Fixes #3314 - Zendesk import fails if not supported field types are present.

lib/sequencer/sequence/import/zendesk/organization_field.rb

@@ -7,6 +7,7 @@ class Sequencer
           def self.sequence
             [
               'Common::ModelClass::Organization',
+              'Import::Zendesk::ObjectAttribute::SanitizedType',
               'Import::Zendesk::ObjectAttribute::SanitizedName',
               'Import::Zendesk::ObjectAttribute::Add',
             ]

lib/sequencer/sequence/import/zendesk/ticket_field.rb

@@ -8,8 +8,9 @@ class Sequencer
             [
               'Common::ModelClass::Ticket',
               'Import::Zendesk::TicketField::CheckCustom',
+              'Import::Zendesk::ObjectAttribute::SanitizedType',
               'Import::Zendesk::TicketField::SanitizedName',
-              'Import::Zendesk::TicketField::Add',
+              'Import::Zendesk::ObjectAttribute::Add',
             ]
           end
         end

lib/sequencer/sequence/import/zendesk/user_field.rb

@@ -7,6 +7,7 @@ class Sequencer
           def self.sequence
             [
               'Common::ModelClass::User',
+              'Import::Zendesk::ObjectAttribute::SanitizedType',
               'Import::Zendesk::ObjectAttribute::SanitizedName',
               'Import::Zendesk::ObjectAttribute::Add',
             ]

lib/sequencer/unit/import/common/object_attribute/sanitized_name.rb

@@ -4,6 +4,9 @@ class Sequencer
       module Common
         module ObjectAttribute
           class SanitizedName < Sequencer::Unit::Common::Provider::Named
+            prepend ::Sequencer::Unit::Import::Common::Model::Mixin::Skip::Action
+
+            skip_action :skipped, :failed
 
             private
 

lib/sequencer/unit/import/zendesk/object_attribute/add.rb

@@ -4,8 +4,11 @@ class Sequencer
       module Zendesk
         module ObjectAttribute
           class Add < Sequencer::Unit::Base
+            prepend ::Sequencer::Unit::Import::Common::Model::Mixin::Skip::Action
 
-            uses :model_class, :sanitized_name, :resource
+            skip_action :skipped, :failed
+
+            uses :model_class, :sanitized_name, :resource, :backend_class
             provides :instance
 
             def process
@@ -13,10 +16,6 @@ class Sequencer
                 backend_class.new(model_class, sanitized_name, resource)
               end
             end
-
-            def backend_class
-              "Import::Zendesk::ObjectAttribute::#{resource.type.capitalize}".constantize
-            end
           end
         end
       end

lib/sequencer/unit/import/zendesk/object_attribute/sanitized_type.rb

@@ -0,0 +1,31 @@
+class Sequencer
+  class Unit
+    module Import
+      module Zendesk
+        module ObjectAttribute
+          class SanitizedType < Sequencer::Unit::Base
+            include ::Sequencer::Unit::Import::Common::Model::Mixin::HandleFailure
+            prepend ::Sequencer::Unit::Import::Common::Model::Mixin::Skip::Action
+
+            skip_action :skipped, :failed
+
+            uses :resource
+            provides :backend_class
+
+            private
+
+            def process
+              state.provide(:backend_class, backend_class)
+            rescue => e
+              handle_failure(e)
+            end
+
+            def backend_class
+              "Import::Zendesk::ObjectAttribute::#{resource.type.capitalize}".constantize
+            end
+          end
+        end
+      end
+    end
+  end
+end

lib/sequencer/unit/import/zendesk/ticket/custom_fields.rb

@@ -13,7 +13,8 @@ class Sequencer
               custom_fields = resource.custom_fields
               return {} if custom_fields.blank?
 
-              custom_fields.map do |custom_field|
+              custom_fields.select { |custom_field| ticket_field_map[ custom_field['id'] ].present? }
+              .map do |custom_field|
                 [
                   ticket_field_map[ custom_field['id'] ].to_sym, # remote_name
                   custom_field['value']

lib/sequencer/unit/import/zendesk/ticket_field/add.rb

@@ -1,17 +0,0 @@
-class Sequencer
-  class Unit
-    module Import
-      module Zendesk
-        module TicketField
-          class Add < Sequencer::Unit::Import::Zendesk::ObjectAttribute::Add
-            prepend ::Sequencer::Unit::Import::Common::Model::Mixin::Skip::Action
-
-            skip_action :skipped
-
-            uses :action
-          end
-        end
-      end
-    end
-  end
-end

lib/sequencer/unit/import/zendesk/ticket_field/sanitized_name.rb

@@ -4,11 +4,8 @@ class Sequencer
       module Zendesk
         module TicketField
           class SanitizedName < Sequencer::Unit::Import::Common::ObjectAttribute::SanitizedName
-            prepend ::Sequencer::Unit::Import::Common::Model::Mixin::Skip::Action
 
-            skip_action :skipped
+            uses :resource
-
-            uses :resource, :action
 
             private