ruby-on-rails – rake db：test：准备不创建所有表

试图让rails测试工作.

命令rake db：test：prepare似乎工作正常 –

$rake db:test:prepare -t
(in /home/beau/looked)
** Invoke db:test:prepare (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:abort_if_pending_migrations
** Execute db:test:prepare
** Invoke db:test:load (first_time)
** Invoke db:test:purge (first_time)
** Invoke environment 
** Execute db:test:purge
** Execute db:test:load
** Invoke db:schema:load (first_time)
** Invoke environment 
** Execute db:schema:load
NOTICE:  CREATE TABLE will create implicit sequence "slugs_id_seq" for serial column "slugs.id"
NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "slugs_pkey" for table "slugs"

但是有些表没有被创建.

这些是“开发”表：

$psql -d looked -U admin -c 'd'

               List of relations
 Schema |       Name        |   Type   | Owner 
--------+-------------------+----------+-------
 public | businesses        | table    | admin
 public | businesses_id_seq | sequence | admin
 public | categories        | table    | admin
 public | categories_id_seq | sequence | admin
 public | schema_migrations | table    | admin
 public | slugs             | table    | admin
 public | slugs_id_seq      | sequence | admin
(7 rows)

rake创建的表：db：为测试环境做准备 –

$psql -d looked_test -U admin -c 'd'
               List of relations
 Schema |       Name        |   Type   | Owner
--------+-------------------+----------+-------
 public | categories        | table    | admin
 public | schema_migrations | table    | admin
 public | slugs             | table    | admin
 public | slugs_id_seq      | sequence | admin
(4 rows)

正如您所看到的,它创建了一些表,但没有创建business,business_id_seq或categories_id_seq.

我不知道为什么,有人可以帮助我吗？