ruby on rails examples

Notes for Ruby on Rails migration: rubyonrails migration Save schema. rb under version control.Use rake db: scheme: load to replace rake db: migrate to initialize an empty database.Use rake db: test: prepare to update the schema of the test database. Avoid setting default data in the table. Use the model layer instead. def amount self[:amount] or 0 end However, the use of self [: attr_name] is consider

Converting an array to activerecord::relation is a common requirement. For example, in my project, the backup_projects return value of the array form is obtained from the method. In order to sort and page out this collection, I need to convert it to activerecord::relation form. The conversion method is as follows: Project = Project.backup_projects project.map{|i| i.id} @projects = Project.where (: id = = Project) Now @projects is the activerecord::relation type. Original: https://aakashsharmaror

Rails is for Web projects and you have to think about the large amount of traffic, so let's take a look at how rails performs performance testing. 1. To perform performance testing, we first have to imitate a large number of data, we now know that in the test/fixtures/directory in the Yml file to add our test data, when the test run, the data will be loaded into the database. But a piece of two data can al

I mainly use two plug-ins: rinari and Yari. Rinari supports fast jump to multiple files in the rails project. In addition, it provides the grep tool, which I found useful. The shortcut keys are easy to remember. Yari provides an Emacs interface for the RI tool that comes with Ruby, which is compatible with the latest Ruby and easy to operate. You only need to u

Download the installer online railsinstaller-3.1.0 after automatic installationThe following error occurredC:\users\admin>gem Install Rubygems-updateError:could not find a valid gem ' rubygems-update ' (>= 0), where is:Unable to download data from https://rubygems.org/-Ssl_connect returNed=1 errno=0 State=sslv3 Read server certificate b:certificate verify failed (https://api.rubygems.org/latest_specs.4.8.gz)View Gem version information It feels like the version is too low so I want to update the

Deploying Network application Services is a hassle, installing programs, upgrading database schemas, switching versions, and restarting services. The more steps, the more human involvement, the more prone to problems. Capistrano is Ruby on Rails to provide the deployment solution, the original name Switchtower, a lot of names, the results and people heavy, replaced now this, it is estimated to be in order

In the previous Ruby on Rails development from scratch (Windows) (iii)-Implementation of the jump between pages, we created two pages for the jump migration, this time we write a single form of maintenance of the TIM Delete Check the example. 1. This time we recreate a project depot, and follow the steps in the previous article to create a depot project. 2. Create a database. You can use the

In the practice of agile development, the test drive is indispensable. This article looks at a test-driven development example in rails. Before we wrote and conducted some unit tests and functional tests, our customers suddenly asked to add a feature: Each user of the system could query the product. We first sketched some sketches to sort out our ideas and designs, and then we started writing code. We already have a general idea of what to do, but i

Ruby rails installation process description 1. create a user 2. assign permissions first add a user group: groupadd humou Add User, set the main directory, shell path useradd-g humou-d/home/humou-s/bin/bash-m humoushell path is not set, this user will not be able to log on or directly: useradd-g humou set password passwd humou delete a user: userdel humou corresponding user group will also be deleted to vi

Ruby on Rails internationalization, rubyrails Language-related settings and strings should not be used in views, models, and controllers. The text should be moved to the language file under config/locales. When the tags of the ActiveRecord model need to be translated, the scope of activerecord is used: en: activerecord: models: user: Member attributes: user: name: "Full name" Then User. model_name.

Explain how to use Cucumber in Ruby on Rails, railscucumber Use the @ wip label to mark your unfinished scenarios. These scenarios are not considered and are not marked as test failures. When an unfinished scenario is completed and the function test passes, the @ wip tag should be removed to add the scenario to the test suite.Configure your default configuration file to exclude the scenes marked as @ javasc

ActiveResource in Ruby on Rails When an HTTP response is in a different format (XML and JSON) than an existing one, you need to parse some additional formats to create a common format and use it in the category. The following methods should be implemented in the conventional format: extension, mime_type,Encode and decode. Module ActiveResource module Formats module Extend module CSVFormat extend self def e

Here simply add a few validations, non-empty, minimum length, uniqueModifying a modelModify the App/models/post.rb file as follows:Class Post At this time to run the service, modify/New model, when nothing is filled, can not be submitted, nor error.What's the reason?Because you didn't show the error message.Modify viewsModify the App/views/posts/new.html.erb file as follows:That is, addFor App/views/posts/edit.html.erb.Running the serviceRails S-b 192.168.xxx.xxx-p 3000, add a record, do not fil

Update:An updated version of these instructions for Ubuntu 12.10 (quantal Quetzal) is available here. 1. Install the prerequisites sudo apt-get install openjdk-7-jdk libjpeg62 libwebkitgtk-1.0-0 git-core Although Aptana Studio doesn't officially support openjdk, I 've not encountered any problems, however I 've not done extensive testing. Alternatively, to use the Sun JDK, do the following: sudo apt-get install libjpeg62 libwebkitgtk-1.0-0 git-coresudo add-apt-repository ppa:webupd8team/javasudo

At the beginning of 2006, I received a legacy project assigned by the company, asking me to be responsible for a server end of a C/S-based system. In fact, the system is based on the HTTP protocol, because the client's colleaguesI don't know much about server-side programming. Although I use PHP to be familiar with C ++, I am very familiar with it, but it is too slow to implement more functions and higher performance. The project is very suddenThis is because this colleague has more things to do

To have the zh-CN.yml file, this can be downloaded on GitHub, someone else made Gem for i18n Installation Config. i18n. default_locale = "ZH-CN" Add Zh-CN: Activerecord: Attributes: Product: Title: "title" Description: "Description" Image_url: "image"Because I guess it is related to the marked red below, there is a corresponding messages, but there is no attributes. After querying the information, I found that it is indeed the problem. The above product is my model, title is the name o

1. Install Curl:GPG--keyserver hkp://keys.gnupg.net--recv-keys d39dc0e3Curl-l Https://get.rvm.io | Bash-s StableSOURCE ~/.RVM/SCRIPTS/RVMCheck installation CompleteRvm-v2. Install RubyRVM Install 2.1.5RVM 2.1.5--defaultSwitch gem Source: Gem source-r https://rubygems.org/gem source-a https://ruby.taobao.org3. Install RailsGem Install RailsTest installation CompleteRails-v4. Install other, install Nodejs, Libmysqlclient-dev and so on, prevent the back run errorsudo apt-get install Nodejssudo apt-

to build a class method for the same purpose and return a Activerecord::relation object. You can also define a more streamlined scope. Class User Pay attention to the behavior of the Update_attribute method. It does not run model validation (unlike update_attributes) and may screw up the model state. Use a user-friendly web site. Displays descriptive model attributes, not just IDs, on the Web site.There are more than one way to achieve this: The To_param method of the overridd

For several days, ROR environment finally set up, in order to prevent later forget, less detours, special records ============================================= installation process 1. Installation rubyinstaller-1.9.2 2, install the implementation gem install Rails 3. Install dev Kit Download and unzip to Ruby's installation directory 4. Install NetBeans 6.9.1 5, open the NetBeans configuration Ruby g

In the previous essay Ruby on Rails development from scratch (Windows) (ii)-Create project and first Hello World, we described how to use instantrails to create a project and write a simple HelloWorld page, Today on the basis of the last, write a simple page jump. 1. Change the contents of the Say_controller.rb file in the Appcontrollers directory to the following: Class Saycontroller We see that compa