Apply aliases to characters in <character>_(cosplay) tags (#3409).

app/models/tag_implication.rb

@@ -21,7 +21,7 @@ class TagImplication < TagRelationship
       end
 
       def automatic_tags_for(names)
-        tags = names.grep(/\A(.+)_\(cosplay\)\Z/) { "char:#{$1}" }
+        tags = names.grep(/\A(.+)_\(cosplay\)\Z/) { "char:#{TagAlias.to_aliased([$1]).first}" }
         tags << "cosplay" if tags.present?
         tags.uniq
       end

test/unit/post_test.rb

@@ -790,6 +790,14 @@ class PostTest < ActiveSupport::TestCase
             assert(Tag.where(name: "someone_(cosplay)", category: 4).exists?, "expected 'someone_(cosplay)' tag to be created as character")
             assert(Tag.where(name: "someone", category: 4).exists?, "expected 'someone' tag to be created")
           end
+
+          should "apply aliases when the character tag is added" do
+            FactoryGirl.create(:tag_alias, antecedent_name: "jim", consequent_name: "james")
+            @post.add_tag("jim_(cosplay)")
+            @post.save
+
+            assert(@post.has_tag?("james"), "expected 'jim' to be aliased to 'james'")
+          end
         end
 
         context "for a parent" do