在rails上的ruby中将sqlite更改为PostgreSQL
我正在使用win 7与docker和docker我在轨道上使用ruby，我做了一个适用于sqlite3的应用程序但是当我尝试上传到Heroku时，Heroku给了我一个错误，它不支持sqlite3所以我有将我的app数据库更改为PostgreSQL并进行了以下更改：在我的Gemfile中我评论了gem sqlite3：
# Use sqlite3 as the database for Active Record #gem 'sqlite3' #posgresql gem 'pg' 第二个我做了“捆绑安装”，然后是docker-compuse构建
然后在我的database.yml中：
之前：
default: &default adapter: sqlite3 pool: timeout: 5000 development: <<: *default database: db/development.sqlite3 # Warning: The database defined as "test" will be erased and # re-generated from your development database when you run "rake". # Do not set this db to the same as development or production. test: <<: *default database: db/test.sqlite3 production: <<: *default database: db/production.sqlite3
改变之后：
development: adapter: postgresql database: my_database_development pool: 5 timeout: 5000 test: adapter: postgresql database: my_database_test pool: 5 timeout: 5000 production: adapter: postgresql database: my_database_production pool: 5 timeout: 5000
所以当我试图用“rake db：create”创建一个新的数据库时，docker给了我下一个错误：
$ docker-compose run web rails db:create Starting grupo43_postgres_1 ... done could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"? Couldn't create database for {"adapter"=>"postgresql", "database"=>"my_database_ development", "pool"=>5, "timeout"=>5000} rails aborted! PG::ConnectionBad: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"? /usr/local/bundle/gems/pg-1.0.0/lib/pg.rb:56:in `initialize' /usr/local/bundle/gems/pg-1.0.0/lib/pg.rb:56:in `new' /usr/local/bundle/gems/pg-1.0.0/lib/pg.rb:56:in `connect' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ postgresql_adapter.rb:697:in `connect' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ postgresql_adapter.rb:221:in `initialize' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ postgresql_adapter.rb:38:in `new' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ postgresql_adapter.rb:38:in `postgresql_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:759:in `new_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:803:in `checkout_new_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:782:in `try_to_checkout_new_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:743:in `acquire_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:500:in `checkout' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:374:in `connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_adapters/ abstract/connection_pool.rb:931:in `retrieve_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_handling. rb:116:in `retrieve_connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/connection_handling. rb:88:in `connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/postgresql_dat abase_tasks.rb:10:in `connection' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/postgresql_dat abase_tasks.rb:19:in `create' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:117:in `create' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:137:in `block in create_current' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:305:in `block in each_current_configuration' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:302:in `each' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:302:in `each_current_configuration' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/tasks/database_tasks .rb:136:in `create_current' /usr/local/bundle/gems/activerecord-5.1.6/lib/active_record/railties/databases.r ake:27:in `block (2 levels) in ' /usr/local/bundle/gems/railties-5.1.6/lib/rails/commands/rake/rake_command.rb:21 :in `block in perform' /usr/local/bundle/gems/railties-5.1.6/lib/rails/commands/rake/rake_command.rb:18 :in `perform' /usr/local/bundle/gems/railties-5.1.6/lib/rails/command.rb:46:in `invoke' /usr/local/bundle/gems/railties-5.1.6/lib/rails/commands.rb:16:in `' /example/bin/rails:9:in `require' /example/bin/rails:9:in `' /usr/local/bundle/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load' /usr/local/bundle/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call' /usr/local/bundle/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call' /usr/local/bundle/gems/spring-2.0.2/lib/spring/client.rb:30:in `run' /usr/local/bundle/gems/spring-2.0.2/bin/spring:49:in `' /usr/local/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load' /usr/local/bundle/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `' /example/bin/spring:15:in `require' /example/bin/spring:15:in `' bin/rails:3:in `load' bin/rails:3:in `' Tasks: TOP => db:create (See full trace by running task with --trace)
我发现不同的解决方案，但对于Linux和Mac，我可以通知这里可能问题是因为我必须删除一些文件，我不知道我可以找到哪些窗口或Docker :(，我发现的所有信息在这里： PG :: ConnectionBad – 无法连接到服务器：连接被拒绝
这是我的docker-compose.yml文件：
version: '3' services: postgres: image: postgres:10.3 ports: - "3000" web: build: . env_file: - .env command: bash -c "(bundle check || bundle install) && bundle exec rails s -p 3000 -b '0.0.0.0'" volumes: - .:/example ports: - "3000:3000" depends_on: - postgres
确保已在机器中安装PostgreSQL并添加一个名为pgAdmin的有用工具，然后更新database.yml文件，如下所示
default: &default adapter: postgresql encoding: unicode username: postgres password: xxxxx #<-- which you have defiend while installing postgresql pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %> development: <<: *default database: project_development test: <<: *default database: project_test production: <<: *default database: project_production username: username password: <%= ENV['PROJECT_DATABASE_PASSWORD'] %>
和gem pg在你的Gemfile中使用，比如gem’pg gem 'pg', '~> 0.20.0'和这个版本然后运行bundle install
rake db:create rake db:migrate
为Heroku
heroku run rake db:migrate
如果你的rails版本是rails > 5.0.0 ，你可以使用rails命令而不是rake