Considering Rails 3: html_safe actually “sets the string” as HTML Safe (it’s a little more complicated than that, but it’s basically it). This way, you can return HTML Safe strings from helpers or models at will. h can only be used from within a controller or view, since it’s from a helper. It will force … Read more
If your Rails version is between > 3.1.0 and < 4, place your fonts in any of the these folders: app/assets/fonts lib/assets/fonts vendor/assets/fonts For Rails versions > 4, you must place your fonts in the app/assets/fonts folder. Note: To place fonts outside of these designated folders, use the following configuration: config.assets.precompile << /\.(?:svg|eot|woff|ttf)\z/ For Rails … Read more
Rails 4.x When you already have users and uploads tables and wish to add a new relationship between them. All you need to do is: just generate a migration using the following command: rails g migration AddUserToUploads user:references Which will create a migration file as: class AddUserToUploads < ActiveRecord::Migration def change add_reference :uploads, :user, index: … Read more
title is a local variable. They only exists within its scope (current block) @title is an instance variable – and is available to all methods within the class. You can read more here: http://strugglingwithruby.blogspot.dk/2010/03/variables.html In Ruby on Rails – declaring your variables in your controller as instance variables (@title) makes them available to your view.
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