Fix parsing datetime input values

lib/active_admin_datetimepicker/base.rb

@@ -26,13 +26,13 @@ def input_html_options(input_name = nil, placeholder = nil)
 
     def input_value(input_name = nil)
       val = object.public_send(input_name || method)
-      if val.nil?
-        val
-      elsif column.type == :date
-        val
-      else
-        DateTime.new(val.year, val.month, val.day, val.hour, val.min, val.sec).strftime(format)
-      end
+      val.is_a?(Date) ? val : parse_datetime(val)
+    end
+
+    def parse_datetime(val)
+      DateTime.parse(val.to_s).strftime(format)
+    rescue ArgumentError
+      nil
     end
 
     def datetime_picker_options

spec/filter_form_spec.rb

@@ -92,5 +92,45 @@
         expect(page).to have_css('#q_created_at_lteq_datetime_picker[placeholder=To]')
       end
     end
+
+    context 'filter by virtual attribute last_seen_at - without column&type properties (search by updated_at)' do
+      let!(:first_author) { Author.create!(name: 'Ren', last_name: 'current', updated_at: Time.now.to_s(:db)) }
+      let!(:second_author) { Author.create!(name: 'Rey', last_name: 'future', updated_at: 21.days.from_now.to_s(:db)) }
+
+      before do
+        # chose 01 and 20 day of the current month
+        page.find('input#q_last_seen_at_gteq_datetime_picker').click
+        page.find('.xdsoft_datetimepicker', visible: true)
+            .find('.xdsoft_calendar td.xdsoft_date[data-date="1"]').click
+        page.find('.xdsoft_datetimepicker', visible: true)
+            .find('.xdsoft_timepicker.active .xdsoft_time.xdsoft_current').click
+
+        page.find('input#q_last_seen_at_lteq_datetime_picker').click
+        page.find('.xdsoft_datetimepicker', visible: true)
+            .find('.xdsoft_calendar td.xdsoft_date[data-date="20"]').click
+        page.find('.xdsoft_datetimepicker', visible: true)
+            .find('.xdsoft_timepicker.active .xdsoft_time.xdsoft_current').click
+
+        @value_from = page.find('#q_last_seen_at_gteq_datetime_picker').value
+        @value_to = page.find('#q_last_seen_at_lteq_datetime_picker').value
+
+        page.find('#sidebar input[type=submit]').click
+        page.has_css?('h4', text: 'Current filters:')
+      end
+
+      it 'should filter records properly' do
+        expect(page).to have_text(first_author.name)
+        expect(page).not_to have_text(second_author.name)
+      end
+
+      it 'input#value and placeholder is the same as before form submit' do
+        # last_seen_at (without typecasting just a string) should contain Hours:Minutes, as selected before submit
+        expect(page.find('#q_last_seen_at_gteq_datetime_picker').value).to match(@value_from)
+        expect(page.find('#q_last_seen_at_lteq_datetime_picker').value).to match(@value_to)
+
+        expect(page).to have_css('#q_last_seen_at_gteq_datetime_picker[placeholder=From]')
+        expect(page).to have_css('#q_last_seen_at_lteq_datetime_picker[placeholder=To]')
+      end
+    end
   end
 end

spec/support/admin.rb

@@ -5,6 +5,7 @@ def add_author_resource(options = {}, &block)
 
     filter :birthday, as: :date_time_range
     filter :created_at, as: :date_time_range
+    filter :last_seen_at, as: :date_time_range
 
     form do |f|
       f.semantic_errors *f.object.errors.keys

spec/support/rails_template.rb

@@ -4,7 +4,7 @@
 generate :model, 'post title:string:uniq body:text author:references'
 
 #Add validation
-inject_into_file "app/models/author.rb", "  validates_presence_of :name\n  validates_uniqueness_of :last_name\n", after: "Base\n"
+inject_into_file "app/models/author.rb", "  validates_presence_of :name\n  validates_uniqueness_of :last_name\n\n  attr_accessor :last_seen_at\n  ransacker :last_seen_at do\n    Arel.sql('updated_at')\n  end\n", after: "ApplicationRecord\n"
 inject_into_file "app/models/post.rb", "   validates_presence_of :author\n", after: ":author\n"
 
 # Configure default_url_options in test environment