Uninitialized Tag constant in Rails 3 with Acts_As_Taggable_On

Question

This controller action worked perfectly in Rails 2.3.x:

def show
  @title = Tag.find(params[:id]).name
  @tag = Tag.find(params[:id])
  @messages = Post.paginate(Post.find_tagged_with(@tag), 
              :page => params[:page], :per_page => 10, :order => "updated_at DESC")
  @related_tags = @related_entries.collect{|x|x.tags}.flatten.uniq
  @related_tags.delete(@tag)
end

But while migrating my application to Rails 3 I run into this error in Tags#show:

uninitialized constant TagsController::Tag

It's not liking the Tag constant. Has anyone else had this issue?

I'm using Rails 3.0.0RC and Ruby 1.9.2.

Anyone know whats going on here? – 66tree Aug 26 '10 at 20:55 — 66tree, Aug 26 '10 at 20:55

score 12 · Accepted Answer · answered Aug 27 '10 at 14:21

12

Try including the complete namespace e.g.

@title = ActsAsTaggableOn::Tag.find(params[:id]).name

answered Aug 27 '10 at 14:21

Paul Groves

3,983
2
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Very helpful! but its obviously a lot to type. is there an easy way to configure it so you can just refer to "Tag"? – Phil_Ken_Sebben Jan 20 '11 at 00:38

score 10 · Answer 2 · answered Feb 01 '11 at 00:31

10

You can also define the model in your app:

# app/models/tag.rb
class Tag < ActsAsTaggableOn::Tag
end

# app/models/tagging.rb
class Tagging < ActsAsTaggableOn::Tagging
end

answered Feb 01 '11 at 00:31

Andy

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This is by far the best solution. Every app should do this. (This just saved us from a Ruby 1.9.3 issue) – ndbroadbent Jan 11 '12 at 06:54

Uninitialized Tag constant in Rails 3 with Acts_As_Taggable_On

2 Answers2