Ruby on rails Heroku迁移失败不可定义错误
我在开发和测试中使用sqlite,并部署到Heroku,Heroku在生产中使用Postgres。通过在终端中运行以下命令,我创建了一个新的“评论”模型:Ruby on rails Heroku迁移失败不可定义错误,ruby-on-rails,postgresql,heroku,rails-activerecord,rails-migrations,Ruby On Rails,Postgresql,Heroku,Rails Activerecord,Rails Migrations,我在开发和测试中使用sqlite,并部署到Heroku,Heroku在生产中使用Postgres。通过在终端中运行以下命令,我创建了一个新的“评论”模型: rails g model Review comment:text star:integer room:references reservation:references guest:references host:references type rails g model GuestReview --parent=Review --migr
rails g model Review comment:text star:integer room:references reservation:references guest:references host:references type
rails g model GuestReview --parent=Review --migration=false
rails g model HostReview --parent=Review --migration=false
rails db:migrate
这是上述命令的输出:
$ rails g model Review comment:text star:integer room:references reservation:references guest:references host:references type
Running via Spring preloader in process 6862
invoke active_record
create db/migrate/20180613031058_create_reviews.rb
create app/models/review.rb
invoke test_unit
create test/models/review_test.rb
create test/fixtures/reviews.yml
$ rails g model GuestReview --parent=Review --migration=false
Running via Spring preloader in process 6872
invoke active_record
create app/models/guest_review.rb
invoke test_unit
create test/models/guest_review_test.rb
create test/fixtures/guest_reviews.yml
$ rails g model HostReview --parent=Review --migration=false
Running via Spring preloader in process 6880
invoke active_record
create app/models/host_review.rb
invoke test_unit
create test/models/host_review_test.rb
create test/fixtures/host_reviews.yml
$ rails db:migrate
== 20180613031058 CreateReviews: migrating
====================================
-- create_table(:reviews)
-> 0.0806s
== 20180613031058 CreateReviews: migrated (0.0828s)
===========================
该网站在localhost上正常运行,当我在sqlite中检查数据时,我能够正确保存评论。当我部署到Heroku并运行
heroku run rake db:migrate
我得到以下错误:
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:
PG::UndefinedTable: ERROR: relation "guests" does not exist
: CREATE TABLE "reviews" ("id" serial primary key, "comment" text,
"star" integer DEFAULT 1, "room_id" integer, "reservation_id" integer,
"guest_id" integer, "host_id" integer, "type" character varying,
"created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL,
CONSTRAINT "fk_rails_b98b7304fe"
FOREIGN KEY ("room_id")
REFERENCES "rooms" ("id")
, CONSTRAINT "fk_rails_628a43e51f"
FOREIGN KEY ("reservation_id")
REFERENCES "reservations" ("id")
, CONSTRAINT "fk_rails_eaa1ce2871"
FOREIGN KEY ("guest_id")
REFERENCES "guests" ("id")
, CONSTRAINT "fk_rails_ac5cb4d097"
FOREIGN KEY ("host_id")
REFERENCES "hosts" ("id")
)
以下是供审阅的迁移文件:
class CreateReviews < ActiveRecord::Migration[5.0]
def change
create_table :reviews do |t|
t.text :comment
t.integer :star, default: 1
t.references :room, foreign_key: true
t.references :reservation, foreign_key: true
t.references :guest, foreign_key: true
t.references :host, foreign_key: true
t.string :type
t.timestamps
end
end
end
class CreateReviews
以下是审查模式:
class Review < ApplicationRecord
end
class GuestReview < Review
belongs_to :guest, class_name: "User"
end
class HostReview < Review
belongs_to :host, class_name: "User"
end
class Review
以下是guest_审查模型:
class Review < ApplicationRecord
end
class GuestReview < Review
belongs_to :guest, class_name: "User"
end
class HostReview < Review
belongs_to :host, class_name: "User"
end
class GuestReview
以下是host_审查模型:
class Review < ApplicationRecord
end
class GuestReview < Review
belongs_to :guest, class_name: "User"
end
class HostReview < Review
belongs_to :host, class_name: "User"
end
class HostReview
似乎在Heroku Postgres上,它正在寻找一张不存在的客人桌。是否有办法解决此错误,使其在我的开发环境和Heroku中正常运行?在迁移中,
t.references:guest,foreign\u key:true
做两件事:
guest\u id
的整数列(或bigint
,具体取决于Rails版本)guest\u id
列添加到guests
表中的id
列用户
(即用户
模型),而不是来宾
。由于名称不匹配,您必须调整调用以告知ActiveRecord要引用哪个表:
t.references :guest, foreign_key: { to_table: :users }
类似地,对于无法推断表名的任何其他t.references
调用
一旦解决了眼前的问题,就应该在开发环境中安装PostgreSQL,以便在同一个堆栈上进行开发、测试和部署。除了最简单和最琐碎的事情外,ActiveRecord无法提供数据库可移植性,因此使用不同的数据库进行开发和部署会带来灾难。在迁移中,
t.references:guest,foreign\u key:true
做两件事:
guest\u id
的整数列(或bigint
,具体取决于Rails版本)guest\u id
列添加到guests
表中的id
列用户
(即用户
模型),而不是来宾
。由于名称不匹配,您必须调整调用以告知ActiveRecord要引用哪个表:
t.references :guest, foreign_key: { to_table: :users }
类似地,对于无法推断表名的任何其他t.references
调用
一旦解决了眼前的问题,就应该在开发环境中安装PostgreSQL,以便在同一个堆栈上进行开发、测试和部署。除了最简单和最琐碎的事情外,ActiveRecord不提供数据库可移植性,因此使用不同的数据库进行开发和部署会导致灾难。您有用户表吗?看起来您正在尝试引用它。是的,有一个用户表。我尝试了您建议的更改,但在运行heroku run rake db:migrate:PG::UndefinedTable:error:relation“guest_reviews”不存在时出现了相同的错误。您正在引用用户表以获取ID。我用我认为可以解决您问题的方法更新了我的答案。您有用户表吗?看起来您正在尝试引用它。是的,有一个用户表。我尝试了您建议的更改,但在运行heroku run rake db:migrate:PG::UndefinedTable:error:relation“guest_reviews”不存在时出现了相同的错误。您正在引用用户表以获取ID。我用我认为可以解决您问题的方法更新了我的答案。