named scope conditions eager loaded warning

http://jitu-blog.blogspot.com/2009/07/looking-into-rails-namedscope.html

[shared] range overlap check

overlap = !((end2 < start1) || (start2 > end1))

r = Range.find_all(:conditions => ["NOT ((end < ?) || (start > ?))", new_start, new_end])

overlap = r.present?
number_of_overlaps = r.length

dynamic form with accept_nested_attributes

http://railsforum.com/viewtopic.php?id=28447

jQuery ExtendedHelper

http://code.google.com/p/jquery-extendedhelper/

jQuery hash merge

merge hash2 to hash1:

$.extend(hash1, hash2);

for recursive merge:

$.extend(true, hash1, hash2);