FEATURE: Category/topic importer skips objects that it has already imported.

lib/import_export/category_importer.rb

@@ -39,25 +39,33 @@ module ImportExport
 
     def import_categories
       id = @export_data[:category].delete(:id)
-      permissions = @export_data[:category].delete(:permissions_params)
 
-      parent = Category.new(@export_data[:category])
-      parent.user_id = @topic_importer.new_user_id(@export_data[:category][:user_id]) # imported user's new id
-      parent.custom_fields["import_id"] = id
-      parent.permissions = permissions if permissions
-      parent.save!
-      set_category_description(parent, @export_data[:category][:description])
+      parent = CategoryCustomField.where(name: 'import_id', value: id.to_s).first.try(:category)
+
+      unless parent
+        permissions = @export_data[:category].delete(:permissions_params)
+        parent = Category.new(@export_data[:category])
+        parent.user_id = @topic_importer.new_user_id(@export_data[:category][:user_id]) # imported user's new id
+        parent.custom_fields["import_id"] = id
+        parent.permissions = permissions if permissions
+        parent.save!
+        set_category_description(parent, @export_data[:category][:description])
+      end
 
       @export_data[:subcategories].each do |cat_attrs|
         id = cat_attrs.delete(:id)
-        permissions = cat_attrs.delete(:permissions_params)
-        subcategory = Category.new(cat_attrs)
-        subcategory.parent_category_id = parent.id
-        subcategory.user_id = @topic_importer.new_user_id(cat_attrs[:user_id])
-        subcategory.custom_fields["import_id"] = id
-        subcategory.permissions = permissions if permissions
-        subcategory.save!
-        set_category_description(subcategory, cat_attrs[:description])
+        existing = CategoryCustomField.where(name: 'import_id', value: id.to_s).first.try(:category)
+
+        unless existing
+          permissions = cat_attrs.delete(:permissions_params)
+          subcategory = Category.new(cat_attrs)
+          subcategory.parent_category_id = parent.id
+          subcategory.user_id = @topic_importer.new_user_id(cat_attrs[:user_id])
+          subcategory.custom_fields["import_id"] = id
+          subcategory.permissions = permissions if permissions
+          subcategory.save!
+          set_category_description(subcategory, cat_attrs[:description])
+        end
       end
     end
 

lib/import_export/topic_importer.rb

@@ -19,9 +19,11 @@ module ImportExport
     def import_users
       @export_data[:users].each do |u|
         existing = User.where(email: u[:email]).first
-        if existing && existing.custom_fields["import_id"] != u[:id]
-          existing.custom_fields["import_id"] = u[:id]
-          existing.save!
+        if existing
+          if existing.custom_fields["import_id"] != u[:id]
+            existing.custom_fields["import_id"] = u[:id]
+            existing.save!
+          end
         else
           u = create_user(u, u[:id]) # see ImportScripts::Base
         end
@@ -38,15 +40,24 @@ module ImportExport
         first_post_attrs[:user_id] = new_user_id(first_post_attrs[:user_id])
         first_post_attrs[:category] = new_category_id(t[:category_id])
 
-        first_post = create_post( first_post_attrs, first_post_attrs[:id] )
+        first_post = PostCustomField.where(name: "import_id", value: first_post_attrs[:id]).first.try(:post)
+
+        unless first_post
+          first_post = create_post( first_post_attrs, first_post_attrs[:id] )
+        end
+
         topic_id = first_post.topic_id
+
         t[:posts].each_with_index do |post_data, i|
           next if i == 0
           print "."
-          create_post(post_data.merge({
-            topic_id: topic_id,
-            user_id: new_user_id(post_data[:user_id])
-          }), post_data[:id]) # see ImportScripts::Base
+          existing = PostCustomField.where(name: "import_id", value: post_data[:id]).first.try(:post)
+          unless existing
+            create_post(post_data.merge({
+              topic_id: topic_id,
+              user_id: new_user_id(post_data[:user_id])
+            }), post_data[:id]) # see ImportScripts::Base
+          end
         end
       end