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  • Ruby on Rails Command Line: Part 2

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    Hi Friends,

    In my previous blog Rails Command Line Tools. I discussed about some rails command line tools. Today I am going to tell you about rake command in rails. rake is actually a ruby version of unix's make command. It is also used to performs some actions on your rails application. It is dependent on the directory in which you currently are. There are so many pre-build tasks for rails application. You can list the available rake tasks on a directory by hitting this command on your directory.

    rake --tasks:

    => Output will be like this that will also contain the description of each task

    $ bin/rake --tasks
    rake about              # List versions of all Rails frameworks and the environment
    rake assets:clean       # Remove old compiled assets
    rake assets:clobber     # Remove compiled assets
    rake assets:precompile  # Compile all the assets named in config.assets.precompile
    rake db:create          # Create the database from config/database.yml for the current Rails.env
    rake log:clear          # Truncates all *.log files in log/ to zero bytes (specify which logs with LOGS=test,development)
    rake middleware         # Prints out your Rack middleware stack
    rake tmp:clear          # Clear session, cache, and socket files from tmp/ (narrow w/ tmp:sessions:clear, tmp:cache:clear, tmp:sockets:clear)
    rake tmp:create         # Creates tmp directories for sessions, cache, sockets, and pids

    Rake commands are used for several purposes. Some of them are:

    1. For database related operations:
    Some of the operations that needs to be performed on db like running migration to simulate the tables as migration suggests

    rake db:create
    ## To create db for the application
    rake db:setup
    ## It not only creates the db but also runs the migration
    rake db:migrate
    ## It runs the latest migrations and simulates the db
    rake db:rollback
    ## It rollbacks the previous migration and sets the db to the previous state

    2. Assets related tasks:
    For compiling the assets (js, css) and cleaning them

    rake assets:precompile
    rake assets:clean

    3. about tasks

    It gives information about your rails application

    $ rake about
      About your application's environment
      Rails version   
      Ruby version              2.2.1-p85 (x86_64-linux)
      RubyGems version          2.4.8
      Rack version              1.6.4
      JavaScript Runtime        Node.js (V8)
      Middleware                Rack::Sendfile, ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x00000002fd2558>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, WebConsole::Middleware, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::Migration::CheckPending, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, Remotipart::Middleware, Rack::Head, Rack::ConditionalGet, Rack::ETag, Warden::Manager, OmniAuth::Builder, Rack::Pjax
      Application root          /home/shwetasingh/rails_apps/article_app_1
      Environment               development
      Database adapter          postgresql
      Database schema version   20160428123153

    4. Creating custom rake tasks:
    For creating custom rake tasks you can hit this command that will create a file with the namespace provided

    rails g task test_task
    ## =>
    create  lib/tasks/test_task.rake

    Now the generated file will look like this:

    namespace :test_task do
      ## Write your tasks here

    For more information related to custom rake task you can go through this link

    Hope you liked this blog. Will talk about more rails things soon.


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