delay method.
Second way to create DelayedJob records is custom jobs.
]]>My ruby version 1.9.2.
First I’m going to show you how to add methods to instances by using define_method.
You can also write an instance method to create instance methods. send must be used because define_method is private.
Write a singleton method to create instance methods.
Now it is time to add singleton methods. When we call define_method, it creates an instance method. What we have to do is call define_method on class’ singleton class.
Getting singleton class of a class:
First defining singleton method to create singleton methods.
Then defining instance method to create singleton methods.
]]> accepts_nested_attributes_for with has_one relation.
Assume that we have a Book model which has one Author.
Controller :
View:
No special action is needed for create method of BooksController, attr_accessible is not necessary for Book model. Just don’t forget to add the second parameter (@book) of form_for and build your nested object (@book.build_author).
Array("string") behaves:
irb(main):001:0> Array("izzet emre \nkutlu")
=> ["izzet emre \n", "kutlu"]
This output is not what most of the people expected. Be careful!
]]>/.gem/ruby/1.8/gems/activesupport-2.2.2/lib/active_support/dependencies.rb:445:in
`load_missing_constant': uninitialized constant Inflector (NameError)
As I learned from Paul’s post usage of Inflector class is changed a bit. You can see the difference when you compare the inflections.rb files. Path of the file is yourApp/config/initializers/inflections.rb
inflections.rb (Rails 2.1.0)
Inflector.inflections do |inflect|
.
.
.
end
inflections.rb (Rails 2.2.2)
ActiveSupport::Inflector.inflections do |inflect|
.
.
.
end
In my situation changing Inflector to ActiveSupport::Inflector was enough to solve the problem.
This is what happened when I want to install rmagick gem.
username@username-desktop:~$ sudo gem install rmagick
Bulk updating Gem source index for: http://gems.rubyforge.org/
ERROR: could not find rmagick locally or in a repository
What the hell… After some googling I found that RubGems 1.1.x is buggy and and update to RubyGems 1.2 is necessary. To learn your RubyGems version:
username@username-desktop:~$ gem -v
1.1.0
I try to update RubyGems :
username@username-desktop:~$ sudo gem update --system
Updating RubyGems
Bulk updating Gem source index for: http://gems.rubyforge.org/
Nothing to update
After this failed attempt, I realized that RubyGems 1.1.x is really buggy. So I must go on manually to update RubyGems.
Now the solution:
username@username-desktop:~$ cd Desktop/
username@username-desktop:~/Desktop$ sudo gem install rubygems-update-1.2.0.gem
username@username-desktop:~$sudo update_rubygems
To check if our process is successful :
username@username-desktop:~$gem -v
1.2.0
If you see 1.2.0, you did it.
]]>
def comic(cast)
cast.each do |character|
unless character.is_a?(Array)
yield(character)
else
comic(character) {|x| yield x}
end
end
end
This method takes an array as argument and checks each element if it is an Array. If the element is not an Array then the block is called. If the element is an Array then the same method is called with that element as an argument and with the same block.
Now let’s look how we can call this method.
names = ['lucky luke', 'jolly jumper', 'rin tin tin', ['joe', 'william','jack', 'averell']]
comic(names) {|c| puts c}
Output :
lucky luke
jolly jumper
rin tin tin
joe
william
jack
averell
]]>
<body>
<div id='main'>
Main Div
</div>
</body>
render :update do |page|
page << "if ($('main')){"
page.replace_html 'main', :inline => 'Here it is'
page << "}"
end
This ruby code checks if there is a DOM object that its id = “main”. If there is then changes its content to “Here it is”, if there is not do nothing.
]]>