diff --git a/README.md b/README.md
index 97d4cf3..b40e1ca 100644
--- a/README.md
+++ b/README.md
@@ -21,24 +21,40 @@ Or install it yourself as:
 Add the following line into your active admin resource:
 
 
-   active_admin_importable
+    active_admin_importable
 
 The Import button should now appear. Click it and upload a CSV file with a header row corresponding to your model attributes. Press submit. Profit.
 
+## Usefull options
+
+
+    active_admin_importable options
+
+
+*  ``:find_by => :id``
+
+  Try find row by ID (or specified field) and update or create it.
+
+*  ``:reset_pk_sequence => true``
+
+  After process primary key sequence will by reset (tested on PostgreSQL).
+
+*  ``:before_save => proc { |row| row[:salary] ||= 0 }``
+
+  Modify field values before write (and before find, if present).
+
 ## Custom Import Behavior
 
 Need to do something special with the import? active_admin_importable accepts an optional block that will be called on each row, replacing the default functionality ( calling create! on the associated model). The associated model and a hash of the current row will get passed into the block. For example:
 
-```
-ActiveAdmin.register Product do
-   active_admin_importable do |model, hash|
-      store = Store.find_by_name(hash[:store_name])
-      hash[:store_id] = store.id
-      hash.delete(:store_name)
-      model.create!(hash)
-   end
-end
-```
+    ActiveAdmin.register Product do
+      active_admin_importable do |model, hash|
+        store = Store.find_by_name(hash[:store_name])
+        hash[:store_id] = store.id
+        hash.delete(:store_name)
+        model.create!(hash)
+      end
+    end
 
 ## Contributing
 
diff --git a/app/models/csv_db.rb b/app/models/csv_db.rb
index f15b4d1..28b6aeb 100644
--- a/app/models/csv_db.rb
+++ b/app/models/csv_db.rb
@@ -1,17 +1,68 @@
 require 'csv'
 class CsvDb
   class << self
-    def convert_save(target_model, csv_data, &block)
-      csv_file = csv_data.read
-      CSV.parse(csv_file, :headers => true, header_converters: :symbol ) do |row|
-        data = row.to_hash
-        if data.present?
-          if (block_given?)
-             block.call(target_model, data)
-           else
-             target_model.create!(data)
-           end
-         end
+    def char_code(c)
+      c.respond_to?(:ord) ? c.ord : c
+    end
+
+    def has_bom(file_data)
+      char_code(file_data[0]) == 0xEF &&
+          char_code(file_data[1]) == 0xBB &&
+          char_code(file_data[2]) == 0xBF
+    end
+
+    # @return [String]
+    def remove_bom(file_data)
+      has_bom(file_data) ? file_data[3..-1] : file_data
+    end
+
+    def convert_save(target_model, csv_data, options, &block)
+      csv_data = remove_bom(csv_data.read)
+      csv_data = csv_data.force_encoding('utf-8') if csv_data.respond_to?(:force_encoding)
+      parser_class = (RUBY_VERSION=='1.8.7') ? FasterCSV : CSV
+      begin
+        target_model.transaction do
+          parser_class.parse(csv_data, :headers => true, :header_converters => :symbol) do |row|
+            append_row(target_model, row, options, &block)
+          end
+        end
+      ensure
+        if options[:reset_pk_sequence]
+          target_model.connection.reset_pk_sequence! target_model.table_name
+        end
+      end
+    end
+
+    def append_row(target_model, row, options, &block)
+      data = row.to_hash
+      if data.present?
+        if (block_given?)
+          block.call(target_model, data)
+        else
+
+          options[:before_save].call(data) if options[:before_save]
+
+          role = options[:role] || :default
+          if key_field = options[:find_by]
+            create_or_update! target_model, data, key_field
+          else
+            if role == :default
+              target_model.create!(data)
+            else
+              target_model.create!(data, :as => role) # Old version ActiveRecord
+            end
+          end
+        end
+      end
+    end
+
+    def create_or_update!(target_model, values, key_field)
+      key_value = values[key_field]
+      scope = target_model.where(key_field => key_value)
+      if obj = scope.first
+        obj.update_attributes!(values)
+      else
+        scope.create!(values)
       end
     end
   end
diff --git a/lib/active_admin_importable/dsl.rb b/lib/active_admin_importable/dsl.rb
index ea79938..ec12c66 100644
--- a/lib/active_admin_importable/dsl.rb
+++ b/lib/active_admin_importable/dsl.rb
@@ -1,7 +1,8 @@
 module ActiveAdminImportable
   module DSL
-    def active_admin_importable(&block)
-      action_item :only => :index do
+    def active_admin_importable(options = {}, &block)
+
+      action_item :edit, :only => :index do
         link_to "Import #{active_admin_config.resource_name.to_s.pluralize}", :action => 'upload_csv'
       end
 
@@ -10,8 +11,10 @@ def active_admin_importable(&block)
       end
 
       collection_action :import_csv, :method => :post do
-        CsvDb.convert_save(active_admin_config.resource_class, params[:dump][:file], &block)
-        redirect_to :action => :index, :notice => "#{active_admin_config.resource_name.to_s} imported successfully!"
+        role = resources_configuration[:self][:role]
+        CsvDb.convert_save(active_admin_config.resource_class, params[:dump][:file], options.merge(:role=>role), &block)
+        flash[:notice] = "#{active_admin_config.resource_name.to_s} imported successfully!"
+        redirect_to :action => :index
       end
     end
   end
diff --git a/lib/active_admin_importable/version.rb b/lib/active_admin_importable/version.rb
index 1b77c53..51445d1 100644
--- a/lib/active_admin_importable/version.rb
+++ b/lib/active_admin_importable/version.rb
@@ -1,3 +1,3 @@
 module ActiveAdminImportable
-  VERSION = "1.1.2"
+  VERSION = "1.1.3"
 end