This is a copy/paste from my question over at
StackOverflow<http://stackoverflow.com/questions/5750963/implementing-a-tagging-system-in-rails>so
feel free to answer there if you want some reputation.
I'm trying to implement a tagging system in a Rails app similar to the one
StackOverflow uses (where users enter in tags in a freeform textbox). I'm
aware that there are gems that can do this, but I wanted to try to implement
it myself for the learning experience. I got it to work, but since I'm a
Rails newbie I'm concerned I'm not doing it the "right way".
Here's my current implementation:
def Post
attr_accessor :tag_names
has_and_belongs_to_many :tags
after_save :update_tags
private
def update_tags
tags.delete_all
if tag_names.to_s == ''
return
end
tag_names.split(/,/).each do |tag_name|
tag_name.strip!
tag = Tag.find_or_create_by_name(tag_name)
if !tags.exists?(tag.id)
tags << tag
end
end
end
end
This makes it easy for me to set up the tags for a post since all I have to
do is set the "tag_names" attribute on my post object. When I save the post
object, the after_save event fires and executes my update_tags function
which then handles creating tags and linking the post to them.
Are there any problems with my implementation?
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