# 3rd cascaded Dropdown - help

**URL:** <https://www.ruby-forum.com/t/3rd-cascaded-dropdown-help/145077>\
**Category:** Rails\
**Created:** [August 5, 2008, 8:01pm UTC](https://www.ruby-forum.com/t/3rd-cascaded-dropdown-help/145077 "2008-08-05T20:01:06Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tomtt](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/e47c2d/32.png) [@tomtt](https://www.ruby-forum.com/u/tomtt)\
**Post date:** [August 5, 2008, 8:01pm UTC](https://www.ruby-forum.com/t/3rd-cascaded-dropdown-help/145077/1 "2008-08-05T20:01:06Z")

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Hi, i have 2 Dropdowns, and they depend from each other(has\_many).  
i used collection\_select, observe\_field to create the second dropdown,  
which gets populated correctly. Now i would like to have the 3rd one,  
which is of course as well depending from the second one.  
the solution i use is calling a action from the controller, where my  
variable gets created @…Find… and i call then a partial. i would like  
to extend the partial to contain the same code as the initial page eg.:  
the collection\_select part and the observer as well the div-area where  
it gets finally replaced.  
any ideas why this is not happening?

thx in advance

tom