Rake db:migrate error 'PG::UndefinedColumn: ERROR: column "slug" does not exist'

Question

我正在将我自己的存储库克隆到我的本地机器上，另一位开发人员已经完成了一些工作。我正在尝试迁移数据库并收到此错误：

/Users/lewisfrost/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.0.1/lib/active_support/values/time_zone.rb:282: warning: circular argument reference - now
DEPRECATION WARNING: Support for Rails < 4.1.0 will be dropped. (called from <top (required)> at /Users/lewisfrost/frostfires/config/application.rb:8)
==  AddUploadFileToAnswer: migrating ==========================================
-- add_column(:answers, :upload_file, :string)
   -> 0.0006s
-- add_index(:answers, :slug)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedColumn: ERROR:  column "slug" does not exist
: CREATE  INDEX  "index_answers_on_slug" ON "answers"  ("slug")/Users/lewisfrost/frostfires/db/migrate/20140126204815_add_upload_file_to_answer.rb:4:in `change'
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR:  column "slug" does not exist
: CREATE  INDEX  "index_answers_on_slug" ON "answers"  ("slug")
/Users/lewisfrost/frostfires/db/migrate/20140126204815_add_upload_file_to_answer.rb:4:in `change'
PG::UndefinedColumn: ERROR:  column "slug" does not exist
/Users/lewisfrost/frostfires/db/migrate/20140126204815_add_upload_file_to_answer.rb:4:in `change'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

SCHEMA.rb

  create_table "answers", force: true do |t|
    t.string   "user"
    t.text     "body"
    t.integer  "question_id"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.integer  "user_id"
    t.string   "upload_file"
    t.string   "slug"
  end

迁移文件

class AddUploadFileToAnswer < ActiveRecord::Migration
  def change
    add_column :answers, :upload_file, :string
    add_index :answers, :slug

  end
end

任何建议都很好

Answer 1

这意味着您的 table 中没有 slug 列，但您想要索引 thia 列。

检查您的迁移文件是否存在该列，如果不存在则创建迁移以添加 slug 列，然后运行索引。

Answer 2

很确定您的 answers table 中没有 slug 列。

所以使用迁移添加：

rails g migration AddSlugToAnswers slug:string

然后，运行迁移：

bundle exec rake db:migrate

Rake db:migrate error 'PG::UndefinedColumn: ERROR: column "slug" does not exist'

Rake db:migrate error 'PG::UndefinedColumn: ERROR: column "slug" does not exist'

ruby

postgresql

rake

ruby-on-rails