Add ability to download user lists as CSV

* Global and chapter lists can be downloaded as CSV
* Still need to add to the interface

app/controllers/users_controller.rb

@@ -4,7 +4,15 @@ class UsersController < ApplicationController
   before_action :ensure_current_user_or_admin, :only => [:update, :edit]
 
   def index
-    @users = User.all_with_chapter(params[:chapter_id]).paginate(page: params[:page], per_page: 250)
+    @users = User.all_with_chapter(params[:chapter_id])
+
+    respond_to do |format|
+      format.html do
+        @users = @users.paginate(page: params[:page], per_page: 250)
+      end
+      format.csv do
+      end
+    end
   end
 
   def update

app/views/users/index.csv.erb

@@ -0,0 +1,4 @@
+<%= CSV.generate_line %w[id first_name last_name email url chapter_name role created_at updated_at] -%>
+<%- @users.each do |user| -%>
+  <%= CSV.generate_line [user.id, user.first_name, user.last_name, user.email, user.url, user.chapter_name, user.role_name, user.created_at.to_s(:iso8601), user.updated_at.to_s(:iso8601)] -%>
+<%- end -%>

spec/controllers/users_controller_spec.rb

@@ -1,13 +1,25 @@
 require 'spec_helper'
 
-describe UsersController do
+describe UsersController, type: :controller do
   context "signed in as admin user" do
+    render_views
+
     let(:user) { FactoryGirl.create(:user, :admin => true) }
     before do
       sign_in_as user
-      get :index
     end
-    it { is_expected.to respond_with(:success) }
+
+    context "fetching an HTML file" do
+      before { get :index }
+      it { is_expected.to respond_with(:success) }
+      it { should render_template("index") }
+    end
+
+    context "fetching a CSV file" do
+      before { get :index, format: "csv" }
+      it { is_expected.to respond_with(:success) }
+      it { should render_template("index") }
+    end
   end
   context "signed in as non-admin user" do
     let(:role) { FactoryGirl.create(:role) }