# Buttons for a drop-down list

**URL:** <https://www.ruby-forum.com/t/buttons-for-a-drop-down-list/123388>\
**Category:** Rails\
**Created:** [December 17, 2007, 10:35am UTC](https://www.ruby-forum.com/t/buttons-for-a-drop-down-list/123388 "2007-12-17T10:35:22Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Thufir](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/ee7513/32.png) [@Thufir](https://www.ruby-forum.com/u/Thufir)\
**Post date:** [December 17, 2007, 10:35am UTC](https://www.ruby-forum.com/t/buttons-for-a-drop-down-list/123388/1 "2007-12-17T10:35:22Z")

</div>

The “show” for a row from feeds works correctly, showing both rows  
which that feed row. However, I’d like to add a “add” button (and a  
“remove”?) to the “Editing feed” page so that the the rows from  
categories will be associated/unassociated with that feeds row.

(There’s a many-to-many relationship between “feeds” and  
“categories”.)

Feed: feed1  
Edit | Back  
Itemized Categories  
cat1  
category2

[http://localhost:3000/feeds/show/1](http://localhost:3000/feeds/show/1)

Feed: feed2  
Edit | Back

[http://localhost:3000/feeds/show/2](http://localhost:3000/feeds/show/2)

Editing feed

Feed

Category  
Show | Back

[http://localhost:3000/feeds/edit/1](http://localhost:3000/feeds/edit/1)

thufir@arrakis ~/Desktop/strawr $  
thufir@arrakis ~/Desktop/strawr $ tail app/views/feeds/show.rhtml –  
lines=13

\<% if @feed.has\_categories? %\>

### Itemized Categories
 \<% for category in @feed.categories %\> \<% end %\> 

| \<%= category.category %\> |

\<% end %\>

thufir@arrakis ~/Desktop/strawr $  
thufir@arrakis ~/Desktop/strawr $ tail app/views/feeds/\_form.rhtml –  
lines=2

Category  
\<%= select("post", "category\_id", Category.find\_all.collect {|c| [c.category, c.id]}) %\> thufir@arrakis ~/Desktop/strawr $

thanks,

Thufir