Fix Rubocop offenses

app/models/code_ocean/file.rb

@@ -64,7 +64,7 @@ module CodeOcean
     validates_with FileNameValidator, fields: %i[name path file_type_id]
 
     ROLES.each do |role|
-      define_method("#{role}?") { self.role == role }
+      define_method(:"#{role}?") { self.role == role }
     end
 
     def read

app/models/file_type.rb

@@ -29,8 +29,8 @@ class FileType < ApplicationRecord
   validates :file_extension, length: {minimum: 0, allow_nil: false}
 
   %i[audio compressed csv excel image pdf powerpoint video word].each do |type|
-    define_method("#{type}?") do
-      self.class.const_get("#{type.upcase}_FILE_EXTENSIONS").include?(file_extension)
+    define_method(:"#{type}?") do
+      self.class.const_get(:"#{type.upcase}_FILE_EXTENSIONS").include?(file_extension)
     end
   end
 

db/seeds.rb

@@ -17,7 +17,7 @@ end
 module ActiveRecord
   class Base
     %i[build create].each do |strategy|
-      define_singleton_method("#{strategy}_factories") do |attributes = {}|
+      define_singleton_method(:"#{strategy}_factories") do |attributes = {}|
         find_factories_by_class(self).map(&:name).map do |factory_name|
           FactoryBot.send(strategy, factory_name, attributes)
         end