Fix #3412: Mass updates incorrectly move saved searches.

app/logical/moderator/tag_batch_change.rb

@@ -18,11 +18,12 @@ module Moderator
             post.update_attributes(:tag_string => tags)
           end
 
-          tags = Tag.scan_tags(antecedent, :strip_metatags => true)
-          conds = tags.map {|x| "query like ?"}.join(" AND ")
-          conds = [conds, *tags.map {|x| "%#{x.to_escaped_for_sql_like}%"}]
           if SavedSearch.enabled?
-            SavedSearch.where(*conds).find_each do |ss|
+            tags = Tag.scan_tags(antecedent, :strip_metatags => true)
+
+            # https://www.postgresql.org/docs/current/static/functions-array.html
+            saved_searches = SavedSearch.where("string_to_array(query, ' ') @> ARRAY[?]", tags)
+            saved_searches.find_each do |ss|
               ss.query = (ss.query.split - tags + [consequent]).uniq.join(" ")
               ss.save
             end

test/unit/moderator/tag_batch_change_test.rb

@@ -34,8 +34,21 @@ module Moderator
         ss = FactoryGirl.create(:saved_search, :user => @user, :query => "123 ... 456")
         tag_batch_change = TagBatchChange.new("...", "bbb", @user.id, "127.0.0.1")
         tag_batch_change.perform
-        ss.reload
-        assert_equal(%w(123 456 bbb), ss.query.scan(/\S+/).sort)
+
+        assert_equal("123 456 bbb", ss.reload.normalized_query)
+      end
+
+      should "move only saved searches that match the mass update exactly" do
+        ss = FactoryGirl.create(:saved_search, :user => @user, :query => "123 ... 456")
+        tag_batch_change = TagBatchChange.new("1", "bbb", @user.id, "127.0.0.1")
+        tag_batch_change.perform
+
+        assert_equal("... 123 456", ss.reload.normalized_query, "expected '123' to remain unchanged")
+
+        tag_batch_change = TagBatchChange.new("123 456", "789", @user.id, "127.0.0.1")
+        tag_batch_change.perform
+
+        assert_equal("... 789", ss.reload.normalized_query, "expected '123 456' to be changed to '789'")
       end
 
       should "raise an error if there is no predicate" do