RubyOnRails,Tips,ruby
27 四月 2011 | View Comments
class UrlWriterSingleton
include Singleton
include ActionController::UrlWriter
def self.default_url_options
{:host => 'www.seravia.com'}
end
end
module NameRouteHelper
def self.included(base)
base.send(:include, InstanceMethods)
end
module InstanceMethods
def name_path_for(name, options = {})
UrlWriterSingleton.instance.send("#{name}_path", options)
end
end
end
Usage:
Class TestNamedRouteHelper
include NameRouteHelper
end
TestNamedRouteHelper.new.name_path_for("root")
Tagged in routes, RubyOnRails, Tips
ruby
7 四月 2011 | View Comments
Rspec has a convenient way to write simple test
describe [1, 2, 3, 3] do
its(:size) { should == 4 }
its("uniq.size") { should == 3 }
end
Tagged in rspec, testing, Tips
RubyOnRails
18 十二月 2010 | View Comments
ruby = File.join(*RbConfig::CONFIG.values_at('bindir', 'RUBY_INSTALL_NAME'))
#=> /Users/allen/.rvm/rubies/ree-1.8.7-2010.02/bin/ruby
You can see, there are lot’s of useful info in
Constant RbConfig::CONFIG
Tagged in rbconfig, ruby, Tips
RubyOnRails
10 六月 2010 | View Comments
Find a method in arity
Here is doc from ruby doc
Returns an indication of the number of arguments accepted by a method. Returns a nonnegative integer for methods that take a fixed number of arguments. For Ruby methods that take a variable number of arguments, returns -n-1, where n is the number of required arguments. For methods written in C, returns -1 if the call takes a variable number of arguments.
class C
def one; end
def two(a); end
def three(*a); end
def four(a, b); end
def five(a, b, *c); end
def six(a, b, *c, &d); end
end
c = C.new
c.method(:one).arity #=> 0
c.method(:two).arity #=> 1
c.method(:three).arity #=> -1
c.method(:four).arity #=> 2
c.method(:five).arity #=> -3
c.method(:six).arity #=> -3
"cat".method(:size).arity #=> 0
"cat".method(:replace).arity #=> 1
"cat".method(:squeeze).arity #=> -1
"cat".method(:count).arity #=> -1
Tagged in ruby, Tips
RubyOnRails,Tips
10 六月 2010 | View Comments
Can hash have a default value, when it doesn’t have a key?
Answer is yes!
h = Hash.new("default")
h["wrong_value"] # => "default"
Tagged in hash, ruby, Tips
RubyOnRails,Tips
13 五月 2010 | View Comments
As previous solution doesn’t works, after read source code of ActiveSupport::TestCase I find a final solution.
class ActiveSupport::TestCase
setup :log_test
private
def log_test
unless @already_logged_this_test
puts "\n\nStarting #{@method_name} in class:#{self.class.name}\n#{'-' * (20 + @method_name.length + self.class.name.length)}\n"
end
@already_logged_this_test = true
end
setup is a callback of ActiveSupport::TestCase. So we doesn’t hack anything. It works fine.
And what’s more rake test already support verbose model
rake test:units TESTOPTS="-v"
if you using run test directly like this, TESTOPTS="-v" doesn’t work
ruby -Itest test/units/some_test.rb
Tagged in RubyOnRails, test, Tips
RubyOnRails,Tips
11 五月 2010 | View Comments
How can I know what’s the file name of current ruby file?
Use __FILE__
#file /home/allen/test.rb
puts __FILE__ # => /home/allen/test.rb
# get file name
File.basename(__FILE__) # => "test.rb"
# exclude suffix
File.basename(__FILE__,".rb") # => "test"
#dir name
File.dirname(__FILE__) # => "/home/allen/"
Or
#file /home/allen/test.rb
puts __FILE__ # => /home/allen/test.rb
# get file name
Pathname.new(__FILE__).basename # => "test.rb"
# exclude suffix
Pathname.new(__FILE__).basename(".rb") # => "test"
#dir name
Pathname.new(__FILE__).dirname # => "/home/allen/"
For more API checkout Pathname
Tagged in file, Tips
RubyOnRails,Tips
1 四月 2010 | View Comments
Assuming We have Member model.
And one record with name Hnery Miller, with state draft
I have two conditions:
condition1 = ['name like ?','Hnery%']
condition2 = ['state = ?','draft']
What I gonna do is merge these two conditions, using Rails ActiveRecord buildin method merge_conditions
Member.first(:conditions => Member.merge_conditions(condition1,condition2))
Tagged in active_record, RubyOnRails, Tips
RubyOnRails,Tips
14 二月 2010 | View Comments
- hide_action: hide a method in controller
- helper_method: use this method as helper method, you can call this method in view
class BookController < ActionController::Base
def category_name
"RubyOnRails"
end
hide_action :category_name #you can't visit action category_name.
helper_method :category_name #you can call 'category_name' in view
end
Tagged in actioncontroller, RubyOnRails, Tips
