Google Sites with mobile template. Codeaholics HK website

we just finished one meetup last night. enjoyed it so much. try my best to promote it to more coders in Hong Kong ~

to get some more web presence for Codeaholics HK meetup, I created a Google Sites with the mobile template:
https://sites.google.com/site/codeaholicshk/

Hong Kong IT Event Calendar update

I help maintaining the Hong Kong Web and Tech Meetup calendar. http://tinyurl.com/hkitcal

If you are organizing or attending any tech events in Hong Kong, email me and I will update the calendar asap. tatonlto [at] gmail.com

Notes when using Eager Loading on Polymorphic relationship

Eager Loading on Polymorphic calls
After checking the Rails API, it is confirmed that eager loading on polymorphic column works. "Eager loading is supported with polymorphic associations." Rails API

My eager loading is a deep hierarchy of associations (people -> reference -> source). so my scope is something like this:

@people = People.includes([:comments, {:reference => :source}])

Problem 1
However, when I use the @people in the view some of them work as expected but some of them throws EagerLoadPolymorphicError:

ActiveRecord::EagerLoadPolymorphicError: Can not eagerly load the polymorphic association :reference

To solve this, usually a loading trigger before the method call would solve it. For example, calling #first, #last or #any


Problem 2
After finish the each loop on @people in the view, I call a function which is a scoped summation function, e.g. #self.total_membership_fees. And this line throws the EagerLoadPolymorphicError !
the loop works fine but the scoped class function does not.

It is like the @people active record relationship is an immutable object which has to preload in every scope.


To solve this, I could do self.any? before self.sum(&:membership_fee). but I simply use another scoped object for calculating the total, before my total_x method does not requires the polymorphic relationships.


Hope it helps clarifying your problem too.

ssh ForwardAgent yes not working (SOLVED!)

I am using MacOS.
I was able to use ssh with id_rsa public key authentication and do something in remote server with "ForwardAgent yes".

But then I setup my new machine, I regenerate keys, copied over to remote server, it doesn't work. I can still authenticate into the server successfully, just that I could not see the behavior of ForwardAgent. the path of the config file is correct, content exactly the same.

After few tests, found out that I should have passphrase for the ssh key pairs, so that the "ForwardAgent yes" would work as expected.

I could not find this requirement for ForwardAgent usage on the internet after few google search. Please redirect me to the documentation, in case any of you found it.

Codeaholics June 2011 Meetup

http://www.facebook.com/event.php?eid=230262926999715

coding knowledge sharing meetup. Open to public, *FREE* of charge.

* * * * * * * * * Speakers * * * * * * * * *
= William Taysom
= An Introduction to Haskell - Part 2

= Shravan Gurrala
= iOS and Objective C

= Matthew Rudy
= "Javascript Web Applications"


* * * * * * * * * Sponsors * * * * * * * * *

= Venue by boot.hk
= 19/f, Hang Wai Commercial Building, 231-233 Queen's Road East, Wan Chai

= Beer by Thought Sauce
= http://thought-sauce.com/

灣仔Mac Book 維修整機非常掂。旺角Pxxxxxx完全唔掂

上星期拎左部MAC BOOK PRO去旺角電腦中心一樓Pxxxxxx整，過左幾日打去問都話唔知咩事。日日打去問都話師父未番，師父話唔知咩事，遲D打番俾你啦（無覆過電話）。我等左個幾星期(10日)之後就叫佢SHIP番黎，唔駛佢整。

今日LUNCH拎去灣仔298三樓，講完症狀，師父已經估到CABLE有事。二十分鐘（連吹水同處理四五個客戶查詢）唔駛就攪掂。

強列推薦香港灣仔298三樓347店（O係最入最角落位置）GreenMac SIMON。

Hope Google Group Mailing List supports +1 (PLUS ONE)

sometimes I saw some funny jokes in google group mailing list, I really want to support/push by facebook "like" or google "+1"

so bad that it is not open source and I could not plug my idea into it. Socializing public group discussion sounds fun.