Create a new Ruby on Rails application using MySQL instead of SQLite

Question

I want to create my Rails application with MySQL  because I like it so much  How can I do that in the latest version of Rails instead of the default SQLite

User · Answer

On new project  easy peasy    rails new your new project name -d mysql   On existing project  definitely trickier  This has given me a number of issues on existing rails projects  This kind of works with me     On Gemfile  gem  mysql2      gt   0 3 18     lt  0 5    copied from a new project for rails 5 1    gem  activerecord-mysql-adapter    needed for mysql      On Dockerfile or on CLI  sudo apt-get install -y  mysql-client libmysqlclient-dev

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rails --help    is always your best friend  usage     rails new APP PATH options    also note that options should be given after the application name  rails and mysql    rails new project name -d mysql   rails and postgresql    rails new project name -d postgresql

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rails -d mysql ProjectName

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In Rails 3  you could do   rails new projectname --database mysql

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Just go to rails console and type   rails new YOURAPPNAME -d mysql

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Use following command to create new app for API with mysql database  rails new  lt appname gt  --api -d mysql     adapter  mysql2   encoding  utf8   pool  5   username  root   password     socket   var run mysqld mysqld sock

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If you have not created your app yet  just go to cmd for windows  or terminal for linux unix  and type the following command to create a rails application with mysql database    rails new  lt your app name gt  -d mysql  It works for anything above rails version 3  If you have already created your app  then you can do one of the 2 following things    Create a another name app with mysql database  go to cd another name config  and copy the database yml file from this new app  Paste it into the database yml of your app name app  But ensure to change the database names and set username password of your database accordingly in the database yml file after doing so    OR   Go to cd your app name config  and open database yml  Rename as following    development    adapter  mysql2    database  db name name   username  root   password    host  localhost   socket   tmp mysql sock  Moreover  remove gem  sqlite3  from your Gemfile and add the gem  mysql2

User · Answer

If you are creating a new rails application you can set the database using the -d switch like this   rails -d mysql myapp   Its always easy to switch your database later though  and using sqlite really is easier if you are developing on a Mac

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Create application with -d option  rails new AppName -d mysql

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you first should make sure that MySQL driver is on your system if not run this on your terminal if you are using Ubuntu or any Debian distro  sudo apt-get install mysql-client libmysqlclient-dev   and add this to your Gemfile  gem  mysql2      gt  0 3 16    then run in your root directory of the project   bundle install   after that you can add the mysql config to config database yml as the previous answers

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If you are using rails 3 or greater version  rails new your project name -d mysql   if you have earlier version   rails new -d mysql your project name   So before you create your project you need to find the rails version  that you can find by  rails -v

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database yml    MySQL  Versions 5 1 10 and up are supported      Install the MySQL driver     gem install mysql2     Ensure the MySQL gem is defined in your Gemfile     gem  mysql2      And be sure to use new-style password hashing      https   dev mysql com doc refman 5 7 en password-hashing html   default   amp default   adapter  mysql2   encoding  utf8   pool   lt    ENV fetch  RAILS MAX THREADS     5     gt    host  localhost   database  database name   username  username   password  secret  development     lt  lt    default    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     lt  lt    default    As with config secrets yml  you never want to store sensitive information    like your database password  in your source code  If your source code is   ever seen by anyone  they now have access to your database      Instead  provide the password as a unix environment variable when you boot   the app  Read http   guides rubyonrails org configuring html configuring-a-database   for a full rundown on how to provide these environment variables in a   production deployment      On Heroku and other platform providers  you may have a full connection URL   available as an environment variable  For example        DATABASE URL  mysql2   myuser mypass localhost somedatabase      You can use this database configuration with        production        url   lt    ENV  DATABASE URL     gt    production     lt  lt    default   Gemfile     Use mysql as the database for Active Record gem  mysql2     gt   0 4 4     lt  0 6 0

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Go to the terminal and write   rails new  lt project name gt  -d mysql

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First make sure that mysql gem is installed  if not  than type following command in your console  gem install mysql2   Than create new rails app and set mysql database as default database by typing following command in your console  rails new app-name -d mysql

User · Answer

If you already have a rails project  change the adapter in the config database yml file to mysql and make sure you specify a valid username and password  and optionally  a socket   development    adapter  mysql2   database  db name dev   username  koploper   password    host  localhost   socket   tmp mysql sock   Next  make sure you edit your Gemfile to include the mysql2 or activerecord-jdbcmysql-adapter  if using jruby

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rails new  lt project name gt  -d mysql   OR  rails new projectname   Changes in config database yml  development    adapter  mysql2   database  db name name   username  root   password    host  localhost   socket   tmp mysql sock

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For Rails 3 you can use this command to create a new project using mysql     rails new projectname -d mysql

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Normally  you would create a new Rails app using  rails ProjectName   To use MySQL  use  rails new ProjectName -d mysql

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You should use the switch -D instead of -d because it will generate two apps  and mysql with no documentation folders     rails -D mysql project name   less than version 3     rails new project name -D mysql  version 3 and up    Alternatively you just use the --database option

[mysql] Create a new Ruby on Rails application using MySQL instead of SQLite

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