Fix rubocop errors in app/api & app/channels (#6425)

* Fix rubocop errors in app/api & app/channels

* Fix rubocop guardclause offenses

app/api/srch/search.rb

@@ -103,7 +103,7 @@ class Search < Grape::API
           if results.present?
             docs = results.map do |model|
               DocResult.new(
-                  doc_type: 'USERS',
+                doc_type: 'USERS',
                 doc_url: '/profile/' + model.name,
                 doc_title: model.username,
                 latitude: model.lat,
@@ -181,7 +181,7 @@ class Search < Grape::API
           DocList.new('', search_request)
         end
       end
-        
+
       # Request URL should be /api/srch/nodes?query=QRY
       desc 'Perform a search of nodes', hidden: false,
                                                  is_array: false,

app/channels/application_cable/connection.rb

@@ -4,18 +4,13 @@ class Connection < ActionCable::Connection::Base
     def connect
       self.current_user = find_verified_user
     end
-    
+
     def find_verified_user
-      if cookies.signed['user_token'] != nil
-        user = User.where(persistence_token: cookies.signed['user_token'])
-        if user.any?
-          return user.first
-        else
-          return nil
-        end
-      else
-        return nil
-      end
+      return if cookies.signed['user_token'].nil?
+
+      user = User.where(persistence_token: cookies.signed['user_token'])
+
+      return user.first if user.any?
     end
   end
 end

app/channels/room_channel.rb

@@ -1,6 +1,5 @@
 # This is a general channel connected to all active session
 class RoomChannel < ApplicationCable::Channel
-
   def subscribed
     stream_from "room_channel"
   end
@@ -10,8 +9,8 @@ def unsubscribed
   end
 
   def speak(message)
-    if current_user && current_user.role == "admin"
-      ActionCable.server.broadcast 'room_channel', message: message["message"]
-    end
+    return unless current_user && current_user.role == "admin"
+
+    ActionCable.server.broadcast 'room_channel', message: message["message"]
   end
 end

app/channels/user_channel.rb

@@ -1,6 +1,6 @@
 class UserChannel < ApplicationCable::Channel
   def subscribed
-    if current_user != nil
+    if !current_user.nil?
       stream_from "users:#{current_user.id}"
     else
       reject

app/channels/user_notification_channel.rb

@@ -1,6 +1,6 @@
 class UserNotificationChannel < ApplicationCable::Channel
   def subscribed
-    if current_user != nil
+    if !current_user.nil?
       stream_from "users:notification:#{current_user.id}"
     else
       reject