WIP

app/presenters/instance_presenter.rb

@@ -2,7 +2,7 @@
 
 class InstancePresenter < ActiveModelSerializers::Model
   attributes :domain, :title, :version, :source_url,
-             :description, :languages, :rules, :contact
+             :description, :languages, :rules, :report_categories, :contact
 
   class ContactPresenter < ActiveModelSerializers::Model
     attributes :email, :account
@@ -50,6 +50,13 @@ class InstancePresenter < ActiveModelSerializers::Model
     Rule.ordered
   end
 
+  def report_categories
+    # We only return the `violation` category if we have rules to violate:
+    Report.categories.filter_map do |category, _value|
+      { name: category } unless category == 'violation' && Rule.count.zero?
+    end
+  end
+
   def user_count
     Rails.cache.fetch('user_count') { User.confirmed.joins(:account).merge(Account.without_suspended).count }
   end

app/serializers/rest/instance_serializer.rb

@@ -15,6 +15,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
 
   has_one :contact, serializer: ContactSerializer
   has_many :rules, serializer: REST::RuleSerializer
+  has_many :report_categories, serializer: REST::ReportCategorySerializer
 
   def thumbnail
     if object.thumbnail

app/serializers/rest/report_category_serializer.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::ReportCategorySerializer < ActiveModel::Serializer
+  attributes :name
+
+  def name
+    object[:name]
+  end
+end