Use analyzed snippet for DAOs page

Related to https://github.com/simolus3/drift/pull/3705

docs/content/dart_api/daos.md

@@ -7,28 +7,7 @@ When you have a lot of queries, putting them all into one class might become
 tedious. You can avoid this by extracting some queries into classes that are
 available from your main database class. Consider the following code:
 
-```dart
-part 'todos_dao.g.dart';
+<Snippet href="/lib/src/snippets/setup/todos_dao.dart" name="snippet" />
 
-// the _TodosDaoMixin will be created by drift. It contains all the necessary
-// fields for the tables. The <MyDatabase> type annotation is the database class
-// that should use this dao.
-@DriftAccessor(tables: [Todos])
-class TodosDao extends DatabaseAccessor<MyDatabase> with _$TodosDaoMixin {
-  // this constructor is required so that the main database can create an instance
-  // of this object.
-  TodosDao(super.db);
-
-  Stream<List<TodoEntry>> todosInCategory(Category? category) {
-    if (category == null) {
-      return (select(todos)..where((t) => t.category.isNull())).watch();
-    } else {
-      return (select(todos)..where((t) => t.category.equals(category.id)))
-          .watch();
-    }
-  }
-}
-```
-
-If we now change the annotation on the `MyDatabase` class to `@DriftDatabase(tables: [Todos, Categories], daos: [TodosDao])`
+If we now change the annotation on the `AppDatabase` class to `@DriftDatabase(tables: [TodoItems], daos: [TodosDao])`
 and re-run the code generation, a generated getter `todosDao` can be used to access the instance of that dao.

docs/lib/src/snippets/setup/todos_dao.dart

@@ -0,0 +1,26 @@
+import 'package:drift/drift.dart';
+import 'database.dart';
+
+// #docregion snippet
+part 'todos_dao.g.dart';
+
+// the _TodosDaoMixin will be created by drift. It contains all the necessary
+// fields for the tables. The <MyDatabase> type annotation is the database class
+// that should use this dao.
+@DriftAccessor(tables: [TodoItems])
+class TodosDao extends DatabaseAccessor<AppDatabase> with _$TodosDaoMixin {
+  // this constructor is required so that the main database can create an instance
+  // of this object.
+  TodosDao(super.attachedDatabase);
+
+  Stream<List<TodoItem>> findTodos(String? contentFilter) {
+    final query = select(todoItems);
+    if (contentFilter case final filter?) {
+      query.where((item) => item.content.contains(filter));
+    }
+
+    return query.watch();
+  }
+}
+
+// #enddocregion snippet