support for tsv files added

lib/active_admin_import/dsl.rb

@@ -94,6 +94,7 @@ def active_admin_import(options = {}, &block)
           end
         rescue ActiveRecord::Import::MissingColumnError, NoMethodError, ActiveRecord::StatementInvalid, CSV::MalformedCSVError => e
           Rails.logger.error(I18n.t('active_admin_import.file_error', message: e.message))
+          Rails.logger.error(e.backtrace.join("\n"))
           flash[:error] = I18n.t('active_admin_import.file_error', message: e.message[0..200])
         end
         redirect_to options[:back]

lib/active_admin_import/importer.rb

@@ -119,7 +119,7 @@ def detect_csv_options
                        model.csv_options
                      else
                        options[:csv_options] || {}
-                     end.reject { |_, value| value.blank? }
+                     end.reject { |_, value| value.nil? || value == "" }
     end
   end
 end

lib/active_admin_import/model.rb

@@ -21,6 +21,10 @@ module CONST
         application/csv
         application/vnd.ms-excel
         application/vnd.msexcel
+        text/tsv
+        text/x-tsv
+        text/tab-separated-values
+        text/x-tab-separated-values
       ).freeze
     end
 

spec/fixtures/files/authors_with_tabs.tsv

@@ -0,0 +1,3 @@
+Name	Last name	Birthday
+John	Doe	1986-05-01
+Jane	Roe	1988-11-16

spec/import_spec.rb

@@ -397,6 +397,19 @@ def upload_file!(name, ext = 'csv')
           expect(Author.count).to eq(2)
         end
       end
+
+      context 'with tab separator' do
+        let(:options) do
+          attributes = { csv_options: { col_sep: "\t" } }
+          { template_object: ActiveAdminImport::Model.new(attributes) }
+        end
+
+        it 'should import file' do
+          upload_file!(:authors_with_tabs, 'tsv')
+          expect(page).to have_content 'Successfully imported 2 authors'
+          expect(Author.count).to eq(2)
+        end
+      end
     end
 
     context 'with callback procs options' do