adhere to rubocop guidelines

app/controllers/application_controller.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'bigbluebutton_api'
 
 class ApplicationController < ActionController::Base
@@ -43,18 +45,18 @@ class ApplicationController < ActionController::Base
 
   # Determines if a form field needs the is-invalid class.
   def form_is_invalid?(obj, key)
-    'is-invalid' if !obj.errors.messages[key].empty?
+    'is-invalid' unless obj.errors.messages[key].empty?
   end
   helper_method :form_is_invalid?
-  
+
   # Default, unconfigured meeting options.
   def default_meeting_options
+    invite_msg = "To invite someone to the meeting, send them this link:"
     {
       user_is_moderator: false,
       meeting_logout_url: request.base_url + logout_room_path(@room),
       meeting_recorded: true,
-      moderator_message: "To invite someone to the meeting, send them this link:\n\n
-        #{request.base_url + relative_root + room_path(@room)}"
+      moderator_message: "#{invite_msg}\n\n #{request.base_url + relative_root + room_path(@room)}",
     }
   end
 end

app/controllers/errors_controller.rb

@@ -1,9 +1,10 @@
+# frozen_string_literal: true
+
 class ErrorsController < ApplicationController
-  
   def not_found
     render status: 404
   end
-  
+
   def unprocessable
     render status: 422
   end

app/controllers/main_controller.rb

@@ -1,6 +1,7 @@
-class MainController < ApplicationController
+# frozen_string_literal: true
 
-  #before_action :redirect_to_room
+class MainController < ApplicationController
+  # before_action :redirect_to_room
 
   # GET /
   def index

app/controllers/rooms_controller.rb

@@ -1,5 +1,6 @@
-class RoomsController < ApplicationController
+# frozen_string_literal: true
 
+class RoomsController < ApplicationController
   before_action :validate_accepted_terms, unless: -> { !Rails.configuration.terms }
   before_action :find_room, except: :create
   before_action :verify_room_ownership, except: [:create, :show, :join, :logout]
@@ -9,7 +10,7 @@ class RoomsController < ApplicationController
   # POST /
   def create
     redirect_to root_path unless current_user
-    
+
     @room = Room.new(name: room_params[:name])
     @room.owner = current_user
 
@@ -19,9 +20,6 @@ class RoomsController < ApplicationController
       else
         redirect_to @room
       end
-    else
-      # Handle room didn't save.
-
     end
   end
 
@@ -29,7 +27,7 @@ class RoomsController < ApplicationController
   def show
     if current_user && @room.owned_by?(current_user)
       @recordings = @room.recordings
-      @is_running = @room.is_running?
+      @is_running = @room.running?
     else
       render :join
     end
@@ -47,7 +45,7 @@ class RoomsController < ApplicationController
       return
     end
 
-    if @room.is_running?
+    if @room.running?
       if current_user
         redirect_to @room.join_path(current_user.name, opts, current_user.uid)
       else
@@ -92,13 +90,13 @@ class RoomsController < ApplicationController
     current_user.main_room = @room
     current_user.save
 
-    redirect_to @room    
+    redirect_to @room
   end
 
   # POST /:room_uid/:record_id
   def update_recording
     meta = {
-      "meta_#{META_LISTED}" => (params[:state] == "public")
+      "meta_#{META_LISTED}" => (params[:state] == "public"),
     }
 
     res = @room.update_recording(params[:record_id], meta)
@@ -124,12 +122,10 @@ class RoomsController < ApplicationController
 
     if len > 60
       "#{len / 60} hrs"
+    elsif len == 0
+      "< 1 min"
     else
-      if len == 0
-        "< 1 min"
-      else
-        "#{len} min"
-      end
+      "#{len} min"
     end
   end
   helper_method :recording_length
@@ -147,7 +143,7 @@ class RoomsController < ApplicationController
 
   # Ensure the user is logged into the room they are accessing.
   def verify_room_ownership
-    bring_to_room if !@room.owned_by?(current_user)
+    bring_to_room unless @room.owned_by?(current_user)
   end
 
   # Redirects a user to their room.

app/controllers/sessions_controller.rb

@@ -1,5 +1,6 @@
-class SessionsController < ApplicationController
+# frozen_string_literal: true
 
+class SessionsController < ApplicationController
   # GET /users/login
   def new
   end
@@ -13,11 +14,8 @@ class SessionsController < ApplicationController
   # POST /users/login
   def create
     user = User.find_by(email: session_params[:email])
-    if user && user.authenticate(session_params[:password])
+    if user.&authenticate(session_params[:password])
       login(user)
-    else
-      # Login unsuccessful, display error message.
-      
     end
   end
 

app/controllers/users_controller.rb

@@ -1,5 +1,6 @@
-class UsersController < ApplicationController
+# frozen_string_literal: true
 
+class UsersController < ApplicationController
   before_action :find_user, only: [:edit, :update]
   before_action :ensure_unauthenticated, only: [:new, :create]
 
@@ -12,7 +13,7 @@ class UsersController < ApplicationController
     @user.provider = "greenlight"
 
     if @user.save
-     login(@user)
+      login(@user)
     else
       # Handle error on user creation.
       render :new
@@ -61,16 +62,13 @@ class UsersController < ApplicationController
         redirect_to edit_user_path(@user), notice: "Information successfully updated."
       else
         # Append custom errors.
-        errors.each do |k, v| @user.errors.add(k, v) end
+        errors.each { |k, v| @user.errors.add(k, v) }
         render :edit
       end
+    elsif @user.update_attributes(user_params)
+      redirect_to edit_user_path(@user), notice: "Information successfully updated."
     else
-      # Update the core user attributes.
-      if @user.update_attributes(user_params)
-        redirect_to edit_user_path(@user), notice: "Information successfully updated."
-      else
-        render :edit
-      end
+      render :edit
     end
   end
 
@@ -83,7 +81,7 @@ class UsersController < ApplicationController
       redirect_to current_user.main_room
     end
   end
-  
+
   private
 
   def find_user