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最新文章 : Ruby

Ruby 一步步安装

http://www.gayathri-frenzy.com/technology/ruby-on-rails
I kept thinking for a while on what do I have next in the store
Here we go “Ruby on Rails”
Ruby on Rails, often shortened to Rails or RoR, is an open source web application framework for the Ruby Programming language.Ruby is a pure object-oriented programming language with a super-clean syntax that makes programming elegant and fun.
What is Rails?
Rails is an open source Ruby framework for developing web-based, databasedriven applications. Dozens of frameworks are out and most of them have been around much longer than Rails. Why do we then have a different framework?
Rails help us in developing a web application at least ten times faster than we can with a typical Java framework. We can–without making any sacrifices in the quality of our application!
When I got started with this topic, I just lacked a proper installation guide to help me with the installation. So I’m trying to make my reader&rsq ......

win环境下本地安装ruby on rails

文章转自 http://www.ej38.com/showinfo/Ruby-140367.html
过程如下：
1、ruby下载一键安装：
http://rubyforge.org/frs/download.php/29263/ruby186-26.exe
ruby -v 显示版本，安装成功
2、下载rubygems安装：
http://rubyforge.org/frs/download.php/60719/rubygems-1.3.5.zip
解压，ruby setup.rb
gem -v 显示版本，安装成功
3、下载rails的 gem 安装（gem install -l 本地安装）：
http://rubyforge.org/frs/download.php/63167/rails-2.3.4.gem

gem install -l rails-2.3.4.gem

会提示依赖：
rails requires rake (>= 0.8.3, runtime

下载
rake：
http://rubyforge.org/frs/download.php/56871/rake-0.8.7.gem

继续
gem install -l rails-2.3.4.gem
提示依赖：
rails requires activesupport (= 2.3.4
下载
activesupport ：
http://rubyforge.org/frs/download.php/63162/activesupport-2.3.4.gem

如此，依次下载所有依赖：
activerecord：
http://rubyforge.org/frs/download.php/63163/activerecord-2.3.4.gem
actionpack：
http://rubyforge.org/frs/ ......

ruby on rails 解决multiple select 存储和update

操作系统ubuntu，开发工具netbeans
vendor数据库表有字段service_category varchar(100)
<% form_for :vendor, @vendor, :url => sellers_path do |f| %>
<%= f.select(:service_category,
                   ["Painting","Plumbing","Decor"], {}, {:multiple => true, :size => 3}) %>
<%= f.submit "Register"%>
<% end %>
url 指定到哪个control action，用的是rails rest技术
但是存入数据库表的是--\painting --之类的字符串，不符合要求
所以在vendor model中加入
def service_category=(values)
    if !values.nil?
        write_attribute('service_category', values.join(','))
    end
end
def service_category
    if !read_attribute('service_category').nil?
        read_attribute('service_categ ......

Ruby学习笔记一——语言基础

#一、这里是注释，是单行注释，类似于//
puts 3/5#这里是整数形式的结果
puts 3/5.0#这里是小数形式的结果
=begin
这是多行注释，实际上这也是Ruby内嵌文档格式，类似于Java doc
=end不但要有起止，还要缩进才有用。
=end
#二、连行
puts "Hello Ruby!"; puts "This is a "\
"String";#行尾的分号可以省略?‘\’是连行符，行尾即默认为一个语句的结束，可以没有分号，如果不希望它结束但想换行，需要加连行符'\'且之后不能再加行注释。
#三、print,puts,printf
#puts可以加多个参数在后面，每输出一个参数自动加一个换行符，而print不加换行符
puts "%d,%s",100,"string, hello!";
#用格式吕输出有点像C语言风格,用printf
printf "%d,%s",100,"string, hello!";
#四、一些语法知识
#0开头表8进制数，0x开头表16进制数,0b开头表二进制，单引号双引号都可引字符串
#一个数组中的元素可以互不相同，是弱类型语言
#区间：1..5表1，2，3，4，5。1...5表示1，2，3，4
#赋值可用这种形式a,b,c=3,4,5;
#比较运算时。==最弱，只要值相同即可，如1==1.0为真，eql?强一点，需要值为类型相同，如1==1，equal?最强需要两个变量的� ......

Ruby学习笔记二——数组

#一、数组引用
arr=[3,4,5,6,7,8,9]
puts arr[0] #3
puts arr.first #3
puts arr[arr.length-1] #9
puts arr[arr.size-1] #9
puts arr.last #9
puts arr[-1] #9
puts arr[-2] #8
print arr[1..3] ,"\n" #456
print arr[-3,4] ,"\n" #789，从-3开始，打印4个元素，这里只有三个
#Ruby的数组大小是动态的，你能够随时增加、删除数组元素。
print arr.join(", "),"\n" #意思是：将数组arr转换成字符串输出，用", "隔开每个元素，并且换行。
#二、数组编辑
arr=[4,5,6]
print arr.join(", "),"\n" #4, 5, 6
arr[4] = "m" #把4号索引位置元素赋值为"m"
print arr.join(", "),"\n" #4, 5, 6, , m
print arr[3] ,"\n" #打印3号索引位置元素 #nil
arr.delete_at(3) #删除3号索引位置元素
print arr.join(", "),"\n" #4, 5, 6, m
arr[2] = ["a","b","c"] #把2号索引位置元素赋值为["a","b","c"]
print arr.join(", "),"\n" #4, 5, a, b, c, m
print arr[2] ,"\n" #打印2号索引位置元素 #abc
arr[0..1] = [7,"h","b"] #把0..1号元素替换为7,"h","b"
puts arr[0];#由输出可见，元素个数加了一个，即替换之后，成了0..2对应7,h,b
puts arr[1];
puts arr[2];
......

Ruby学习笔记三——类

#一、定义一个类
class Person
  def initialize(name,age=18)
   @name=name;
   @age=age;
   @motherland="china";
  end
  def talk
   puts "my name is "+@name+" and I am "+@age.to_s
   if @motherland == "china"
   puts "I am a Chinese."
   else
   puts "I am a foreigner."
   end
  end#talk结束
  attr_writer:motherland
  attr_writer:age
end#class结束
p1=Person.new("Zhangren",10);
p1.talk;
p1.motherland="abc";
p1.talk;
p1.age=20;
p1.talk;
#二、继承自一个类
class Student < Person
  def talk
   #super;#这会调用父类talk中的代码
   puts "I am a student. my name is "+@name+", age is "+@age.to_s
  end # talk方法结束
end # Student类结束
p3=Student.new("kaichuan",25); p3.talk
p4=Student.new( ......

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