What is a Scripts?

• A script or scripting language is a computer language with a series of commands within a file that is capable of being executed without being compiled.

Types of scripts in Ruby on Rails:

• Ruby on Rails gives valuable scripts, which you use during your project implementation.
• Now few scripts which you will utilize most frequently.

Script	Description
script/about	Gives information about environment.
script/breakpointer	Starts the breakpoint server.
script/console	Interactive Rails Console.
script/destroy	Deletes files created by generators.
script/generate	Used by generators.
script/runner	Executes a task in the rails context.
script/server	Launches the development server.
script/performance/profile	Profiles an expansive method.
script/performance/benchmarker	Benchmarks different methods.

Script Example

• Following script will start development server.

C:\ruby> ruby script/server

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C:\ruby> ruby script/server

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Running Rails Scripts

• RubyMine permits to execute Rails scripts using a single menu command.
• RubyMine suggests the scripts that reside in the []/script directory of your Rails application.
• Results for each script are displayed in its own Run Rails Script tab of the Run tool window, where you can evaluation the script output, change arguments if necessary, and rerun the script.

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To run a Rails script

Step 1:

• On the main menu, choose Tools | Run Rails Script. Run Rails Script dialog box is displayed.

Step 2:

• In the Script field, specify the desired script. If the script resides in the []/script directory, type its name only. If the script resides in another directory, type its fully qualified name.

Step 3:

• Alternatively, click the browse button .(Shift+Enter) and select the necessary location in the dialog that opens . Note that this dialog displays only the contents of the []/script directory.

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Step 4:

• In the Arguments field, specify the script's arguments, if any. The arguments should be separated with spaces. Alternatively, open the Edit Arguments dialog box by clicking the editor button , or pressing Shift+Enter, and type the list of arguments.

Step 5:

• Click Run.

To rerun a Rails script with new arguments

Step 1:

• In the Run tool window, click the desired Run Rails Script tab.

Step 2:

• In the toolbar of the Run tool window, click /help/img/idea/2017.2/editArguments.png. Edit Command Line Arguments dialog box is displayed.

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Step 3:

• In the Edit Command Line Arguments dialog box, type the new arguments separated with spaces, and click OK.

Step 4:

• In the toolbar of the Run tool window, click , or press Ctrl+F5

Rails scripts used in Rails application:

• Rails gives us outstanding tools that are used to develop Rails application.
• These tools are packaged as scripts from command line.
• Rails Console
• WEBrick Web Server
• Generators
• Migrations

Rails Console

• The Rails console is as command line usefulness which runs Rails application from the command line.
• The Rails console is an extension of Ruby irb.
• It provides all the features of irb along with the ability to auto-load Rails application environment, including all its classes and components.
• It helps you to walk through your application step-by-step.

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WEBrick Web server

• Rails is configured to automatically use WEBrick server.
• This server is written in pure Ruby and supports almost all platforms like Windows, Mac or Unix.
• Alternatively, if you have Mongrel or lighttpd server installed in your system, Rails uses either of those servers.

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• All the three Rails servers feature automatic reloading of code. It means, when you change your source code, you do not need to restart the server.

Generators

• The Rails include code generation scripts, which are used to automatically generate model and controller classes for an application.
• Code generation increases your productivity when developing Web applications.
• By running generator command, skeleton files for all your model and controller classes will be generated.
• It also generates, database migration files for each model it generates.

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Migrations

• Migrations bring Rails DRY feature to life.
• It is a pure Ruby code that define the structure of a database.
• You don't have to use SQL to write your code while using migration.
• The changes you make to your database schema is isolated in a separate migration file, which has a method to implement or reverse the change.

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