Rails 6 on Heroku: ActiveRecord::AdapterNotSpecified: 数据库配置没有指定适配器

Question

我们的 Rails 应用刚刚升级到 Rails 6.0，但部署到 Heroku 失败：

Preparing app for Rails asset pipeline
Running: rake assets:precompile
DEPRECATION WARNING: Including LoggerSilence is deprecated and will be removed in Rails 6.1. Please use `ActiveSupport::LoggerSilence` instead (called from <top (required)> at /tmp/build_b9759d496c72c1085bb8441e3c2159fb/config/application.rb:7)
rake aborted!
ActiveRecord::AdapterNotSpecified: database configuration does not specify adapter   
/tmp/build_b9759d496c72c1085bb8441e3c2159fb/vendor/bundle/ruby/2.6.0/gems/activerecord-6.0.0/lib/active_record/connection_adapters/connection_specification.rb:163:in `spec'

config/database.yml:

default: &default
  adapter: postgresql
  encoding: utf8
  pool: 5
  username: <%= ENV['POSTGRESQL_USER'] %>
  password:
  socket: /tmp/mysql.sock

development:
  <<: *default
  database: OurApplication_development

test:
  <<: *default
  database: OurApplication_test

production:
  url: <%= ENV['DATABASE_URL'] %>

使用版本：

rails (6.0.0)
Ruby (2.6.5)

有人知道如何解决这个问题吗？

Answer 1

问题已通过在database.yml中添加'adapter'到'production'解决。当我们的项目在 Rails 4 和 5 时，这不是必需的。

production:
 adapter: postgresql

Answer 2

一个更好的解决方案就是使用 ENV["DATABASE_URL"] 指定连接详细信息并将默认段保持为实际的最小默认值：

default: &default
  adapter: postgresql
  encoding: utf8
  pool: 5

development:
  <<: *default
  database: OurApplication_development

test:
  <<: *default
  database: OurApplication_test

production:
  # doing url: is just stupid as thats what rails does anyways
  <<: *default

这避免了潜在的开发者战争。您可以使用 DotEnv 为每个环境加载不同的环境变量。或者，您可以将另一个哈希添加到 database.yml 并合并它：

default: &default
  adapter: postgresql
  encoding: utf8
  pool: 5

local_settings: &local_settings
  # will raise an exception on nil instead of failing silently
  username: <%= ENV.fetch('POSTGRESQL_USER') %> 
  password:
  socket: /tmp/mysql.sock

development:
  <<: *default
  <<: *local_settings
  database: OurApplication_development

test:
  <<: *default
  <<: *local_settings
  database: OurApplication_test

production:
  # doing url: is just stupid as thats what rails does anyways
  <<: *default

Rails 6 on Heroku: ActiveRecord::AdapterNotSpecified: 数据库配置没有指定适配器

Rails 6 on Heroku: ActiveRecord::AdapterNotSpecified: database configuration does not specify adapter

ruby

ruby-on-rails

ruby-on-rails-6