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我正在运行 Rails 7.0.0 和 Ruby 3.0.3 gem 'acts-as-taggable-on', '~> 9.0'。通过此设置和全新的 Rails 应用程序安装，我在运行rails db:migrate.

name@iMac project % rails db:migrate
== 20220105163513 ActsAsTaggableOnMigration: migrating ========================
-- create_table(:tags)
-> 0.0130s
-- create_table(:taggings)
-> 0.0085s
-- add_index(:taggings, :tag_id)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::DuplicateTable: ERROR: relation "index_taggings_on_tag_id" already exists
/Users/name/here/project/db/migrate/20220105163513_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb:26:in `up'

Caused by:
ActiveRecord::StatementInvalid: PG::DuplicateTable: ERROR: relation "index_taggings_on_tag_id" already exists
/Users/name/here/project/db/migrate/20220105163513_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb:26:in `up'

Caused by:
PG::DuplicateTable: ERROR: relation "index_taggings_on_tag_id" already exists
/Users/name/here/project/db/migrate/20220105163513_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb:26:in `up'

我已经用全新的 Rails 应用程序运行了多次，但同样的错误一遍又一遍地继续。

这是位于 /Users/name/here/project/db/migrate/20220105163513_acts_as_taggable_on_migration.acts_as_taggable_on_engine.rb:26 中的内容

'class ActsAsTaggableOnMigration < ActiveRecord::Migration[6.0]
  def self.up
    create_table ActsAsTaggableOn.tags_table do |t|
      t.string :name
      t.timestamps
    end

    create_table ActsAsTaggableOn.taggings_table do |t|
      t.references :tag, foreign_key: { to_table: ActsAsTaggableOn.tags_table }

      t.references :taggable, polymorphic: true
      t.references :tagger, polymorphic: true

      t.string :context, limit: 128

      t.datetime :created_at
    end

    add_index ActsAsTaggableOn.taggings_table, :tag_id
    add_index ActsAsTaggableOn.taggings_table, %i[taggable_id taggable_type context],
              name: 'taggings_taggable_context_idx'
  end

  def self.down
    drop_table ActsAsTaggableOn.taggings_table
    drop_table ActsAsTaggableOn.tags_table
  end
end`

另请参阅 GitHub 上的此问题：

https://github.com/mbleigh/acts-as-taggable-on/issues/1071

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