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I want to display a list of articles in my tag's show view. I'm using the acts as taggable redux plugin in a Rails 2.3.2 and SQLite3 app. I've got as far as the basic example takes me, assigning tags and then displaying a list of them with the article.

Now I want to display a list of articles belonging to a tag but get the following error:

undefined method `article' for #<Tag id: 1, name: "various", taggings_count: 1>

Models

/article.rb

class Article < ActiveRecord::Base  
  acts_as_taggable
end

/user.rb 

class Tag < ActiveRecord::Base  
  acts_as_tagger
end

Controller

/tags_contoller.rb

def show
  @tag = Tag.find(params[:id])
  @articles = @tag.articles
end

View

/tags/show.html.erb 

<% for article in @articles %>  
   ...  
<% end %>

Here is a link to the migration file.

Thanks very much.

Nick
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3 Answers3

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I believe the plugin is not the one to blame here, it's sqlite that's bringing you trouble. I encountered this one before - it seems sqlite can't understand 'table_name.column_name' syntax, even though it's not mentioned on the website. In my case I just switched to MySQL, and the whole thing went without a problem. See if this helps.

alex.zherdev
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  • Thanks for the quick response. I've run into trouble getting the MySQL Gem working in Rails 2.3.2. Will let you know if it fixes the above issue. – Nick Jun 20 '09 at 06:02
  • Finally got MySQL working with rails 2.3.2. Unfortunately it did not fix the issue which had more to do with my lack of understanding of the plugin :). – Nick Jun 20 '09 at 16:40
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The problem is that you have a model named Object. Give it a name that has no overlap with Ruby system classes, such as ApplicationObject or MediaObject.

I could speculate on why that's causing the issues it is, but it would only be speculation. Open classes is a wonderful feature of Ruby, but it means you need to be careful naming your classes so they're distinct from Ruby's and Rail's classes.

Sarah Mei
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  • And rename all your references to object, @objects, etc., too. – Sarah Mei Jun 20 '09 at 16:49
  • my apologies, by naming the model object I was giving a general name to the "thing" the being tagged. I've changed "object" to "article" to make this clearer. Thanks for pointing it out. – Nick Jun 20 '09 at 18:06
  • Yeah, now that I think about it, if you actually had a model named Object it would have failed much earlier and more mysteriously. :) – Sarah Mei Jun 21 '09 at 07:08
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Many thanks to Geemus, author of acts as taggable redux for explaining this to me.

To display a list of articles with a specific tag I just needed to change the tags_controller from:

/tags_contoller.rb

def show
  @tag = Tag.find(params[:id])
  @articles = @tag.articles
end

to:

Controller /tags_contoller.rb

def show
  @tag = Tag.find(params[:id])
  @articles = @tag.tagged
end
Nick
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