ancestry

I am doing it this way: @disabled_options = [] Category.where('ancestry is NULL').each do |cat| @disabled_options << cat.id if cat.has_children? end Is there any more elegant way to get all parent without children? Category.where("id IN (SELECT parent_id FROM categories)") Assuming parent_id is a field pointing to the parent category. This will select those categories that are pointed to using "parent_id", so if there's a child, the child will have "parent_id" set, therefore the category referenced to by "parent_id" has children. This one-liner may help you. Category.where(id: Category.pluck(

Only mentions Rails 3 in the GitHub documentation - does anyone know if it's compatible with Rails 4? I ask because it looks like it's been updated to handle Ruby 2.1.0 According to the travis build , tests pass with active record 4. Indeed, it works. We've been using it in one of our recent projects. You can also look at travis.yml file in the repo. It was tested to work with ActiveRecord 4.0. Yes it's compatible with Rails 4, but you need to add :parent_id to permit params in your controller. 来源： https://stackoverflow.com/questions/21333218/does-the-ancestry-gem-work-with-rails-4

I am using the ancestry gem in rails to nest some comments, and what I wanted was for you to be able to get all comments and then have them all nested. How ever I get the following when I put: @comments = post.comments.arrange_serializable into my comments controller index action and get the following result: { "comments":[ { "id":3, "comment":"284723nbrkdgfiy2r84ygwbdjhfg8426trgfewuhjf", "author":"asdasdasdas", "post_id":268, "ancestry":null, "created_at":"2014-06-17T19:23:04.667Z", "updated_at":"2014-06-17T19:23:04.667Z", "children":[ { "id":4, "comment":

I use ancestry to make a tree of goals. I would like to send the contents of that tree to the browser using json. My controller is like this: @goals = Goal.arrange respond_to do |format| format.html # index.html.erb format.xml { render :xml => @goals } format.json { render :json => @goals} end When I open the json file, I get this output: {"#<Goal:0x7f8664332088>":{"#<Goal:0x7f86643313b8>":{"#<Goal:0x7f8664331048>":{"#<Goal:0x7f8664330c10>":{}},"#<Goal:0x7f8664330e68>":{}},"#<Goal:0x7f86643311b0>":{}},"#<Goal:0x7f8664331f70>":{},"#<Goal:0x7f8664331d18>":{},"#<Goal:0x7f8664331bd8>":{},"#<Goal

I'm using Ember 1.5, Ember-Data 1.0.0-beta.7 and the ancestry gem. I have a model with a parent and ancestors , but any model entries that have a parent or ancestor get this weird error and fail. Error: Ember Inspector ($E): Error: No model was found for 'ancestor' at new Error (native) at Error.Ember.Error (http://localhost:8080/assets/ember.js?body=1:911:19) at Ember.Object.extend.modelFor (http://localhost:8080/assets/ember-data.js?body=1:9808:33) at JSONSerializer.extend.extractSingle (http://localhost:8080/assets/ember-data.js?body=1:3021:28) at superWrapper [as extractSingle] (http:/