rake - rake 迁移期间关系已存在

Question

我已经为精炼厂安装了一个博客引擎，它运行良好。

现在我生成了一些表字段更改的迁移(当然不是精炼厂或博客表)，但我收到一个错误:

== CreateBlogStructure: migrating ============================================
-- create_table("refinery_blog_posts", {:id=>true})
NOTICE: CREATE TABLE will create implicit sequence "refinery_blog_posts_id_seq1" for serial column "refinery_blog_posts.id"
rake aborted!
An error has occurred, this and all later migrations canceled:

PG::Error: ERROR: relation "refinery_blog_posts" already exists
: CREATE TABLE "refinery_blog_posts" ("id" serial primary key, "title" character varying(255), "body" text, "draft" boolean, "published_at" timestamp, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)

Tasks: TOP => db:migrate
(See full trace by running task with --trace)

Answer 1

检查您的 db/schema.rb

除了 db/migrate/[timestamp]your_migration 中的迁移之外，您很可能在那里创建了相同的表

如果 db/migrate/[timestamp]your_migration 与架构中找到的重复并且应该可以工作，则可以删除它。