Max Ivak Personal Site - Latest Comments

Re: REST vs XML-RPC vs SOAP – pros and cons

Vikram — Fri, 11 May 2012 02:12:35 -0000

Nice article, keep posting !

Re: Memcached with Windows

Guest — Thu, 19 Apr 2012 03:35:33 -0000

there is no latest win32 binaries of memcached in the above links

Re: Dynamic URL Rewriting on ASP.NET MVC

Mohanjerry1 — Thu, 29 Mar 2012 02:46:21 -0000

very helpful! Thanks.

Re: Installing mysql2 gem on Ruby 1.9.2 and Rails 3.0.5 on Windows

Ernests Dreimanis — Fri, 16 Mar 2012 04:49:57 -0000

thanks this was helpfull !

Re: Ruby metaprogramming and own custom attr_accessor

maxivak — Sun, 11 Mar 2012 13:47:33 -0000

paste your code somewhere to see it.
For example, use http://pastebin.com/

Try to use it without an initializer:

class Foo
attr_accessor_with_history :bar
end

f = Foo.new
f.bar = 3
f.bar = :wowzo
f.bar = 'boo!'
puts f.bar_history # => [nil, 3, :wowzo, 'boo!']

Re: Ruby metaprogramming and own custom attr_accessor

Sarah H — Sun, 11 Mar 2012 00:54:26 -0000

I'm struggling to get this code to work for me. I tried to integrate the ideas into my code but couldn't get it to work. Finally I just copied everything you have and put it into my .rb file but I keep getting the Invalid number of arguments for the initialize method. Any ideas?

Re: Ruby metaprogramming and own custom attr_accessor

maxivak — Fri, 09 Mar 2012 14:34:03 -0000

@#{attr_hist_name} ||= [nil] - that's more Ruby way for initializing a variable. thank you.

I can't think of any reason for initializating the history with [nil] instead of just empty array []. I was asking the same question. Why?

Re: Ruby metaprogramming and own custom attr_accessor

orlandodelaguila — Fri, 09 Mar 2012 10:09:42 -0000

i was doing this homework too.. but i dont see why theres the need to put nil inside the array in

@#{attr_hist_name} = [nil] if @#{attr_hist_name}.nil?

i know its a requirement.... but why?

and in that piece of code you could use something like this

@#{attr_hist_name} ||= [nil]

that will set attr_hist_name to [nil] only if attr_hist_name.nil?.. much more like the if you have but a lil more clean..

Re: Ruby metaprogramming and own custom attr_accessor

maxivak — Sun, 04 Mar 2012 17:41:28 -0000

I see these points
- The class which has this instance variable must have the ability to change this variable directly.
It must be some way to change the value directly. This way is @varname = value.
- In order to do something more while changing the value of variable - that's what methods like getters/setters are about.

- To be 100% sure you don't change the value of variable without changing the history then I would think of this OOP technique:
1. define a super (parent) class whose job is
define an instance variable as private, define getter/setter to track the history
2. in a derived class:
access the variable only by getters/setters.

BUT! It is Ruby..
Ruby doesn't provide visibility control over variable. Ruby allows too much to do with classes like reopening classes.. So it is your responsibility how you use Ruby's cool stuff.

We can think what we want to see new to Ruby.
But I don't think it would be a good way for Ruby to add some metaprogramming feature to modify the behaviour of this assignment operator: @var = value. I feel that Ruby introduced @-sign intentionally and specially for accessing the variable directly.

Re: Ruby metaprogramming and own custom attr_accessor

Josephquigley — Sun, 04 Mar 2012 13:14:19 -0000

Yes, thanks very much. That seems like a nice strategy, but I was looking for a way to leave the standard ruby initialize syntax in place, but still track values. I just haven't been able to think of a way that works.

Re: Ruby metaprogramming and own custom attr_accessor

maxivak — Sun, 04 Mar 2012 03:37:54 -0000

anytime you want to change @bar's value you need to use its setter, but do not modify @bar directly. Otherwise it breaks the logic.

So instead of this

def initialize(value)
@bar = value
end

write this:

def initialize(value)
self.bar= value
end

it will call the setter that tracks a history.

Re: Ruby metaprogramming and own custom attr_accessor

Josephquigley — Sun, 04 Mar 2012 01:02:17 -0000

Thanks very much for these examples. Regarding attr_accessor_with_history. What if the class were set up like this?

class Foo
attr_accessor_with_history :bar

def initialize(value)
@bar = value
end

end
f = Foo.new(4)
f.bar = 3 # => 3
f.bar = :wowzo
p f.bar_history

#we lose the initial value of bar which was set to 4
#Thoughts? I would think we would want to capture the initial value of bar => '4'

#Thanks!

Re: Difference between bounce rate & exit rate (Google Analytics)

Serge — Fri, 24 Feb 2012 19:35:12 -0000

Excellent explanation and example. Thanks for that a lot!

Re: Entity Framework vs LINQ to SQL

Chennoufialwalid — Thu, 16 Feb 2012 06:32:24 -0000

Thanks, God bless you

Re: Bootstrap toolkit from Twitter : Overview

maxivak — Sat, 07 Jan 2012 03:47:00 -0000

You are right. Bootstrap from Twitter has only a few examples for layout.

I do CSS in my sites as follows:

1. Layout
Get CSS for layout from here:
http://blog.html.it/layoutgala...

For example, if you need fluid 3-column layout with fixed secondary columns then try this demo:
http://blog.html.it/layoutgala...

but be careful to test that layout in different browsers.
Also they have some little problems. For example, when you make the width of the page in browser very small - it breaks the second column and makes its width too small. The solution to this problem - add "min-width: XXpx;" to the style.
So I had to fix it a little in my sites.

Also, for layouts take a look at YAML framework.
http://www.yaml.de/fileadmin/e...
But most of their examples, have a fixed width of the page and I didn't use YAML much in my sites.

2. CSS for page elements
Then use CSS for all elements from Twitter Boostrap.
They have good structure in CSS code so you can just copy what you need.
Usually, I copy CSS for forms, buttons, pagination, alerts/messages.

3. Typography
For a good typography for a text on page I use Blueprint Framework:
http://www.blueprintcss.org/

Here is the demo:
http://www.blueprintcss.org/te...

But I choose forms from Bootstrap in preference to forms from Blueprint.

Re: Bootstrap toolkit from Twitter : Overview

Anne — Fri, 06 Jan 2012 14:00:11 -0000

Hi Max,
I am looking for a good framework and thought I had settled on Bootstrap but it seems to be lacking a lot. Like fluid three column layouts. Have you found another framework that you like better than Bootstrap?

Anne

Re: Entity Framework vs LINQ to SQL

Sharma Navin24 — Mon, 12 Dec 2011 07:26:46 -0000

Nice read.

Re: Difference between bounce rate & exit rate (Google Analytics)

Shayne Cuffy — Fri, 09 Dec 2011 05:01:21 -0000

Still need to get my head around this a bit more, but thanks, this helped me out a lot:)

Re: Entity Framework vs LINQ to SQL

Bonakkid — Wed, 30 Nov 2011 20:52:43 -0000

Great post. "Entity Framework is more robust and is the way Microsoft is going"...I'll go for this one.

Re: Entity Framework vs LINQ to SQL

буркин ваня — Wed, 30 Nov 2011 20:42:58 -0000

пасибос!!! помоглос в работе-с!!!

Re: Entity Framework vs LINQ to SQL

jquerybyexample — Mon, 21 Nov 2011 04:37:29 -0000

Great Article.. I was looking this content only from last 5 days.. Thanks a ton..