Fix: Ambiguous column error in card search with multiple terms

app/models/filter.rb

@@ -32,14 +32,19 @@ def cards
       result = result.where(cards: { created_at: creation_window }) if creation_window
       result = result.closed_at_window(closure_window) if closure_window
       result = result.closed_by(closers) if closers.present?
-      result = terms.reduce(result) do |result, term|
-        result.mentioning(term, user: creator)
-      end
-
+      result = result.mentioning(combined_fts_query, user: creator) if terms.present?
       result.distinct
     end
   end
 
+  def combined_fts_query
+    terms.map { |term| sanitize_fts_term(term) }.join(' AND ')
+  end
+
+  def sanitize_fts_term(term)
+    term.gsub('"', '""').then { |t| "\"#{t}\"*" }
+  end
+
   def empty?
     self.class.normalize_params(as_params).blank?
   end

test/controllers/cards_controller_test.rb

@@ -10,8 +10,13 @@ class CardsControllerTest < ActionDispatch::IntegrationTest
     assert_response :success
   end
 
-  test "filtered index" do
-    get cards_path(filters(:jz_assignments).as_params.merge(term: "haggis"))
+  test "filtered index with single term" do
+    get cards_path(filters(:jz_assignments).as_params.merge(terms: ["haggis"]))
+    assert_response :success
+  end
+
+  test "filtered index with several terms" do
+    get cards_path(filters(:jz_assignments).as_params.merge(terms: ["haggis", "other"]))
     assert_response :success
   end