\u5728\u7b2c112\u6bb5\u4e2d\u8bd5\u7528Rails 6\u4e2d\u7684\u65b0\u589e\u529f\u80fd\u3002\u8fd9\u6b21\u6211\u4eec\u8bb2\u89e3\u7684\u662fdatabase.yml\u8b66\u544a\u90e8\u5206\u3002
\n\u5728Rails 6\u4e2d\uff0c\u53ef\u4ee5\u652f\u6301\u591a\u4e2a\u6570\u636e\u5e93\uff0c\u4f46\u662f\u5982\u679c\u5728database.yml\u6587\u4ef6\u4e2d\u4f7f\u7528\u590d\u6742\u7684ERB\u8bed\u6cd5\uff0c\u5c31\u4f1a\u53d1\u51fa\u8b66\u544a\u3002<\/p>\n
\u6211\u5df2\u7ecf\u786e\u8ba4\u4e86Ruby 2.6.5\u548cRails 6.0.1\u3002(\u4f3c\u4e4e\u5728Rails 6.0.0\u4e2d\u5df2\u7ecf\u8fdb\u884c\u4e86\u4fee\u590d\u3002)<\/p>\n
$ <\/span>rails --version<\/span>\r\nRails 6.0.1\r\n<\/code><\/pre>\n\u4e3a\u4e86\u53d1\u51fa\u8b66\u544a\uff0c\u8fd9\u6b21\u6211\u60f3\u5c1d\u8bd5\u901a\u8fc7\u73af\u5883\u53d8\u91cfDB\u6765\u5207\u6362\u8bbf\u95eeMySQL\u6570\u636e\u5e93\u6216PostgreSQL\u6570\u636e\u5e93\u3002
\n\u4e0d\u4f7f\u7528\u591a\u4e2a\u6570\u636e\u5e93\u529f\u80fd\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2aRails\u9879\u76ee<\/h1>\n$ <\/span>rails new rails_sandbox\r\n$ <\/span>cd <\/span>rails_sandbox\r\n<\/code><\/pre>\n\u5728Gemfile\u4e2d\u6dfb\u52a0mysql2\u548cpg\u3002<\/h1>\n
\u4e3a\u4e86\u80fd\u591f\u8fde\u63a5\u5230MySQL\u548cPostgreSQL\uff0c\u9700\u8981\u5728Gemfile\u4e2d\u6dfb\u52a0mysql2\u548cpg\u3002<\/p>\n
gem<\/span> 'pg'<\/span>,<\/span> '>= 0.18'<\/span>,<\/span> '< 2.0'<\/span>\r\ngem<\/span> 'mysql2'<\/span>\r\n<\/code><\/pre>\n\u6267\u884c bundle install\u3002<\/p>\n
$ <\/span>bundle install<\/span>\r\n<\/code><\/pre>\n\u8bf7\u7f16\u8f91database.yml\u6587\u4ef6\u3002<\/h1>\n
\u4fee\u6539database.yml\u6587\u4ef6.<\/p>\n
\u6dfb\u52a0MySQL\u7684\u8fde\u63a5\u8bbe\u7f6e\u548cPostgreSQL\u7684\u8fde\u63a5\u8bbe\u7f6e\u3002<\/p>\n
\u901a\u8fc7\u73af\u5883\u53d8\u91cf\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5207\u6362\u8fde\u63a5\u7684\u529f\u80fd\u3002<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u5173\u952e\u662f`<%= ENV.fetch(“DB”) { ‘postgresql’ } %>`\u8fd9\u90e8\u5206\u3002
\n\u8fd9\u4e2a\u63cf\u8ff0\u5c06\u5bfc\u81f4\u8b66\u544a\u51fa\u73b0\u3002<\/p>\n
mysql<\/span>:<\/span> &mysql<\/span>\r\n adapter<\/span>:<\/span> mysql2<\/span>\r\n encoding<\/span>:<\/span> utf8mb4<\/span>\r\n pool<\/span>:<\/span> <%= ENV.fetch(\"RAILS_MAX_THREADS\") { 5 } %><\/span>\r\n username<\/span>:<\/span> root<\/span>\r\n password<\/span>:<\/span>\r\n host<\/span>:<\/span> db_mysql<\/span>\r\n\r\npostgresql<\/span>:<\/span> &postgresql<\/span>\r\n adapter<\/span>:<\/span> postgresql<\/span>\r\n encoding<\/span>:<\/span> unicode<\/span>\r\n pool<\/span>:<\/span> <%= ENV.fetch(\"RAILS_MAX_THREADS\") { 5 } %><\/span>\r\n host<\/span>:<\/span> db_postgresql<\/span>\r\n user<\/span>:<\/span> <%= ENV.fetch(\"POSTGRES_USER\") %><\/span>\r\n password<\/span>:<\/span> <%= ENV.fetch(\"POSTGRES_PASSWORD\") %><\/span>\r\n\r\ndevelopment<\/span>:<\/span>\r\n <<<\/span>:<\/span> *<\/span><%= ENV.fetch(\"DB\") { 'postgresql' } %><\/span>\r\n database<\/span>:<\/span> app_development<\/span>\r\n ...<\/span>\r\n\r\ntest<\/span>:<\/span>\r\n <<<\/span>:<\/span> *<\/span><%= ENV.fetch(\"DB\") { 'postgresql' } %><\/span>\r\n database<\/span>:<\/span> app_test<\/span>\r\n ...<\/span>\r\n\r\nproduction<\/span>:<\/span>\r\n <<<\/span>:<\/span> *<\/span><%= ENV.fetch(\"DB\") { 'postgresql' } %><\/span>\r\n database<\/span>:<\/span> app_production<\/span>\r\n ...<\/span>\r\n<\/code><\/pre>\n\u521b\u5efa\u811a\u672c<\/h1>\n
\u53ea\u662f\u4e3a\u4e86\u786e\u8ba4\uff0c\u6211\u4f1a\u5199\u4e00\u4e2a\u811a\u672c\u6765\u89e3\u6790database.yml\u6587\u4ef6\u5e76\u8f93\u51fa\u7ed3\u679c\u3002<\/p>\n
yml<\/span> =<\/span> ERB<\/span>.<\/span>new<\/span>(<\/span>File<\/span>.<\/span>read<\/span>(<\/span>Rails<\/span>.<\/span>root<\/span>.<\/span>join<\/span>(<\/span>'config\/database.yml'<\/span>)))<\/span>\r\nprint<\/span> yml<\/span>.<\/span>result<\/span>\r\n<\/code><\/pre>\n\u8fd0\u884c\u811a\u672c<\/h1>\n
\u6267\u884c\u811a\u672c\uff0c\u6ca1\u6709\u51fa\u73b0\u4efb\u4f55\u9519\u8bef\u5e76\u6210\u529f\u89e3\u6790\u3002<\/p>\n
\u8bf7\u6ce8\u610f\u4e0b\u4e00\u884c\u7684\u5f00\u53d1\u4ee3\u7801\uff1a <<: *postgresql \u7684\u5904\u7406\u6d41\u7a0b\u3002<\/p>\n
$ <\/span>bin\/rails runner scripts\/parse_database_yml.rb\r\nRunning via Spring preloader in <\/span>process 104\r\nmysql: &mysql\r\n adapter: mysql2\r\n ...\r\n\r\npostgresql: &postgresql\r\n adapter: postgresql\r\n ...\r\n\r\ndevelopment:\r\n <<: *<\/span>postgresql\r\n database: app_development\r\n ...\r\n<\/code><\/pre>\n\u6267\u884cdb:create<\/h1>\n
\u6267\u884cdb:create\u3002
\nRails\u65e0\u6cd5\u63a8\u65ad\u4f60\u662f\u5426\u5728\u4f7f\u7528\u591a\u4e2a\u6570\u636e\u5e93\uff0c\u4ece\u4f60\u7684database.yml\u4e2d…\u8bf7\u7b80\u5316\u4f60\u7684ERB\u3002\u8b66\u544a\u3002<\/p>\n
$ <\/span>bin\/rails db:create\r\nRails couldn't infer whether you are using multiple databases from your database.yml and can'<\/span>t generate the tasks for <\/span>the non-primary databases. If you'd like to use this feature, please simplify your ERB.\r\nCreated database '<\/span>app_development'\r\nCreated database '<\/span>app_test'\r\n<\/span><\/code><\/pre>\n\u4e3a\u4ec0\u4e48\u4f1a\u53d1\u51fa\u8b66\u544a<\/h1>\n
\u4e3a\u4e86\u652f\u6301\u591a\u4e2a\u6570\u636e\u5e93\uff0cRails\u5728\u542f\u52a8\u4e4b\u524d\u8bfb\u53d6database.yml\u6587\u4ef6\u5e76\u751f\u6210\u4efb\u52a1\u3002\u5728\u751f\u6210\u4efb\u52a1\u65f6\uff0c\u5b83\u4e0d\u4f7f\u7528ERB\u800c\u662f\u4f7f\u7528DummyCompiler\u8fdb\u884c\u89e3\u6790\uff0c\u5e76\u4e14\u636e\u8bf4DummyCompiler\u4f1a\u5728\u65e0\u6cd5\u5904\u7406\u7684\u60c5\u51b5\u4e0b\u53d1\u51fa\u8b66\u544a\u3002<\/p>\n
\u6211\u8be5\u600e\u4e48\u529e\u624d\u597d\uff1f<\/h1>\n
\u53ea\u8981\u4fee\u6539 ERB \u90e8\u5206\uff0c\u4f7f\u5176\u6ca1\u6709\u8b66\u544a\uff0c\u90a3\u5c31\u53ef\u4ee5\u4e86\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u901a\u5e38\u5e94\u8be5\u5982\u4f55\u4fee\u6539\uff0c\u7b14\u8005\u4e5f\u4e0d\u592a\u6e05\u695a\u3002<\/p>\n
\u4e3a\u4e86\u907f\u514d\u8b66\u544a\uff0c\u8fdb\u884c\u4fee\u590d\u3002<\/h1>\n
\u901a\u8fc7\u4fee\u6539\u5982\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u8b66\u544a\uff1a
\n\u6211\u4eec\u4f7f\u7528 if \u8bed\u53e5\u6dfb\u52a0\u4e86 default\uff0c\u5e76\u5207\u6362\u4e86\u4f7f\u7528\u5f00\u53d1\u73af\u5883\u7b49\uff0c\u8fd9\u6837\u4fee\u6b63\u540e\uff0c\u6211\u4eec\u4e0d\u518d\u4f7f\u7528 *default \u6765\u4f7f\u7528 ERB\u3002<\/p>\n
mysql<\/span>:<\/span> &mysql<\/span>\r\n adapter<\/span>:<\/span> mysql2<\/span>\r\n encoding<\/span>:<\/span> utf8mb4<\/span>\r\n pool<\/span>:<\/span> <%= ENV.fetch(\"RAILS_MAX_THREADS\") { 5 } %><\/span>\r\n username<\/span>:<\/span> root<\/span>\r\n password<\/span>:<\/span>\r\n host<\/span>:<\/span> db_mysql<\/span>\r\n\r\npostgresql<\/span>:<\/span> &postgresql<\/span>\r\n adapter<\/span>:<\/span> postgresql<\/span>\r\n encoding<\/span>:<\/span> unicode<\/span>\r\n pool<\/span>:<\/span> <%= ENV.fetch(\"RAILS_MAX_THREADS\") { 5 } %><\/span>\r\n host<\/span>:<\/span> db_postgresql<\/span>\r\n user<\/span>:<\/span> <%= ENV.fetch(\"POSTGRES_USER\") %><\/span>\r\n password<\/span>:<\/span> <%= ENV.fetch(\"POSTGRES_PASSWORD\") %><\/span>\r\n\r\ndefault<\/span>:<\/span> &default<\/span>\r\n <% database = ENV.fetch(\"DB\"){ 'postgresql' } %><\/span>\r\n <% if database == 'postgresql' %><\/span>\r\n <<<\/span>:<\/span> *postgresql<\/span>\r\n <% else %><\/span>\r\n <<<\/span>:<\/span> *mysql<\/span>\r\n <% end %><\/span>\r\n\r\ndevelopment<\/span>:<\/span>\r\n <<<\/span>:<\/span> *default<\/span>\r\n database<\/span>:<\/span> app_development<\/span>\r\n ...<\/span>\r\n\r\ntest<\/span>:<\/span>\r\n <<<\/span>:<\/span> *default<\/span>\r\n database<\/span>:<\/span> app_test<\/span>\r\n ...<\/span>\r\n\r\nproduction<\/span>:<\/span>\r\n <<<\/span>:<\/span> *default<\/span>\r\n database<\/span>:<\/span> app_production<\/span>\r\n ...<\/span>\r\n<\/code><\/pre>\n\u5617\u8a66\u904e\u7684\u91ac\u6599 de<\/h1>\n
\u8bd5\u9a8c\u7528\u7684\u6e90\u7801\u4f4d\u4e8e\u4ee5\u4e0b\u4f4d\u7f6e\uff1a
\nhttps:\/\/github.com\/suketa\/rails_sandbox\/tree\/try112_warn_database_yml – \u5b58\u5728\u8b66\u544a\u7684\u7248\u672c
\nhttps:\/\/github.com\/suketa\/rails_sandbox\/tree\/try112_warn_database_yml_fix – \u5df2\u4fee\u590d\u8b66\u544a\u7684\u7248\u672c<\/p>\n
\u53c2\u8003\u8d44\u6599<\/h1>\n\n- \n
Warn if we can’t read the yaml to create database tasks<\/ul>\n<\/li>\n<\/ul>\n <\/p>\n
Load YAML for rake tasks without parsing ERB<\/ul>\n","protected":false},"excerpt":{"rendered":"\u9996\u5148 \u5728\u7b2c112\u6bb5\u4e2d\u8bd5\u7528Rails 6\u4e2d\u7684\u65b0\u589e\u529f\u80fd\u3002\u8fd9\u6b21\u6211\u4eec\u8bb2\u89e3\u7684\u662fdatabase.yml\u8b66\u544a\u90e8\u5206\u3002 \u5728Ra […]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-41988","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n
\u8bd5\u7528Rails6\u65b0\u589e\u7684\u5c0f\u529f\u80fd\u4e4b\u4e00\uff1a112\uff08database.yml\u8b66\u544a\u90e8\u5206\uff09 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8bd5\u7528rails6\u65b0\u589e\u7684\u5c0f\u529f\u80fd\u4e4b\u4e00\uff1a112\uff08database-yml\u8b66\u544a\u90e8\u5206\uff09\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u8bd5\u7528Rails6\u65b0\u589e\u7684\u5c0f\u529f\u80fd\u4e4b\u4e00\uff1a112\uff08database.yml\u8b66\u544a\u90e8\u5206\uff09\" \/>\n<meta property=\"og:description\" content=\"\u9996\u5148 \u5728\u7b2c112\u6bb5\u4e2d\u8bd5\u7528Rails 6\u4e2d\u7684\u65b0\u589e\u529f\u80fd\u3002\u8fd9\u6b21\u6211\u4eec\u8bb2\u89e3\u7684\u662fdatabase.yml\u8b66\u544a\u90e8\u5206\u3002 \u5728Ra […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u8bd5\u7528rails6\u65b0\u589e\u7684\u5c0f\u529f\u80fd\u4e4b\u4e00\uff1a112\uff08database-yml\u8b66\u544a\u90e8\u5206\uff09\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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