Rails 4+ ActiveRecord 4.0 and above adds where.not so you can do this: Foo.includes(:bar).where.not(‘bars.id’ => nil) Foo.includes(:bar).where.not(bars: { id: nil }) When working with scopes between tables, I prefer to leverage merge so that I can use existing scopes more easily. Foo.includes(:bar).merge(Bar.where.not(id: nil)) Also, since includes does not always choose a join strategy, you should … Read more
The Asset Pipeline docs suggest how to do controller-specific JS: For example, if a ProjectsController is generated, there will be a new file at app/assets/javascripts/projects.js.coffee and another at app/assets/stylesheets/projects.css.scss. You should put any JavaScript or CSS unique to a controller inside their respective asset files, as these files can then be loaded just for these … Read more
Important: Make sure your app is not using I18n 0.6.8, it has a bug that prevents the configuration to be set correctly. Short answer In order to silence the warning edit the application.rb file and include the following line inside the Rails::Application body config.i18n.enforce_available_locales = true The possible values are: false: if you want to … Read more
In Rails 3 and higher: Rails.application.routes.url_helpers e.g. Rails.application.routes.url_helpers.posts_path Rails.application.routes.url_helpers.posts_url(:host => “example.com”)
I think the route for signing out is a DELETE method. This means that your sign out link needs to look like this: <%= link_to “Sign out”, destroy_user_session_path, :method => :delete %> Yours doesn’t include the :method => :delete part. Also, please note that for this to work you must also include <%= javascript_include_tag :defaults … Read more
<% %> Executes the ruby code within the brackets. <%= %> Prints something into erb file. <%== %> Equivalent to <%= raw %>. Prints something verbatim (i.e. w/o escaping) into erb file. (Taken from Ruby on Rails Guides.) <% -%> Avoids line break after expression. <%# %> Comments out code within brackets; not sent to … Read more
I believe what you are looking for is assign_attributes. It’s basically the same as update_attributes but it doesn’t save the record: class User < ActiveRecord::Base attr_accessible :name attr_accessible :name, :is_admin, :as => :admin end user = User.new user.assign_attributes({ :name => ‘Josh’, :is_admin => true }) # Raises an ActiveModel::MassAssignmentSecurity::Error user.assign_attributes({ :name => ‘Bob’}) user.name # … Read more
I believe you can do this: gem “foo”, path: “/path/to/foo”
You want to call .name on the object’s class: result.class.name
Here’s an example: class RenameOldTableToNewTable < ActiveRecord::Migration def self.up rename_table :old_table_name, :new_table_name end def self.down rename_table :new_table_name, :old_table_name end end I had to go and rename the model declaration file manually. Edit: In Rails 3.1 & 4, ActiveRecord::Migration::CommandRecorder knows how to reverse rename_table migrations, so you can do this: class RenameOldTableToNewTable < ActiveRecord::Migration def change … Read more