fixed edge case for pool creation

app/models/post.rb

@@ -440,7 +440,7 @@ class Post < ActiveRecord::Base
           if pool.nil?
             pool = Pool.create(:name => $1, :description => "This pool was automatically generated")
           end
-          add_pool!(pool)
+          add_pool!(pool) if pool
 
         when /^rating:([qse])/i
           self.rating = $1.downcase

app/models/tag_implication.rb

@@ -28,7 +28,7 @@ class TagImplication < ActiveRecord::Base
             all.concat(children)
             children = self.class.where(["antecedent_name IN (?)", children]).all.map(&:consequent_name)
           end
-        end.sort
+        end.sort.uniq
       end
     end
 

script/upgrade_schema.rb

@@ -6,6 +6,7 @@ PoolVersion.find_each do |version|
   version.update_column(:post_ids, version.post_ids.scan(/\d+/).in_groups_of(2).map {|x| x.first}.join(" "))
 end
 
+TagImplication.destroy_all("antecedent_name = consequent_name")
 TagImplication.find_each do |impl|
   impl.update_descendant_names!
 end

script/upgrade_schema.sql

@@ -3179,14 +3179,14 @@ CREATE TABLE user_password_reset_nonces (
     created_at timestamp without time zone,
     updated_at timestamp without time zone
 );
-ALTER TABLE public.user_password_reset_nonces OWNER TO ayi;
+ALTER TABLE public.user_password_reset_nonces OWNER TO danbooru;
 CREATE SEQUENCE user_password_reset_nonces_id_seq
     START WITH 1
     INCREMENT BY 1
     NO MINVALUE
     NO MAXVALUE
     CACHE 1;
-ALTER TABLE public.user_password_reset_nonces_id_seq OWNER TO ayi;
+ALTER TABLE public.user_password_reset_nonces_id_seq OWNER TO danbooru;
 ALTER SEQUENCE user_password_reset_nonces_id_seq OWNED BY user_password_reset_nonces.id;
 ALTER TABLE user_password_reset_nonces ALTER COLUMN id SET DEFAULT nextval('user_password_reset_nonces_id_seq'::regclass);
 ALTER TABLE ONLY user_password_reset_nonces