Merge pull request #62 from dmitrypol/master

Restricting the list of possible mapping_key values for a model

.gitignore

@@ -5,3 +5,4 @@ log/*.log
 pkg/
 spec/dummy_app/log
 .idea/
+*.gem

app/views/rails_admin/main/import.html.haml

@@ -52,7 +52,7 @@
             = t("admin.import.mapping")
           .col-sm-10.controls
             = select_tag "associations[#{field.name}]",
-              options_for_select(@import_model.associated_model_fields(field).map(&:name),
+              options_for_select(@import_model.associated_model_fields(field),
               @import_model.associated_config(field).mapping_key.to_s), data: { enumeration: true }
 
   %br

lib/rails_admin_import/config/sections/import.rb

@@ -9,8 +9,12 @@ class Import < RailsAdmin::Config::Sections::Base
           :name
         end
 
+        register_instance_option(:mapping_key_list) do
+          []
+        end
+
         register_instance_option(:default_excluded_fields) do
-          [:id, :_id, :created_at, :updated_at]
+          [:id, :_id, :created_at, :updated_at, :c_at, :u_at]
         end
       end
     end

lib/rails_admin_import/import_model.rb

@@ -63,7 +63,11 @@ def many_association_fields
     end
 
     def update_lookup_field_names
-      @update_lookup_field_names ||= model_fields.map(&:name) + belongs_to_fields.map(&:foreign_key)
+      if @config.mapping_key_list.present?
+        @update_lookup_field_names = @config.mapping_key_list
+      else
+        @update_lookup_field_names ||= model_fields.map(&:name) + belongs_to_fields.map(&:foreign_key)
+      end
     end
 
     def associated_object(field, mapping_field, value)
@@ -82,9 +86,13 @@ def associated_config(field)
 
     def associated_model_fields(field)
       @associated_fields ||= {}
-      @associated_fields[field] ||= associated_config(field).visible_fields.select { |f|
-        !f.association?
-      }
+      if associated_config(field).mapping_key_list.present?
+        @associated_fields[field] ||= associated_config(field).mapping_key_list
+      else
+        @associated_fields[field] ||= associated_config(field).visible_fields.select { |f|
+          !f.association?
+        }.map(&:name)
+      end
     end
 
     def has_multiple_values?(field_name)