Passing parameters in rails redirect_to
Just append them to the options: redirect_to controller: ‘thing’, action: ‘edit’, id: 3, something: ‘else’ Would yield /thing/3/edit?something=else
ruby-on-rails
Ruby: Is there an opposite of include? for Ruby Arrays?
if @players.exclude?(p.name) … end ActiveSupport adds the exclude? method to Array, Hash, and String. This is not pure Ruby, but is used by a LOT of rubyists. Source: Active Support Core Extensions (Rails Guides)
Rails new vs create
Within Rails’ implementation of REST new and create are treated differently. An HTTP GET to /resources/new is intended to render a form suitable for creating a new resource, which it does by calling the new action within the controller, which creates a new unsaved record and renders the form. An HTTP POST to /resources takes … Read more
Want to find records with no associated records in Rails
Update 4 – Rails 6.1 Thanks to Tim Park for pointing out that in the upcoming 6.1 you can do this: Person.where.missing(:contacts) Thanks to the post he linked to too. Update 3 – Rails 5 Thanks to @Anson for the excellent Rails 5 solution (give him some +1s for his answer below), you can use … Read more
Rails has_many with alias name
Give this a shot: has_many :jobs, foreign_key: ‘user_id’, class_name: ‘Task’ Note, that :as is used for polymorphic associations. Also, foreign_key option for has_many.
How to rollback just one step using rake db:migrate
For starters rake db:rollback will get you back one step then rake db:rollback STEP=n Will roll you back n migrations where n is the number of recent migrations you want to rollback. More references here.
How to change a nullable column to not nullable in a Rails migration?
If you do it in a migration then you could probably do it like this: # Make sure no null value exist MyModel.where(date_column: nil).update_all(date_column: Time.now) # Change the column to not allow null change_column :my_models, :date_column, :datetime, null: false
How to pass arguments into a Rake task with environment in Rails? [duplicate]
Just to follow up on this old topic; here’s what I think a current Rakefile (since a long ago) should do there. It’s an upgraded and bugfixed version of the current winning answer (hgimenez): desc “Testing environment and variables” task :hello, [:message] => :environment do |t, args| args.with_defaults(:message => “Thanks for logging on”) puts “Hello … Read more
What do helper and helper_method do?
The method helper_method is to explicitly share some methods defined in the controller to make them available for the view. This is used for any method that you need to access from both controllers and helpers/views (standard helper methods are not available in controllers). e.g. common use case: #application_controller.rb def current_user @current_user ||= User.find_by_id!(session[:user_id]) end … Read more
Rails: Missing host to link to! Please provide :host parameter or set default_url_options[:host]
You need to add the following line at every environment: config.action_mailer.default_url_options = { :host => “yourhost” } That way, it can work in all environments and could be different from environment to environment. For example: development.rb config.action_mailer.default_url_options = { :host => “dev.yourhost.com” } test.rb config.action_mailer.default_url_options = { :host => “test.yourhost.com” } production.rb config.action_mailer.default_url_options = { … Read more