为什么我的代码和Postgres没有连接

Question

I am trying to change my database.yml file to postgresql. This is an extension from my previous question Changing sqlite to pg Hope anyone could help

I have changed my database.yml file to what my question's answer was

this is my database.yml file

connection: &connection
adapter: postgresql
host: localhost
port: 5432
username: postgres
password: postgres
pool: 5
timeout: 5000
min_messages: warning

development:
  <<: *connection
  database: development_db_name
test:
  <<: *connection
 database: test_db_name

production:
  <<: *connection
  database: production_db_name

this is the exact indentation

i am getting:

ActiveRecord::ConnectionNotEstalblished
No connection pool with 'primary' found



vendor/cache/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:1013:in `retrieve_connection'
vendor/cache/gems/activerecord-5.2.3/lib/active_record/connection_handling.rb:118:in `retrieve_connection'
vendor/cache/gems/activerecord-5.2.3/lib/active_record/connection_handling.rb:90:in `connection'
vendor/cache/gems/activerecord-5.2.3/lib/active_record/migration.rb:554:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
vendor/cache/gems/activesupport-5.2.3/lib/active_support/callbacks.rb:98:in `run_callbacks'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/callbacks.rb:26:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/executor.rb:14:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/debug_exceptions.rb:61:in `call'
vendor/cache/gems/web-console-3.7.0/lib/web_console/middleware.rb:135:in `call_app'
vendor/cache/gems/web-console-3.7.0/lib/web_console/middleware.rb:30:in `block in call'
vendor/cache/gems/web-console-3.7.0/lib/web_console/middleware.rb:20:in `catch'
vendor/cache/gems/web-console-3.7.0/lib/web_console/middleware.rb:20:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
vendor/cache/gems/railties-5.2.3/lib/rails/rack/logger.rb:38:in `call_app'
vendor/cache/gems/railties-5.2.3/lib/rails/rack/logger.rb:26:in `block in call'
vendor/cache/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:71:in `block in tagged'
vendor/cache/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:28:in `tagged'
vendor/cache/gems/activesupport-5.2.3/lib/active_support/tagged_logging.rb:71:in `tagged'
vendor/cache/gems/railties-5.2.3/lib/rails/rack/logger.rb:26:in `call'
vendor/cache/gems/sprockets-rails-3.2.1/lib/sprockets/rails/quiet_assets.rb:13:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/request_id.rb:27:in `call'
vendor/cache/gems/rack-2.0.7/lib/rack/method_override.rb:22:in `call'
vendor/cache/gems/rack-2.0.7/lib/rack/runtime.rb:22:in `call'
vendor/cache/gems/activesupport-5.2.3/lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/executor.rb:14:in `call'
vendor/cache/gems/actionpack-5.2.3/lib/action_dispatch/middleware/static.rb:127:in `call'
vendor/cache/gems/rack-2.0.7/lib/rack/sendfile.rb:111:in `call'
vendor/cache/gems/railties-5.2.3/lib/rails/engine.rb:524:in `call'
vendor/cache/gems/puma-3.12.1/lib/puma/configuration.rb:227:in `call'
vendor/cache/gems/puma-3.12.1/lib/puma/server.rb:660:in `handle_request'
vendor/cache/gems/puma-3.12.1/lib/puma/server.rb:474:in `process_client'
vendor/cache/gems/puma-3.12.1/lib/puma/server.rb:334:in `block in run'
vendor/cache/gems/puma-3.12.1/lib/puma/thread_pool.rb:135:in `block in spawn_thread'

that is my full trace

Answer 1

Make sure you're installed postgresql on your local env and you've started it before opening your web app

Remove sqlite gem, and add gem 'pg' to your Gemfile.

For postgresql database configuration, below is mine and it works

default: &default
  adapter: postgresql
  encoding: unicode
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>

development:
  <<: *default
  database: my_app_development

test:
  <<: *default
  database: my_app_test

production:
  <<: *default
  database: my_app_production
  username: freelancer
  password: <%= ENV['FREELANCER_DATABASE_PASSWORD'] %>

Answer 2

重新插入代码，例如connection: &connection adapter: postgresql host: localhost port: 5432 username: postgres password: postgres pool: 5 timeout: 5000