Corrected with rubocop cop 'Lint/Eval'.

.rubocop.yml

@@ -209,7 +209,5 @@ Lint/UnreachableCode:
   Enabled: false
 Lint/ShadowingOuterLocalVariable:
   Enabled: false
-Lint/Eval:
-  Enabled: false
 Style/ModuleFunction:
   Enabled: false

app/models/channel.rb

@@ -7,7 +7,7 @@ class Channel < ApplicationModel
     channels = Channel.where( 'active = ? AND area LIKE ?', true, '%::Inbound' )
     channels.each { |channel|
       begin
-        c = eval 'Channel::' + channel[:adapter].upcase + '.new'
+        c = eval 'Channel::' + channel[:adapter].upcase + '.new'  # rubocop:disable Lint/Eval
         c.fetch(channel)
       rescue Exception => e
         logger.error "can't use " + 'Channel::' + channel[:adapter].upcase

app/models/channel/email_send.rb

@@ -6,7 +6,7 @@ module Channel::EmailSend
   def self.send(attr, notification = false)
     channel = Channel.find_by( area: 'Email::Outbound', active: true )
     begin
-      c = eval 'Channel::' + channel[:adapter] + '.new'
+      c = eval 'Channel::' + channel[:adapter] + '.new' # rubocop:disable Lint/Eval
       c.send(attr, channel, notification)
     rescue Exception => e
       Rails.logger.error "can't use " + 'Channel::' + channel[:adapter]

app/models/scheduler.rb

@@ -68,7 +68,7 @@ class Scheduler < ApplicationModel
       job.pid = Thread.current.object_id
       job.save
       logger.info "execute #{job.method} (runner #{runner} of #{runner_count}, try_count #{try_count})..."
-      eval job.method()
+      eval job.method() # rubocop:disable Lint/Eval
     rescue => e
       logger.error "execute #{job.method} (runner #{runner} of #{runner_count}, try_count #{try_count}) exited with error #{ e.inspect }"