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    <p><strong>Update:</strong> Way to access current_user and current_company rails methods in ember app described at bottom of answer and the <a href="https://github.com/blangslet/ember.js-rails-devise-demo" rel="nofollow noreferrer">github demo app</a> has also been updated.</p> <hr> <p>If I understand correctly what you're trying to do, below is one way to get the job done quickly. If anyone has a better answer, please edit my question. I have put up on <a href="https://github.com/blangslet/ember.js-rails-devise-demo" rel="nofollow noreferrer">github an ember + rails + devise demo app</a> that combines the answer to this question and <a href="https://stackoverflow.com/questions/14601092/ember-js-sorting-and-filtering-children-of-a-hasmany-relationship-in-parent-rout">my last ember.js stackoverflow question</a> to show that everything is working as it should be. Below I use the model Post instead of Article, but it's basically the same concept.</p> <p>1) In the Rails Companies view, on specific company link_to click, you should pass the company variable to a rails controller action that's passed onward to an application helper method to set a devise session variable for current_company. </p> <pre><code>&lt;% @companies.each do |company| %&gt; &lt;%= link_to 'Company Dashboard', set_current_company_company_path(:id =&gt; company) %&gt; &lt;% end %&gt; class CompaniesController &lt; ApplicationController def set_current_company session[:company_id] = params[:id] redirect_to assets_path end ... end class ApplicationController &lt; ActionController::Base ... helper_method :current_company def current_company @current_company ||= Company.find_by_id!(session[:company_id]) end ... end App::Application.routes.draw do resources :companies do member do get :set_current_company end end ... </code></pre> <p>The set_current_company method will set the current_company variable session-wide and redirect the user to the assets/index.html.erb rails view that contains your ember application. </p> <p>2) You now need to scope your rails api data for Posts (and Comments, Company_Memberships) for current_company that you want to use in your json api/ember models, like so: </p> <pre><code>class PostsController &lt; ApplicationController def index @posts = Post.where(company_id: current_company.id) render json: @posts end def create @post = Post.new(params[:post].merge :company_id =&gt; current_company.id) respond_to do |format| if @post.save render json: @post, status: :created, location: @post else render json: @post.errors, status: :unprocessable_entity end end end </code></pre> <p>3) Then you should serialize the data through AMS to the ember app in a normal way:</p> <pre><code>class PostSerializer &lt; ActiveModel::Serializer attributes :id, :title, :body, :company_id, :user_id has_many :comments end </code></pre> <p>4) Then on to the ember model. </p> <pre><code>App.Post = DS.Model.extend({ title: DS.attr('string'), body: DS.attr('string'), comments: DS.hasMany('App.Comment') }); </code></pre> <p>5) Ember Controllers, Views and templates should behave as expected. Check out the <a href="https://github.com/blangslet/ember.js-rails-devise-demo" rel="nofollow noreferrer">demo app</a> to see super basic implementations.</p> <hr> <p>In order to gain access to current_user and current_company, use <a href="https://github.com/rails-api/active_model_serializers#attributes" rel="nofollow noreferrer">active_model_serializers meta data serialization</a> and then <a href="https://stackoverflow.com/questions/14322945/accessing-meta-information-passed-in-a-json-server-response/14357404#14357404">this guy's temporary solution</a> to map your serializer so that it grabs the meta data and sets it to a global variable in your ember app. This may not be best practices, but for now, it gets the job done.</p> <p>1) First, set your store.js grab the meta data from your json and set it to a global variable in your serializer: </p> <pre><code>App.CustomRESTSerializer = DS.RESTSerializer.extend({ extractMeta: function(loader, type, json) { var meta; meta = json[this.configOption(type, 'meta')]; if (!meta) { return; } Ember.set('App.metaData', meta); this._super(loader, type, json); } }); App.Store = DS.Store.extend({ revision: 11, adapter: DS.RESTAdapter.create({ bulkCommit: false, serializer: App.CustomRESTSerializer }), }); App.ready = function() { App.CompanyMembership.find(); } </code></pre> <p>2) Second, in your rails company_memberships_controller.rb render the meta data:</p> <pre><code>render json: @company_memberships, :meta =&gt; {:current_user =&gt; current_user, :current_company =&gt; current_company} </code></pre> <p>3) Finally, call any current_user or current_company attribute straight from your templates:</p> <pre><code>Logged in with: {{App.metaData.current_user.email}} &lt;br&gt; Current Company: {{App.metaData.current_company.name}} </code></pre>
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    1. PORails + Ember.js + Devise freelance journalist app - data scoping
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    1. COWoah, this is awesome man, thanks so much!! Everything looks good on this end!
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    2. COExample app showing authentication with emberjs and devise including accessing curent_user in the ember app: **https://github.com/kagemusha/ember-rails-devise-demo**
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    3. CObrg - nice find! The only problem with the approach kagemusha has taken is to handle user authentication and the majority of data scoping within ember client javascript itself. I believe that this leads to unnecessarily complex ember apps - user auth and other basic data pages should be handled server-side, while ember should do the heavily-interactive-ui lifting, no? I look forward to @Bryan's answer about how to access current_user, current_company and other rails methods within ember apps purely for ember app display reasons and not in-ember data scoping.
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