TL;DR: rails g scaffold_controller <name> Even though you already have a model, you can still generate the necessary controller and migration files by using the rails generate option. If you run rails generate -h you can see all of the options available to you. Rails: controller generator helper integration_test mailer migration model observer performance_test plugin … Read more
Usually I do: rspec ./spec/controllers/groups_controller_spec.rb:42 Where 42 represents the line of the test I want to run. You can also use tags. See here. Using bundle exec: bundle exec rspec ./spec/controllers/groups_controller_spec.rb:42
In a case statement, a , is the equivalent of || in an if statement. case car when ‘toyota’, ‘lexus’ # code end Some other things you can do with a Ruby case statement
array = array.uniq uniq removes all duplicate elements and retains all unique elements in the array. This is one of many beauties of the Ruby language.
It appears that the :include functionality was changed with Rails 2.1. Rails used to do the join in all cases, but for performance reasons it was changed to use multiple queries in some circumstances. This blog post by Fabio Akita has some good information on the change (see the section entitled “Optimized Eager Loading”).
It’s destroy and destroy_all methods, like user.destroy User.find(15).destroy User.destroy(15) User.where(age: 20).destroy_all User.destroy_all(age: 20) Alternatively you can use delete and delete_all which won’t enforce :before_destroy and :after_destroy callbacks or any dependent association options. User.delete_all(condition: ‘value’) will allow you to delete records without a primary key Note: from @hammady’s comment, user.destroy won’t work if User model has … Read more
Place the following code in config/initializers/quiet_assets.rb if Rails.env.development? Rails.application.assets.try(:logger=, Logger.new(‘/dev/null’)) Rails::Rack::Logger.class_eval do def call_with_quiet_assets(env) previous_level = Rails.logger.level Rails.logger.level = Logger::ERROR if env[‘PATH_INFO’] =~ %r{^/assets/} call_without_quiet_assets(env) ensure Rails.logger.level = previous_level end alias_method_chain :call, :quiet_assets end end Updated: It now works for Ruby on Rails 3.2 too (previous attempt fixes before_dispatch, and now we’re going for the … Read more
Use #change_column. change_column(:table_name, :column_name, :date) # a few more examples: change_column(:suppliers, :name, :string, limit: 80) change_column(:accounts, :description, :text) NOTE: the same result can be achieved even outside of db migrations, this might be handy for testing/debugging but this method needs to be used very cautiously: ActiveRecord::Base.connection.change_column(:table_name, :column_name, :date)
One of the numerous niceties of Ruby is the possibility to extend existing classes with your own methods. That’s called “class reopening” or monkey-patching (the meaning of the latter can vary, though). So, take a look here: car = {:make => “bmw”, :year => “2003”} # => {:make=>”bmw”, :year=>”2003″} car.to_json # NoMethodError: undefined method `to_json’ … Read more
bundle exec is a Bundler command to execute a script in the context of the current bundle (the one from your directory’s Gemfile). rake db:migrate is the script where db is the namespace and migrate is the task name defined. So bundle exec rake db:migrate executes the rake script with the command db:migrate in the … Read more