diff --git a/app/controllers/filters_controller.rb b/app/controllers/filters_controller.rb
index d1ea33a88bb..44040ca86a6 100644
--- a/app/controllers/filters_controller.rb
+++ b/app/controllers/filters_controller.rb
@@ -67,12 +67,13 @@ def setup_search_options
     @original_search_parameter = params[:search]
     params[:search] ||= ""
     params.each do |param, value|
-      if param =~ /role_id$/
+      case param
+      when /role_id$/
         if (role = Role.find_by_id(value)).present?
           query = "role_id = #{role.id}"
           params[:search] += query unless params[:search].include? query
         end
-      elsif param =~ /(\w+)_id$/
+      when /(\w+)_id$/
         if value.present?
           query = "#{Regexp.last_match(1)} = #{value}"
           params[:search] += query unless params[:search].include? query
diff --git a/app/helpers/audits_helper.rb b/app/helpers/audits_helper.rb
index 686b64d535e..acc34adefea 100644
--- a/app/helpers/audits_helper.rb
+++ b/app/helpers/audits_helper.rb
@@ -65,13 +65,14 @@ def details(audit, path = audits_path(:search => "id=#{audit.id}"))
       return [] unless audit.audited_changes.present?
       audit.audited_changes.map do |name, change|
         next if change.nil? || change.to_s.empty?
-        if name == 'template'
+        case name
+        when 'template'
           (_("Template content changed %s") % (link_to 'view diff', path)).html_safe if audit_template? audit
-        elsif name == "password_changed"
+        when "password_changed"
           _("Password has been changed")
-        elsif name == "owner_id" || name == "owner_type"
+        when "owner_id", "owner_type"
           _("Owner changed to %s") % (audit.revision.owner rescue _('N/A'))
-        elsif name == 'global_status'
+        when 'global_status'
           base = audit.audited_changes.values[0]
           from = HostStatus::Global.new(base[0]).to_label
           to = HostStatus::Global.new(base[1]).to_label
@@ -285,9 +286,10 @@ def find_associated_records_using_key(key, change, audit)
                         end
 
     if association_class
-      if key =~ /_ids$/
+      case key
+      when /_ids$/
         association_class&.where(id: change)&.index_by(&:id)
-      elsif key =~ /_id$/
+      when /_id$/
         association_class&.find(change)
       end
     elsif auditable_class.respond_to?('audit_hook_to_find_records')
diff --git a/app/helpers/compute_resources_vms_helper.rb b/app/helpers/compute_resources_vms_helper.rb
index c1abf3b7d53..502e19948aa 100644
--- a/app/helpers/compute_resources_vms_helper.rb
+++ b/app/helpers/compute_resources_vms_helper.rb
@@ -96,10 +96,11 @@ def common_available_actions(vm, authorizer = nil)
 
   def openstack_available_actions(vm, authorizer = nil)
     actions = []
-    if vm.state == 'ACTIVE'
+    case vm.state
+    when 'ACTIVE'
       actions << vm_power_action(vm, authorizer)
       actions << vm_pause_action(vm, authorizer)
-    elsif vm.state == 'PAUSED'
+    when 'PAUSED'
       actions << vm_pause_action(vm, authorizer)
     else
       actions << vm_power_action(vm, authorizer)
diff --git a/app/helpers/hosts_helper.rb b/app/helpers/hosts_helper.rb
index 0465c9f2b7a..65b3052c657 100644
--- a/app/helpers/hosts_helper.rb
+++ b/app/helpers/hosts_helper.rb
@@ -86,9 +86,10 @@ def last_report_tooltip(record)
   end
 
   def host_owner_column(host)
-    if host.owner_type == 'User'
+    case host.owner_type
+    when 'User'
       icon_text('user', host.owner, :kind => 'fa')
-    elsif host.owner_type == 'Usergroup'
+    when 'Usergroup'
       icon_text('users', host.owner, :kind => 'fa')
     end
   end
diff --git a/app/helpers/layout_helper.rb b/app/helpers/layout_helper.rb
index 77848fed8f0..90f762d51c8 100644
--- a/app/helpers/layout_helper.rb
+++ b/app/helpers/layout_helper.rb
@@ -115,13 +115,14 @@ def javascript_include_tag(*params, **kwargs)
 
   # @deprecated Previously provided by webpack-rails
   def webpack_asset_paths(plugin_name, extension: 'js')
-    if extension == 'js'
+    case extension
+    when 'js'
       Foreman::Deprecation.deprecation_warning('3.12', '`webpack_asset_paths` is deprecated, use `content_for(:javascripts) { webpacked_plugins_js_for(plugin_name) }` instead.')
       [{
         source: 'webpack_asset_paths',
         webpacked: webpacked_plugins_js_for(plugin_name.to_sym),
       }]
-    elsif extension == 'css'
+    when 'css'
       Foreman::Deprecation.deprecation_warning('3.12', '`webpack_asset_paths` is deprecated and not needed for css assets.')
       nil
     end
diff --git a/app/helpers/templates_helper.rb b/app/helpers/templates_helper.rb
index e8ae7b1af18..011a7d06e74 100644
--- a/app/helpers/templates_helper.rb
+++ b/app/helpers/templates_helper.rb
@@ -75,10 +75,11 @@ def template_input_f(f, options = {})
       textarea_f(f, :value, options.merge(rows: 2, class: input.hidden_value? ? 'masked-input' : ''))
     else
       input_type = input.value_type
-      if input_type == 'date'
+      case input_type
+      when 'date'
         input_type = 'dateTime'
         options[:label_help] ||= 'Format is yyyy-MM-dd HH-mm-ss'
-      elsif input_type == 'search'
+      when 'search'
         input_type = 'autocomplete'
         resource_type = input.resource_type&.tableize
         options[:data] = {
diff --git a/app/models/compute_resources/foreman/model/vmware.rb b/app/models/compute_resources/foreman/model/vmware.rb
index 02be3f1160c..bea826c8aa6 100644
--- a/app/models/compute_resources/foreman/model/vmware.rb
+++ b/app/models/compute_resources/foreman/model/vmware.rb
@@ -794,10 +794,11 @@ def client
         :vsphere_expected_pubkey_hash => pubkey_hash
       )
     rescue => e
-      if e.message =~ /The remote system presented a public key with hash (\w+) but we're expecting a hash of/
+      case e.message
+      when /The remote system presented a public key with hash (\w+) but we're expecting a hash of/
         raise Foreman::FingerprintException.new(
           N_("The remote system presented a public key with hash %s but we're expecting a different hash. If you are sure the remote system is authentic, go to the compute resource edit page, press the 'Test Connection' or 'Load Datacenters' button and submit"), Regexp.last_match(1))
-      elsif e.message =~ /Cannot complete login due to an incorrect user name or password./
+      when /Cannot complete login due to an incorrect user name or password./
         raise Foreman::UsernameOrPasswordException.new(
           N_("Can not load datacenters due to an incorrect user name or password."))
       else
diff --git a/app/models/operatingsystems/windows.rb b/app/models/operatingsystems/windows.rb
index 337dada8890..eca850063bf 100644
--- a/app/models/operatingsystems/windows.rb
+++ b/app/models/operatingsystems/windows.rb
@@ -25,9 +25,10 @@ def boot_files_uri(medium_provider)
     pxe_dir = ""
 
     PXEFILES.values.collect do |img|
-      if img =~ /boot.sdi/i || img =~ /bcd/i
+      case img
+      when /boot.sdi/i, /bcd/i
         pxe_dir = "boot"
-      elsif img =~ /boot.wim/i
+      when /boot.wim/i
         pxe_dir = "sources"
       else
         pxe_dir = ""
diff --git a/app/models/taxonomy.rb b/app/models/taxonomy.rb
index c95da775c99..3cf4ffadbd3 100644
--- a/app/models/taxonomy.rb
+++ b/app/models/taxonomy.rb
@@ -61,9 +61,10 @@ def self.inherited(child)
   default_scope -> { order(:title) }
 
   scope :completer_scope, lambda { |opts|
-    if opts[:controller] == 'organizations'
+    case opts[:controller]
+    when 'organizations'
       Organization.completer_scope opts
-    elsif opts[:controller] == 'locations'
+    when 'locations'
       Location.completer_scope opts
     end
   }
diff --git a/app/models/usergroup_member.rb b/app/models/usergroup_member.rb
index c5e606cd0cb..860f321e0d8 100644
--- a/app/models/usergroup_member.rb
+++ b/app/models/usergroup_member.rb
@@ -113,9 +113,10 @@ def find_all_affected_users
   end
 
   def find_all_affected_users_for(member)
-    if member.is_a?(User)
+    case member
+    when User
       [member]
-    elsif member.is_a?(Usergroup)
+    when Usergroup
       [member.users + member.usergroups.map { |g| find_all_affected_users_for(g) }]
     else
       raise ArgumentError, "Unknown member type #{member}"
@@ -130,9 +131,10 @@ def find_all_affected_memberships
   end
 
   def find_all_affected_memberships_for(member, direction = :usergroups)
-    if member.is_a?(User)
+    case member
+    when User
       [member.usergroup_member]
-    elsif member.is_a?(Usergroup)
+    when Usergroup
       [member.usergroup_members.user_memberships +
            member.send(direction).map { |g| find_all_affected_memberships_for(g, direction) }]
     else
diff --git a/app/presenters/setting_presenter.rb b/app/presenters/setting_presenter.rb
index d3e49d2eca1..508b3c725ca 100644
--- a/app/presenters/setting_presenter.rb
+++ b/app/presenters/setting_presenter.rb
@@ -85,12 +85,13 @@ def matches_search_query?(query)
       raise ::Foreman::Exception.new N_('Unsupported search operators :and / :or')
     end
 
-    if query =~ /name\s*=\s*(\S+)/
+    case query
+    when /name\s*=\s*(\S+)/
       name == tokenized.last || full_name == tokenized.last
-    elsif query =~ /name\s*~\s*(\S+)/
+    when /name\s*~\s*(\S+)/
       search_value = tokenized.last
       name.include?(search_value) || full_name&.include?(search_value)
-    elsif query =~ /description\s*~\s*(\S+)/
+    when /description\s*~\s*(\S+)/
       search_value = tokenized.last
       description.include? search_value
     else
diff --git a/app/registries/foreman/setting_manager.rb b/app/registries/foreman/setting_manager.rb
index 7262d7bde91..e262ec80d55 100644
--- a/app/registries/foreman/setting_manager.rb
+++ b/app/registries/foreman/setting_manager.rb
@@ -139,9 +139,10 @@ def setting(name, default:, description:, type:, full_name: nil, collection: nil
       end
 
       def _inline_validates(name, validations)
-        if validations.is_a?(Regexp)
+        case validations
+        when Regexp
           validations = { format: { with: validations } }
-        elsif validations.is_a?(Symbol)
+        when Symbol
           validations = { validations => true }
         end
         validates(name, validations)
diff --git a/app/services/foreman/parameter_filter.rb b/app/services/foreman/parameter_filter.rb
index 46d0b570bde..5f7c7ec6c1c 100644
--- a/app/services/foreman/parameter_filter.rb
+++ b/app/services/foreman/parameter_filter.rb
@@ -82,11 +82,12 @@ def accessible_attributes(context)
     private
 
     def expand_nested(filter, context)
-      if filter.is_a?(ParameterFilter)
+      case filter
+      when ParameterFilter
         filter.filter(Context.new(:nested, context.controller_name, context.action))
-      elsif filter.is_a?(Hash)
+      when Hash
         filter.transform_values { |v| expand_nested(v, context) }
-      elsif filter.is_a?(Array)
+      when Array
         filter.map { |v| expand_nested(v, context) }
       else
         filter
diff --git a/app/services/foreman/parameters/caster.rb b/app/services/foreman/parameters/caster.rb
index 0c9cf8df1a4..492fda5cc81 100644
--- a/app/services/foreman/parameters/caster.rb
+++ b/app/services/foreman/parameters/caster.rb
@@ -64,11 +64,12 @@ def cast_integer
         return value.to_i if value.is_a?(Numeric)
 
         if value.is_a?(String)
-          if value =~ /^0x[0-9a-f]+$/i
+          case value
+          when /^0x[0-9a-f]+$/i
             value.to_i(16)
-          elsif value =~ /^0[0-7]+$/
+          when /^0[0-7]+$/
             value.to_i(8)
-          elsif value =~ /^-?\d+$/
+          when /^-?\d+$/
             value.to_i
           else
             raise TypeError
diff --git a/app/services/name_synchronizer.rb b/app/services/name_synchronizer.rb
index 91715c41c8b..d63511ade6d 100644
--- a/app/services/name_synchronizer.rb
+++ b/app/services/name_synchronizer.rb
@@ -1,9 +1,10 @@
 class NameSynchronizer
   def initialize(object)
-    if object.is_a?(Host::Base)
+    case object
+    when Host::Base
       @host = object
       @interface = @host.primary_interface
-    elsif object.is_a?(Nic::Base)
+    when Nic::Base
       @interface = object
       @host = @interface.host
     else
diff --git a/app/services/setting_registry.rb b/app/services/setting_registry.rb
index 00c81b7a081..6bb201dbc9e 100644
--- a/app/services/setting_registry.rb
+++ b/app/services/setting_registry.rb
@@ -34,10 +34,11 @@ def complete_value
 
     def complete_value_from_db(field, val)
       count = 20
-      if field.field == :name
+      case field.field
+      when :name
         results = @registry.filter_map { |set| ((set.full_name =~ /\s/) ? "\"#{set.full_name.gsub('"', '\"')}\"" : set.full_name) if set.name.include?(val) || set.full_name&.include?(val) }
         results.first(count)
-      elsif field.field == :description
+      when :description
         []
       else
         raise ScopedSearch::QueryNotSupported, "Value '#{val}' is not valid for field '#{field.field}'"
diff --git a/config/initializers/active_support_extensions.rb b/config/initializers/active_support_extensions.rb
index c5614bc8a7e..e25d983d938 100644
--- a/config/initializers/active_support_extensions.rb
+++ b/config/initializers/active_support_extensions.rb
@@ -11,13 +11,14 @@ def deep_to_hash
     end
 
     def deep_convert_value(value, options = {})
-      if value.is_a? HashWithIndifferentAccess
+      case value
+      when HashWithIndifferentAccess
         if options[:for] == :to_hash
           value.deep_to_hash
         else
           value.nested_under_indifferent_access
         end
-      elsif value.is_a?(Array)
+      when Array
         value = value.dup unless options[:for] == :assignment
         value.map! { |e| deep_convert_value(e, options) }
       else
diff --git a/lib/fog_extensions/openstack/server.rb b/lib/fog_extensions/openstack/server.rb
index 31d8d51fe14..a0aa2695659 100644
--- a/lib/fog_extensions/openstack/server.rb
+++ b/lib/fog_extensions/openstack/server.rb
@@ -10,9 +10,10 @@ def to_s
       end
 
       def start
-        if state.downcase == 'paused'
+        case state.downcase
+        when 'paused'
           service.unpause_server(id)
-        elsif state.downcase == 'suspended'
+        when 'suspended'
           service.resume_server(id)
         else
           service.start_server(id)
diff --git a/test/unit/tasks/seeds_test.rb b/test/unit/tasks/seeds_test.rb
index da4e6ccbd17..071b7685427 100644
--- a/test/unit/tasks/seeds_test.rb
+++ b/test/unit/tasks/seeds_test.rb
@@ -64,9 +64,10 @@ def seed(*seed_files)
       requirements = Template.parse_metadata(template)['require'] || []
       # skip templates that require plugins that aren't available
       next unless SeedHelper.send(:test_template_requirements, tmpl, requirements)
-      if tmpl =~ /partition_tables_templates/
+      case tmpl
+      when /partition_tables_templates/
         assert Ptable.unscoped.where(:template => template).any?, "No partition table containing #{tmpl}"
-      elsif tmpl =~ /report_templates/
+      when /report_templates/
         assert ReportTemplate.unscoped.where(:template => template).any?, "No report template containing #{tmpl}"
       else
         assert ProvisioningTemplate.unscoped.where(:template => template).any?, "No template containing #{tmpl}"