Question

输入heroku run rake db:migrate后，我看到了一个错误，

rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

PG::UndefinedTable: ERROR:  relation "notified_bies" does not exist
: CREATE TABLE "notifications" ("id" bigserial primary key, "user_id"     bigint, "notified_by_id" bigint, "post_id" bigint, "identifier" integer,     "notice_type" character varying, "read" boolean, "created_at" timestamp NOT     NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_b080fb4855"
FOREIGN KEY ("user_id")
  REFERENCES "users" ("id")
, CONSTRAINT "fk_rails_ff009aac1a"
FOREIGN KEY ("notified_by_id")
  REFERENCES "notified_bies" ("id")
, CONSTRAINT "fk_rails_ff8a02c41d"
FOREIGN KEY ("post_id")
  REFERENCES "posts" ("id")
)

，这是db文件夹中的迁移文件列表。

20180411215502_create_posts.rb
20180411215935_add_attachment_image_to_posts.rb
20180411225346_devise_create_users.rb
20180411230346_add_user_name_to_users.rb
20180411232041_add_user_id_to_posts.rb
20180412001819_create_comments.rb
20180412164718_add_attachment_avatar_to_users.rb
20180412164800_add_bio_to_users.rb
20180412193721_acts_as_votable_migration.rb
20180416212245_create_notifications.rb
20180416235802_create_follow_join_table.rb

20180416212245_create_notifications.rb

CreateNotifications < ActiveRecord::Migration[5.1] 
  def change 
    create_table :notifications do |t| 
      t.references :user, foreign_key: true 
      t.references :notified_by, foreign_key: true 
      t.references :post, foreign_key: true 
      t.integer :identifier 
      t.string :notice_type 
      t.boolean :read 

      t.timestamps 
    end 
  end
end

我会等你的建议谢谢你。

Answer 1

看起来您没有将引用指向正确的表。例如，informed_by_id应该使用外键引用。从这个意义上说，“informed_bies”不存在。如果“informed_by_id”是users表中的值，则按如下所示添加

t.references :user

Answer 2

创建外键时出现的错误

更新了答案

这是错误的原因

t.references :notified_by, foreign_key: true

现在，我不相信你有一个名为NotifiedBy的模型，你试图在这里引用它。

也许你只需要在这个领域找到一个索引。因此，您可能需要将其更改为

t.integer :notified_by, index: true

旧答案

FOREIGN KEY ("notified_by_id")
  REFERENCES "notified_bies" ("id")
, CONSTRAINT "fk_rails_ff8a02c41d"

您必须在20180416212245_create_notifications.rb中创建引用或外键。

删除条目应解决问题

PG :: UndefinedTable：部署Heroku时出错

2 个答案: