, which are traditionally used for separating “languages” and “regional setting” or “dialects”. Many international applications use only the “language” element of a locale such as :cs , :th or :es (for Czech, Thai and Spanish). However, there are also regional differences within diffe...
to apply templates to an existing Rails application. The location of the template needs to be passed in to an environment variable named LOCATION . Again, this can either be path to a file or a
In general editing existing migrations is not a good idea: you will be creating extra work for yourself and your co-workers and cause major headaches if the existing version of the migration has already been run on production machines. Instead, you should write a new migration that pe...
use ActionDispatch::Static use Rack::Lock use ActiveSupport::Cache::Strategy::LocalCache use Rack::Runtime use Rails::Rack::Logger use ActionDispatch::ShowExceptions use ActionDispatch::DebugExceptions use ActionDispatch::RemoteIp use Rack::Sendfile use ActionDispatch::Callbacks use A...
Not all caches will reliably cache content where the filename only differs by query parameters . Steve Souders recommends , “…avoiding a querystring for cacheable resources”. He found that in this case 5-20% of requests will not be cached. Query strings in particular do not work at al...
# routes.rb root :to => 'home#index' resources :posts # home_controller.rb class HomeController < ApplicationController def dashboard @users = User.last_ten.includes(:avatars) @posts = Post.all_today end end # posts_controller.rb class PostsController < ApplicationController def creat...
In addition to resource routing, Rails has powerful support for routing arbitrary URLs to actions. Here, you don’t get groups of routes automatically generated by resourceful routing. Instead, you set up each route within your application separately.
because of argument safety. Putting the variable directly into the conditions string will pass the variable to the database as-is . This means that it will be an unescaped variable directly from a user who may have malicious intent. If you do this, you put your entire database at risk...
But this approach becomes increasingly impractical as the table size increases, since User.all.each instructs Active Record to fetch the entire table in a single pass, build a model object per row, and then keep the entire array of model objects in memory. Indeed, if we have a large n...
is a connection between two Active Record models. Associations are implemented using macro-style calls, so that you can declaratively add features to your models. For example, by declaring that one model belongs_to another, you instruct Rails to maintain Primary Key–Foreign Key inform...
is a connection between two Active Record models. Associations are implemented using macro-style calls, so that you can declaratively add features to your models. For example, by declaring that one model belongs_to another, you instruct Rails to maintain Primary Key–Foreign Key inform...
The threats against web applications include user account hijacking, bypass of access control, reading or modifying sensitive data, or presenting fraudulent content. Or an attacker might be able to install a Trojan horse program or unsolicited e-mail sending software, aim at financial...
class ClientsController < ActionController::Base # This action uses query string parameters because it gets run # by an HTTP GET request, but this does not make any difference # to the way in which the parameters are accessed. The URL for # this action would look like this in order to...
Database constraints and/or stored procedures make the validation mechanisms database-dependent and can make testing and maintenance more difficult. However, if your database is used by other applications, it may be a good idea to use some constraints at the database level. Additional...
Testing support was woven into the Rails fabric from the beginning. It wasn’t an “oh! let’s bolt on support for running tests because they’re new and cool” epiphany. Just about every Rails application interacts heavily with a database – and, as a result, your tests will need a databas...
Rails is a web application development framework written in the Ruby language. It is designed to make programming web applications easier by making assumptions about what every developer needs to get started. It allows you to write less code while accomplishing more than many other la...
invoke active_record create db/migrate/[timestamp]_create_blorgh_posts.rb create app/models/blorgh/post.rb invoke test_unit create test/unit/blorgh/post_test.rb create test/fixtures/blorgh/posts.yml route resources :posts invoke scaffold_controller create app/controllers/blorgh/posts_...
method does the heavy lifting of rendering your application’s content for use by a browser. There are a variety of ways to customize the behaviour of render . You can render the default view for a Rails template, or a specific template, or a file, or inline code, or nothing at all. Yo...
Internally Rails only uses the migration’s number (the timestamp) to identify them. Prior to Rails 2.1 the migration number started at 1 and was incremented each time a migration was generated. With multiple developers it was easy for these to clash requiring you to rollback migration...
Not all caches will reliably cache content where the filename only differs by query parameters . Steve Souders recommends , “…avoiding a querystring for cacheable resources”. He found that in this case 5-20% of requests will not be cached. Query strings in particular do not work at al...
But this approach becomes increasingly impractical as the table size increases, since User.all.each instructs Active Record to fetch the entire table in a single pass, build a model object per row, and then keep the entire array of model objects in memory. Indeed, if we have a large n...
The threats against web applications include user account hijacking, bypass of access control, reading or modifying sensitive data, or presenting fraudulent content. Or an attacker might be able to install a Trojan horse program or unsolicited e-mail sending software, aim at financial...
class ClientsController < ActionController::Base # This action uses query string parameters because it gets run # by an HTTP GET request, but this does not make any difference # to the way in which the parameters are accessed. The URL for # this action would look like this in order to...
Database constraints and/or stored procedures make the validation mechanisms database-dependent and can make testing and maintenance more difficult. However, if your database is used by other applications, it may be a good idea to use some constraints at the database level. Additional...
Rails is a web application development framework written in the Ruby language. It is designed to make programming web applications easier by making assumptions about what every developer needs to get started. It allows you to write less code while accomplishing more than many other la...
$ rails generate scaffold HighScore game:string score:integer exists app/models/ exists app/controllers/ exists app/helpers/ create app/views/high_scores create app/views/layouts/ exists test/functional/ create test/unit/ create app/assets/stylesheets/ create app/views/high_scores/ind...
configures Rails itself to serve static assets. Defaults to true, but in the production environment is turned off as the server software (e.g. Nginx or Apache) used to run the application should serve static assets instead. Unlike the default setting set this to true when running (abs...
There are several ways to do this, some people create Rails Observers to fire off emails, others do it inside of the User Model. However, in Rails 3, mailers are really just another way to render a view. Instead of rendering a view and sending out the HTTP protocol, they are just send...
