Fix table_cell_selector generating invalid CSS class for column names with slashes

lib/capybara/active_admin/selectors/table.rb

@@ -32,7 +32,8 @@ def table_header_selector
         def table_cell_selector(column = nil)
           return 'td.col' if column.nil?
 
-          column = column.to_s.gsub(' ', '_').downcase
+          # Downcase, strip non-alphanumeric chars (e.g. '/'), convert spaces to '_', deduplicate '_'
+          column = column.to_s.downcase.gsub(/[^a-z0-9\s]/, '').gsub(/\s+/, '_').squeeze('_')
           "td.col.col-#{column}"
         end
 

spec/lib/selectors/table_spec.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+RSpec.describe Capybara::ActiveAdmin::Selectors::Table do
+  subject(:helper) do
+    Class.new { include Capybara::ActiveAdmin::Selectors::Table }.new
+  end
+
+  describe '#table_cell_selector' do
+    it 'returns generic selector when column is nil' do
+      expect(helper.table_cell_selector).to eq('td.col')
+    end
+
+    it 'converts spaces to underscores' do
+      expect(helper.table_cell_selector('Full Name')).to eq('td.col.col-full_name')
+    end
+
+    it 'downcases the column name' do
+      expect(helper.table_cell_selector('ID')).to eq('td.col.col-id')
+    end
+
+    it 'strips slashes from column name' do
+      expect(helper.table_cell_selector('Country / Region')).to eq('td.col.col-country_region')
+    end
+
+    it 'strips other special characters from column name' do
+      expect(helper.table_cell_selector('Price (USD)')).to eq('td.col.col-price_usd')
+    end
+  end
+end