Rails 的多个数据库不适用于远程数据库 [英] Multiple Databases With Rails Not Working For Remote Database
问题描述
我有一个远程只读 postgres 数据库,它由 cardano-db-sync.
I have a remote read-only postgres database that is maintained from a docker instance of cardano-db-sync.
我设法将开发数据库连接到它,它工作正常.但由于它是只读的,我想为用户和其他可修改表添加另一个数据库.
I managed to connect the development database to it, it was working fine. But since it is read-only I wanted to add another database for User and other modifiable tables.
这是我准备的设置:
# config/database.yml
default: &default
adapter: postgresql
encoding: unicode
pool: 5
development:
<<: *default
primary:
database: 'db_sync'
cexplorer:
database: 'cexplorer'
username: <%= ENV['HOST_PG_DATABASE_USERNAME'] %>
password: <%= ENV['HOST_PG_DATABASE_PASSWORD'] %>
host: <%= ENV['HOST_PG_DATABASE_IP'] %>
port: <%= ENV['HOST_PG_PORT'] %>
然后是文档说明
# app/models/application_record.rb
class ApplicationRecord < ActiveRecord::Base
self.abstract_class = true
connects_to database: { reading: :primary, write: :primary}
end
# app/models/cexplorer_record.rb
class CexplorerRecord < ApplicationRecord
self.abstract_class = true
connects_to database: { reading: :cexplorer }
end
然后是一些要测试的表:
then some tables to test:
# app/models/pool_hash.rb
class PoolHash < CexplorerRecord
self.table_name = 'pool_hash'
end
# app/models/pool.rb
class Pool < ApplicationRecord
end
主数据库似乎与 rails c
一起工作正常,但是一旦使用 PoolHash,我就会收到此错误:
The primary database seems to work fine with rails c
but once using PoolHash I get this error:
$ rails c
Running via Spring preloader in process 79267
Loading development environment (Rails 6.0.3.4)
2.6.1 :001 > PoolHash.count
Traceback (most recent call last):
4: from (irb):1
3: from app/models/pool_hash.rb:1:in `<main>'
2: from app/models/cexplorer_record.rb:1:in `<main>'
1: from app/models/cexplorer_record.rb:4:in `<class:CexplorerRecord>'
ActiveRecord::AdapterNotSpecified (The `cexplorer` database is not configured for the `development` environment.)
Available databases configurations are:
default
development
2.6.1 :002 > Pool.count
(0.5ms) SELECT COUNT(*) FROM "pools"
=> 0
2.6.1 :003 >
我不明白为什么它说 cexplorer 没有配置用于开发,而是在 database.yml
中与没有 :primary<时工作的配置相同/代码>
I don't get why it says cexplorer is not configured for development when is instead right there in database.yml
in the same config that worked when it was without the :primary
更新
似乎通过移动 <<: *default
事情有所改善:
it seems that by moving the <<: *default
things improved:
development:
primary:
<<: *default
database: 'swan_db_sync'
cexplorer:
<<: *default
database: 'cexplorer'
username: <%= ENV['HOST_PG_DATABASE_USERNAME'] %>
password: <%= ENV['HOST_PG_DATABASE_PASSWORD'] %>
host: <%= ENV['HOST_PG_DATABASE_IP'] %>
port: <%= ENV['HOST_PG_PORT'] %>
但我现在遇到了一个不同的问题:
but I now get a different problem:
rails c
Running via Spring preloader in process 79798
Loading development environment (Rails 6.0.3.4)
2.6.1 :001 > Pool.count
(4.2ms) SELECT COUNT(*) FROM "pools"
=> 0
2.6.1 :002 > PoolHash.count
Traceback (most recent call last):
1: from (irb):2
ActiveRecord::ConnectionNotEstablished (No connection pool with 'CexplorerRecord' found.)
更新 2
我现在尝试了一种设置,如本文中在单个 Rails 应用程序中管理多个数据库 link 来自 2017 年.
I have now tried a setup as in this article managing multiple databases in a single rails application link from 2017.
它工作正常.与 Rails 文档中的内容相比,它对我的目标也更有意义.我希望作为一篇旧文章不会给我带来惊喜.
It works fine. It also makes more sense for my goal than what is in the rails documentation. I hope being an old article won't give me surprises down the line.
推荐答案
我遇到了同样的问题,我的解决方案是将 establish_connection·:cexplorer
放在下面的 CexplorerRecord
类中connects_to
行.
I had the same issue my solution was to put establish_connection·:cexplorer
in my CexplorerRecord
class below the connects_to
line.
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