http://snippets.dzone.com/posts Sun, 07 Sep 2008 22:49:30 GMT DZone Snippets: rails code http://snippets.dzone.com/posts/show/5266 This goes in whatever model you're validating. "Subject" can be any of the symbols in your model and doesn't need the : in front of it. <br /><code> <br />def validate <br /> if subject.split.any?{|w| w.length > 26} <br /> errors.add(:subject, "cannot have words more than 26 consecutive characters") <br /> end <br />end <br /></code> Fri, 21 Mar 2008 19:40:38 GMT http://snippets.dzone.com/posts/show/5266 ioda006 () http://snippets.dzone.com/posts/show/1919 You should have a categories table with a parent_id field. Root categories should have the parent_id of 0. <br /> <br />I modified this post: <br />http://www.bigbold.com/snippets/posts/show/296 <br /> <br />because the first one worked if you did stuff in your view to make the root categories come up, but I agree with the commenter that things should be contained to the helper - however I've managed to break the DRY rule in doing so. If anyone has any suggestions for a better way around this I'd love to hear it, so please comment. So anyway.. this should list your root categories ONLY and NOT your other sub-cats as well so that you have a very pretty little tree. <br /> <br />Slap this in your view: <br /> <br /><code> <br /><%= display_categories(@categories) %> <br /></code> <br /> <br />And put this in a helper file. You'll need it in the application helper most likely since you'll want to call it from multiple views. <br /> <br /><code> <br /> def display_categories(categories) <br /> ret = "<ul>" <br /> for category in categories <br /> if category.parent_id == 0 <br /> ret += "<li>" <br /> ret += link_to category.name <br /> ret += find_all_subcategories(category) <br /> ret += "</li>" <br /> end <br /> <br /> end <br /> ret += "</ul>" <br /> end <br /> <br /> def find_all_subcategories(category) <br /> if category.children.size > 0 <br /> ret = '<ul>' <br /> category.children.each { |subcat| <br /> if subcat.children.size > 0 <br /> ret += '<li>' <br /> ret += link_to h(subcat.name), :action => 'edit', :id => subcat <br /> ret += find_all_subcategories(subcat) <br /> ret += '</li>' <br /> else <br /> ret += '<li>' <br /> ret += link_to h(subcat.name), :action => 'edit', :id => subcat <br /> ret += '</li>' <br /> end <br /> } <br /> ret += '</ul>' <br /> end <br /> end <br /></code> Sun, 16 Apr 2006 15:32:57 GMT http://snippets.dzone.com/posts/show/1919 ioda006 ()