Ruby on Rails - creating a application in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails
How to Creating a Application in ruby on rails?
- Open up a command line or terminal. To generate a new rails application, use rails new command followed by the name of our application:
$ rails new my_appClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
This example assumes Ruby and Ruby on Rails have already been installed properly. Open up a command line or terminal. To generate a new rails application, use rails new command followed by the name of your application: $ rails new my_app If you want to create your Rails application with a specific Rails version then you can specify it at the time of generating the application. To do that, use rails _version_ new followed by the application name:
$ rails _4.2.0_ new my_app Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
- This example assumes Ruby and Ruby on Rails have already been installed properly. If not, you can find how to do it here.
- Open up a command line or terminal. To generate a new rails application, use rails new command followed by the name of your application:
- $ rails new my_app
- If you want to create your Rails application with a specific Rails version then you can specify it at the time of generating the application. To do that, use rails _version_ new followed by the application name:
- $ rails _4.2.0_ new my_app
- This will create a Rails application called MyApp in a my_app directory and install the gem dependencies that are already mentioned in Gemfile using bundle install.
- To switch to your newly created app's directory, use the cd command, which stands for change directory
$ cd my_appClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
The my_app directory has a number of auto-generated files and folders that make up the structure of a Rails application. Following is a list of files and folders that are created by default:
| File/Folder | Purpose |
|---|---|
| app/ | Contains the controllers, models, views, helpers, mailers and assets for your application. |
| bin/ | Contains the rails script that starts your app and can contain other scripts you use to setup, update, deploy or run your application. |
| config/ | Configure your application's routes, database, and more. |
| config.ru | Rack configuration for Rack based servers used to start the application. |
| db/ | Contains your current database schema, as well as the database migrations. |
| Gemfile Gemfile.lock | These files allow you to specify what gem dependencies are needed for your Rails application. These files are used by the Bundler gem. |
| lib/ | Extended modules for your application. |
| log/ | Application log files. |
| public/ | The only folder seen by the world as-is. Contains static files and compiled assets. |
| Rakefile | This file locates and loads tasks that can be run from the command line. The task definitions are defined throughout the components of Rails. |
| README.md | This is a brief instruction manual for your application. You should edit this file to tell others what your application does, how to set it up etc |
| test/ | Unit tests, fixtures, and other test apparatus. |
| temp/ | Temporary files (like cache and pid files). |
| vendor/ | A place for all third-party code. In a typical Rails application this includes vendored gems. |
Now you need to create a database from your database.yml file:
rake db:create
# OR
rails db:createClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
rake db:createClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
Now that we've created the database, we need to run migrations to set up the tables:
5.0
rake db:migrate
# OR
rails db:migrateClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
5.0
rake db:migrateClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
To start the application, we need to fire up the server:
$ rails server
# OR
$ rails sClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
By default, rails will start the application at port 3000. To start the application with different port number, we need to fire up the server like,
$ rails s -p 3010Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
If you navigate to http://localhost:3000 in your browser, you will see a Rails welcome page, showing that your application is now running.
If it throws an error, there may be several possible problems:
- There is a problem with the config/database.yml
- You have dependencies in your Gemfile that have not been installed.
- You have pending migrations. Run rails db:migrate
- In case you move to the previous migration rails db:rollback
If that still throws an error, then you should check your config/database.yml