ruby-on-rails – 用于nil的rake undefined方法`fields’：数据

发布时间：2020-12-16 21:05:35 所属栏目：百科来源：网络整理

导读：当我尝试做的时候 rake db:reset 要么 rake db:droprake db:createrake db:schema:loadrake db:seed 我随机得到一个NoMethodError：nil的未定义方法’fields’：种子出现时的NilClass. 这是一个： [1m[35m (186.0ms)[0m INSERT INTO "schema_migrations" (ve

当我尝试做的时候

rake db:reset

要么

rake db:drop
rake db:create
rake db:schema:load
rake db:seed

我随机得到一个NoMethodError：nil的未定义方法’fields’：种子出现时的NilClass.
这是一个：

[1m[35m (186.0ms)[0m  INSERT INTO "schema_migrations" (version) VALUES ('20130318105449')
[1m[36m (187.0ms)[0m  [1mINSERT INTO "schema_migrations" (version) VALUES ('20130319154146')[0m
[1m[35m (189.0ms)[0m  INSERT INTO "schema_migrations" (version) VALUES ('20130322132730')
[1m[36m (104.0ms)[0m  [1mINSERT INTO "schema_migrations" (version) VALUES ('20130322142814')[0m
NoMethodError: undefined method `fields' for nil:NilClass:               SELECT COUNT(*)
          FROM pg_class c
          LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
          WHERE c.relkind in ('v','r')
          AND c.relname = 'schema_migrations'
          AND n.nspname = ANY (current_schemas(false))

这是另一个：

[1m[35m (39.0ms)[0m  BEGIN
[1m[36mCategory Exists (107.0ms)[0m  [1mSELECT 1 AS one FROM "categories" WHERE "categories"."hash" = 'cat1' LIMIT 1[0m
[1m[35mSQL (124.0ms)[0m  INSERT INTO "categories" ("category_id","created_at","label","hash","updated_at") VALUES ($1,$2,$3,$4,$5) RETURNING "id"  [["category_id",58],["created_at",Mon,25 Mar 2013 15:07:53 CET +01:00],["label","Cat1"],["hash","cat1"],["updated_at",25 Mar 2013 15:07:53 CET +01:00]]
[1m[36m (117.0ms)[0m  [1mCOMMIT[0m
[1m[35m (162.0ms)[0m  BEGIN
[1m[36mCategory Exists (136.0ms)[0m  [1mSELECT 1 AS one FROM "categories" WHERE "categories"."hash" = 'cat2' LIMIT 1[0m
[1m[35mSQL (104.0ms)[0m  INSERT INTO "categories" ("created_at",$4) RETURNING "id"  [["created_at","Cat2"],"cat2"],25 Mar 2013 15:07:53 CET +01:00]]
[1m[36m (99.0ms)[0m  [1mCOMMIT[0m
[1m[35m (108.0ms)[0m  BEGIN
[1m[36mCategory Exists (173.0ms)[0m  [1mSELECT 1 AS one FROM "categories" WHERE "categories"."hash" = 'cat3' LIMIT 1[0m
NoMethodError: undefined method `fields' for nil:NilClass: SELECT  1 AS one FROM "categories"  WHERE "categories"."hash" = 'cat3' LIMIT 1

我真的不明白这是从哪里来的.有时我甚至没有错误,一切都完美插入.
经过一些测试后,它似乎取决于插入的速度.如果我从我的开发服务器执行此操作,它几乎总是成功.如果我从我的计算机上执行此操作,它几乎总是失败.

我在我的开发服务器上使用ruby 1.9.3本地和ruby 2.在我使用rails4(边缘)和我的驱动程序是postgresql(pg,没有指定版本)

解决方法

我在rails4(边缘)和postgres上也遇到了这个问题.我在solr上遇到它：reindex,所以我认为它不一定与插入有任何关系.当我弄清楚什么是错的时候我会更新这个.

编辑：
尝试更新到rails修订版1a838ccda4a31bb023985f6c977e6bc3e238cda9,它解决了我的问题.

这是关于它的github问题：https://github.com/rails/rails/issues/9710

我在快速的git bisect之后发现了它.它现在肯定在git中修复了.

（编辑：李大同）

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