Rails 3 ------- I have a relationship where Category has_and_belongs_to_many Article. I want to grab a small subsection of articles related to a particular category. When I try to iterate over these, Rails tries to count the records and gets the wrong number.
The issue is that there is bug in the way ActiveRecord counts records in associations. For example: c = Category.first c.articles.count Outputs 8 which is correct. c.articles.limit(3).count Also outputs 8, when it should be 3 The problem is that the SQL ActiveRecord generates, just appends the limit to end of the SQL string: SELECT COUNT(*) AS count_id FROM `articles` INNER JOIN `articles_categories` ON `articles`.id = `articles_categories`.article_id WHERE (`articles_categories`.category_id = 9 ) LIMIT 3 All the limit statement does here is limit the number of output lines: which is always 1. If ActiveRecord generated this, it would work: SELECT count(*) FROM ( SELECT * FROM `articles` INNER JOIN `articles_categories` ON `articles`.id = `articles_categories`.article_id WHERE (`articles_categories`.category_id = 9 ) LIMIT 6, 4) inner_table To correct this I think I'd need to override ActiveRecord::Calculations#count. Is there a better way? If this was just a has_many relationship I could use: Article.where(["category_id = ?", c.id]).limit(3).count but that won't work with a has_and_belongs_to_many because articles doesn't have a category_id field -- Posted via http://www.ruby-forum.com/. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk@googlegroups.com. To unsubscribe from this group, send email to rubyonrails-talk+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
