升级到rails 4.1后,act-as-taggable-on无效

Question

我已将我的应用程序的rails版本升级到4.1.0.在升级时,我已经从Gemfile升级了所有宝石,Gemfile也将act-as-taggable-on升级到3.1.1.

但升级后,当我尝试在相应的对象上添加标签时,它失败并出现以下错误.

  post = Post.last
  post.tag_list = "development"
  post.save

错误:列"taggings_count"不存在

细节错误在这里:

SQL (0.9ms)  UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = 3146
PG::UndefinedColumn: ERROR:  column "taggings_count" does not exist
LINE 1: UPDATE "tags" SET "taggings_count" = COALESCE("taggings_coun...
                                                      ^
: UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = 3146
   (0.3ms)  ROLLBACK
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "taggings_count" does not exist
LINE 1: UPDATE "tags" SET "taggings_count" = COALESCE("taggings_coun...
                                                      ^
: UPDATE "tags" SET "taggings_count" = COALESCE("taggings_count", 0) - 1 WHERE "tags"."id" = 3146

Answer 1

我们必须这样做,

rake acts_as_taggable_on_engine:安装:迁移

由于act-as-taggable-on添加了新的迁移.