带有会话中间件的 Rails API 多个数据库不起作用

如何解决带有会话中间件的 Rails API 多个数据库不起作用

我得到的错误是

undefined method `[]=' for nil:NilClass
- actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:235:in `load!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:230:in `load_for_write!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:216:in `merge!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:19:in `create'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/session/abstract_store.rb:71:in `prepare_session'
        - rack (2.2.3) lib/rack/session/abstract/id.rb:265:in `context'
        - rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/cookies.rb:689:in `call'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:53:in `block in call'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:63:in `block (2 levels) in read_from_replica'
        - activesupport (6.1.3.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:62:in `block in read_from_replica'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:383:in `block (2 levels) in with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:1025:in `while_preventing_writes'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:381:in `block in with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:398:in `swap_connection_handler'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:373:in `with_handler'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:380:in `with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:175:in `connected_to'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:61:in `read_from_replica'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:39:in `read'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:63:in `select_database'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:52:in `call'
        - rack (2.2.3) lib/rack/etag.rb:27:in `call'
        - rack (2.2.3) lib/rack/conditional_get.rb:27:in `call'
        - rack (2.2.3) lib/rack/head.rb:12:in `call'

或

undefined method `id' for {}:Hash

- rack (2.2.3) lib/rack/session/abstract/id.rb:329:in `current_session_id'
        - rack (2.2.3) lib/rack/session/abstract/id.rb:313:in `load_session'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/session/abstract_store.rb:45:in `block in load_session'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/session/abstract_store.rb:53:in `stale_session_check!'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/session/abstract_store.rb:45:in `load_session'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:234:in `load!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:230:in `load_for_write!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:216:in `merge!'
        - actionpack (6.1.3.1) lib/action_dispatch/request/session.rb:19:in `create'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/session/abstract_store.rb:71:in `prepare_session'
        - rack (2.2.3) lib/rack/session/abstract/id.rb:265:in `context'
        - rack (2.2.3) lib/rack/session/abstract/id.rb:260:in `call'
        - actionpack (6.1.3.1) lib/action_dispatch/middleware/cookies.rb:689:in `call'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:53:in `block in call'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:63:in `block (2 levels) in read_from_replica'
        - activesupport (6.1.3.1) lib/active_support/notifications/instrumenter.rb:24:in `instrument'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:62:in `block in read_from_replica'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:383:in `block (2 levels) in with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:1025:in `while_preventing_writes'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:381:in `block in with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:398:in `swap_connection_handler'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:373:in `with_handler'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:380:in `with_role_and_shard'
        - activerecord (6.1.3.1) lib/active_record/connection_handling.rb:175:in `connected_to'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:61:in `read_from_replica'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector/resolver.rb:39:in `read'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:63:in `select_database'
        - activerecord (6.1.3.1) lib/active_record/middleware/database_selector.rb:52:in `call'

我使用 rails new my_api --api --database=postgresql

创建了一个新的仅限 Rails api 的应用程序

我按照 docs 的说法设置了多个数据库功能。

我将会话中间件重新添加到我的 api 中，因此我遵循了 docs

以下是我对新应用所做的唯一更改

require_relative "boot"

require "rails"
# Pick the frameworks you want:
require "active_model/railtie"
require "active_job/railtie"
require "active_record/railtie"
require "active_storage/engine"
require "action_controller/railtie"
require "action_mailer/railtie"
require "action_mailBox/engine"
require "action_text/engine"
require "action_view/railtie"
require "action_cable/engine"
# require "sprockets/railtie"
# require "rails/test_unit/railtie"

# Require the gems listed in Gemfile,including any gems
# you've limited to :test,:development,or :production.
Bundler.require(*Rails.groups)

module MyApi
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 6.1

    # Only loads a smaller set of middleware suitable for API only apps.
    # Middleware like session,flash,cookies can be added back manually.
    # Skip views,helpers and assets when generating a new resource.
    config.api_only = true


    # This also configures session_options for use below
    config.session_store :cache_store,key: '_app_session_key'

    # required for all session management (regardless of session_store)
    config.middleware.use Actiondispatch::Cookies

    config.middleware.use config.session_store,config.session_options

    config.active_record.database_selector = { delay: 2.seconds }
    config.active_record.database_resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver
    config.active_record.database_resolver_context = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session

  end
end