ruby on rails for dummies

Ruby on Rails Twitter ApplicationProgramThe interface is very simple.Twitter is a simple rails application.The application interface for querying information is called as a GET request, while the application interface for modifying, creating, or deleting information is a POST request. The command itself is the URL read by your program. Twitter will respond in HTT

In Ruby rails, if you want to save a property (or read a property), and you want to do something else when you save the property (or read a property)You can use the method that overrides the property's setup or reader.For example, a models table has a field called name, and you want to manipulate the name.Method One,Class Model Method Two,Similar to method one, facilitates After_find and Before_save methods

in the article The rest API in Ruby on Rails uses an example of creating your own online translator tool based on cloud Platform + cloud services , using Ruby's net::http to initiate HTTP requests to access language translation services on IBM Bluemix , Tip: End offile reachedThe code is as follows:Auth = "C9819718-4660-441c-9df7-07398950ea44:quvrjpqwsgox"; surl = "https://" + auth + "@gateway. watsonplatfo

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

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

Provide content for the iphone Detecting Mobile Safari with Ruby on Rails application The IPhone and ipod touch make mobile Safari a popular American mobile browser. Although it is more than enough to present a regular web page with Mobile Safari, many web developers have created an application version for the IPhone. The "Use Ruby on

Create Rails Project To create a normal Rails project, you can use the following command directly: Rails New Blog But in the country because the speed of connection RubyGems is too slow, and Rails by default after building the project structure, will use the bundle command to download the installation de

Use Instantrails to quickly build ruby on rails development environment There's been a lot of interest in Ruby on Rails to see what's been praised by many people, but the development that has been done under Windows is a headache for Ruby on Rails's development environment,

Document reprinted by Fire Site Building InstituteTo install the oracle driver using gem in ruby on rails, see the original article: Reference content is as follows:[1] viewing locally installed plug-insGem list orGem list -- local[2] viewing remote available plug-insGem list -- romote[3] viewing oracle driversGem list -- remote | grep oracleThe result is as follows:Activerecord-oracle_enhanced

At this point, the implementation of this shopping cart is complete. Now we can use Rdoc in ruby to generate documents for our program, just like dotnet, java, and python, rdoc can extract the comments before class and method declaration in our code to generate a document. For our depot program, run the rake appdoc command in the rails command line, After that, you can view the generated d

Ruby on Rails (ROR) is equivalent to structs + spring + hibernate, but it is much more convenient, and there is almost no need to write configuration files, the development speed is also much faster (ROR is a 10 times faster than Java, and I don't think this number will be exaggerated ), ror's combination of Ajax technology makes developers feel very easy to develop (more convenient than DWR (Direct Web rem

Label: I/O, AR, SP on C file BSThis problem found during development todayThe per function of kaminari cannot be used in any configuration, and the page size is fixed at 30.At first, I thought it was the gem of ransack. I searched the internet for a long time and found that noFinally, check carefully. It turns out that the gemfile contains will_pagination. After you delete it, everything will return to normal.After you use kaminari in Ruby on

Some Suggestions on Ruby on Rails routing configuration, rubyrails When you need to add one or more actions to a RESTful Resource (do you really need it ?), Use member and collection routes. # Differential get 'subscriptions/: id/unsubscribe 'resources: subscriptions # Good resources: subscriptions do get 'unsubscribe', on: member end # differential get 'photos/search' resources: photos # Good resources: ph

Explain how to use mailer in Ruby on Rails, railsmailer Name mails SomethingMailer. Without the Mailer root, you cannot immediately see which is a Mailer and which view is related to it.Provides HTML and plain text view templates. An error occurred while sending emails in your development environment. These errors are disabled by default. # config/environments/development.rb config.action_mailer.raise_deli

Online information There are many, but a lot of pits, some have expired, and some do not conform to the current arrangement of some seemingly also with the OS system version has a relationship, do not copy, according to the actual situation to installMy system version is 10.12.31. Install XcodePlease follow the process installation, here does not elaborate2 HomebrewOfficial website: http://brew.sh/index_zh-cn.html Best FQ under, otherwise have to wait for a long time3.RVMCurl-l Https://get.rvm.i

In the previous section, we demonstrated how to build a list of items, and this time we built a simple shopping cart based on the previous content. 1. First we want to create a table that holds customer shopping information: Database scripts: drop table if exists line_items; CREATE TABLE Line_items ( ID int not NULL auto_increment, product_id int not null, quantity int NOT null DEFAU Lt 0, unit_price decimal (10,2) NOT NULL, constraint fk_items_product foreign key (product_id) references Pro

The last Test Modeul problem has not been resolved, but the following to continue, this time to test controller. 1. In the test\functional directory, rails has generated a corresponding test file for our controller, and note that Application_controller does not generate test files. Let's take control of the login Logincontroller as an example, open the LOGIN_CONTROLLER_TEST.RB, which reads as follows: Require File.dirname (__file__) + '/... /test_h

The most frequently run query on a database is to return a conforming result set based on a specified condition, and the query may be to return all the names ' Dave's order, or all the titles on a blog with rails, in many other frameworks and programming languages, you need to create SQL to execute queries, and Active record takes advantage of the dynamic capabilities that the Ruby language contains. For e