Link subjects into jurisprudences

app/controllers/concerns/jurisprudence_search.rb

@@ -11,6 +11,8 @@ module JurisprudenceSearch
         fulltext search_params[field], fields: [field] if search_params[field].present?
       end
 
+      with(:subject_ids).any_of(search_params[:subject_ids].split(",").map(&:strip).map(&:to_i)) if search_params[:subject_ids].present?
+
       order_by :doc_date
       order_by :year
 

app/models/cdao/jurisprudence.rb

@@ -5,6 +5,14 @@ class Cdao::Jurisprudence < Cdao::Base
 
   alias_attribute :doc_date, :docdate
 
+  def subjects
+    doctrines.map(&:subjects).flatten.uniq
+  end
+
+  def subject_ids
+    subjects.map(&:id)
+  end
+
   searchable do
     text :reference_number, stored: true
     text :title, stored: true
@@ -28,6 +36,7 @@ class Cdao::Jurisprudence < Cdao::Base
     integer :search_year do
       year.present? && year > 0 ? year : (doc_date.try :year)
     end
+    integer :subject_ids, multiple: true
 
     boolean :edited
   end