#428

backend/app/controllers/sitemap_entries_controller.rb

@@ -0,0 +1,57 @@
+class SitemapEntriesController < ApplicationController
+  PAGE_SIZE = 1_000
+  RESOURCES = [
+      'posts', 'tags', 'deerjikists', 'materials',
+      'descriptions', 'tag_groups', 'theatres'].freeze
+
+  def index
+    locale = resolve_locale!
+    resources = RESOURCES.map { |resource| { resource:, count: entries(resource, locale).count } }
+    render json: { resources:, page_size: PAGE_SIZE }
+  end
+
+  def show
+    locale = resolve_locale!
+    resource = params[:resource]
+    return head :not_found unless RESOURCES.include?(resource)
+
+    page = Integer(params.fetch(:page, '1'), exception: false)
+    return head :bad_request unless page && page.positive?
+
+    scope = entries(resource, locale)
+    return head :not_found if page > [(scope.count.to_f / PAGE_SIZE).ceil, 1].max
+
+    ids = scope.order(:id).offset((page - 1) * PAGE_SIZE).limit(PAGE_SIZE).pluck(:id)
+    render json: { ids: }
+  end
+
+  private
+
+  def entries resource, locale
+    named_tags = TagName.where(language_code: locale.language_code, primary_flg: true)
+        .select(:tag_id)
+    case resource
+    when 'posts'
+      Post.all
+    when 'tags'
+      Tag.where(id: named_tags)
+    when 'deerjikists'
+      Tag.where(id: named_tags).where(id: Deerjikist.select(:tag_id))
+    when 'materials'
+      Material.all
+    when 'descriptions'
+      TagDescription.where(language_code: locale.language_code, tag_id: named_tags)
+          .where.not(body: [nil, ''])
+          .where(TagDescriptionVersion
+              .where('tag_description_versions.tag_id = tag_descriptions.tag_id')
+              .where('tag_description_versions.language_code = tag_descriptions.language_code')
+              .where('tag_description_versions.version_no = tag_descriptions.version_no')
+              .arel.exists)
+    when 'tag_groups'
+      TagGroup.joins(:versions)
+          .where('tag_group_versions.version_no = tag_groups.version_no')
+    when 'theatres'
+      Theatre.kept
+    end
+  end
+end