add users controller and intermediate username step

app/controllers/landing_controller.rb

@@ -19,7 +19,7 @@ class LandingController < ApplicationController
     @room_name = params[:name]
     @user = User.find_by(username: @room_name)
     @meeting_token = @room_name
-    @resource = params[:resource]
+    @resource = "rooms"
     @resource_url = room_url(@meeting_token)
     if @user.nil?
       redirect_to root_path

app/controllers/sessions_controller.rb

@@ -1,8 +1,14 @@
 class SessionsController < ApplicationController
   def create
     @user = User.from_omniauth(request.env['omniauth.auth'])
-    session[:user_id] = @user.id
-    redirect_to controller: 'landing', action: 'room', name: @user.username
+    if @user.persisted?
+      session[:user_id] = @user.id
+      redirect_to controller: 'landing', action: 'room', name: @user.username
+    else
+      @user.save!
+      session[:user_id] = @user.id
+      redirect_to controller: 'users', action: 'edit', id: @user.id
+    end
   rescue => e
     logger.error "Error authenticating via omniauth: #{e}"
     redirect_to root_path

app/controllers/users_controller.rb

@@ -0,0 +1,31 @@
+class UsersController < ApplicationController
+  before_action :set_user, only: [:edit, :update]
+
+  # GET /users/1/edit
+  def edit
+  end
+
+  # PATCH/PUT /users/1
+  # PATCH/PUT /users/1.json
+  def update
+    if @user.update(user_params)
+      redirect_to controller: 'landing', action: 'room', name: @user.username
+    else
+      render :edit
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_user
+      @user = User.find(params[:id])
+      if @user.username
+        raise ActionController::RoutingError.new('Not Found')
+      end
+    end
+
+    # Never trust parameters from the scary internet, only allow the white list through.
+    def user_params
+      params.require(:user).permit(:username)
+    end
+end