tag = create(:tag, id: 1)
+      create(:external_tag, id: 2)
+      TagDescription.create!(id: 100, tag:, language_code: 'ja', body: '', version_no: 1)
+      seed_group(name: 'separate_space', id: 200)
+
+      expect(create_resource(resource).id).to eq(3)
+    end
+  end
+
+  it 'preserves overlapping IDs during updates without rewriting the other resource' do
+    tag = create(:tag, id: 5)
+    external = create(:external_tag, id: 5)
+    tag.update!(category: :meta)
+    external.update!(name: 'updated_external')
+
+    expect(tag.reload.id).to eq(5)
+    expect(external.reload.id).to eq(5)
+    expect(tag.category).to eq('meta')
+    expect(external.name).to eq('updated_external')
+    expect(Tag.count).to eq(1)
+    expect(ExternalTag.count).to eq(1)
+  end
+
+  it 'allocates distinct IDs for successive creations across both tables' do
+    records = [:tag, :external_tag].map { create_resource(_1) }
+    expect(records.map(&:id)).to eq([1, 2])
+  end
+end