关于ruby on rails：ActiveRecord :: NoDatabaseError：具有ID的本地用户不存在

ActiveRecord::NoDatabaseError: local user with ID does not exist

开发一个仅限API的Rails应用程序来使用API??中的数据，过滤掉许多字段，然后广播我们想要公开的字段。

我的应用程序正常返回数据，但我意识到在源API级别上，我们更改了我们正在公开的数据字段之一的数据类型。为了适应，我提交了我的工作，检查了一个新分支，运行迁移以更改数据字段的数据类型，决定我对它的工作方式不满意，回滚迁移，提交和签出主分支。该应用正常返回数据。但是，现在当我使用像.first，.last等查找程序方法在Rails控制台中测试我的模型记录时，我得到以下错误。他们以前工作得很好。

我环顾四周，并没有看到任何关于这个特定错误的线程(他们似乎都在寻找显示页面的个别记录) - 虽然这个，这个线程(通过扩展)看起来最接近。检查我正在使用的数据库上的用户显示错误中的用户ID("501")不存在。

我做了什么，我需要做什么才能再次调用finder方法？我是否需要在我的数据库中的错误中创建引用的用户？ (为什么它不是我一直用来连接到我的数据库的默认用户？错误中的用户ID来自哪里？它甚至重要吗？)

ps - 如果它是相关的，我使用rake db:rollback按照这个线程回滚我的迁移。

提前致谢。

Rails控制台

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.2.1 :001 > KoboApi.first
ActiveRecord::NoDatabaseError: local user with ID 501 does not exist

from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:661:in `rescue in connect'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:651:in `connect'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-postgis-adapter-3.1.4/lib/active_record/connection_adapters/postgis_adapter.rb:51:in `initialize'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-postgis-adapter-3.1.4/lib/active_record/connection_adapters/postgis/create_connection.rb:37:in `new'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-postgis-adapter-3.1.4/lib/active_record/connection_adapters/postgis/create_connection.rb:37:in `postgis_connection'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
from /Users/toby/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
from /Users/toby/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.5.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
... 13 levels...
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/commands/console.rb:9:in `start'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:68:in `console'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/railties-4.2.5.1/lib/rails/commands.rb:17:in `<top (required)>'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:274:in `require'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:274:in `block in require'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:274:in `require'
from /Users/toby/code/projects/koboApi-broker/bin/rails:9:in `<top (required)>'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `block in load'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:240:in `load_dependency'
from /Users/toby/.rvm/gems/ruby-2.2.1/gems/activesupport-4.2.5.1/lib/active_support/dependencies.rb:268:in `load'
from /Users/toby/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /Users/toby/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'

我肯定得到我的记录 - 他们进入数据库：

Rails dbconsole

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koboApi_development=# select * from kobo_apis limit 1;
id | lemurs_quantity | month_and_year | _geolocation | lemur_category | location_admin1 | location_admin2 | record_id | sighting_month | sighting_year
------+-----------------+----------------+--------------+----------------+-----------------+-----------------+-----------+----------------+---------------
1365 | 1 | | | I_dont_remembe | antsiranana | diana | 1234567 | no_response | 2013
(1 row)

koboApi_development=# \du
List of roles
Role name | Attributes | Member of
-----------+------------------------------------------------+-----------
[user] | Superuser, Create role, Create DB, Replication | {}

从我的架构

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ActiveRecord::Schema.define(version: 20160705203507) do

# These are extensions that must be enabled in order to support this database
enable_extension"plpgsql"
enable_extension"postgis"

create_table"kobo_apis", force: :cascade do |t|
t.integer"lemurs_quantity"
t.date "month_and_year"
t.text "_geolocation"
t.text "lemur_category"
t.string "location_admin1"
t.string "location_admin2"
t.integer"record_id"
t.string "sighting_month"
t.string "sighting_year"
end

create_table"my_spatial_table", force: :cascade do |t|
t.geography"polygon_data", limit: {:srid=>4326, :type=>"polygon", :geographic=>true}
end

end

我的database.yml

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development:
adapter: postgis
encoding: unicode
postgis_extension: postgis # default is postgis
postgis_schema: public # default is public
schema_search_path: public,postgis
database: koboApi_development
pool: 5

test:
adapter: postgresql
encoding: unicode
database: koboApi_test
pool: 5

production:
adapter: postgresql
encoding: unicode
database: koboApi_production
pool: 5

它似乎是Spring的问题，而不是数据库，如果你收到这个错误：

1 2	/Users/yad/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.6/lib/active_record/connection_adapters/postgresql_adapter.rb:661:in `rescue in connect': local user with ID 501 does not exist (ActiveRecord::NoDatabaseError)

在rails根目录中输入：

spring stop

它应该说：

Spring stopped.

并且迁移将在那之后工作！