Oct 13, 2025 · Oct 13, 2025 · Oct 13, 2025 · Oct 13, 2025 · Oct 13, 2025
diff --git a/lib/src/database/migrations/20251013000057_add_saved_filters_to_remote_config.dart b/lib/src/database/migrations/20251013000057_add_saved_filters_to_remote_config.dart
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	import 'package:flutter_news_app_api_server_full_source_code/src/database/migration.dart';
	import 'package:logging/logging.dart';
	import 'package:mongo_dart/mongo_dart.dart';

	/// Migration to add the `savedFiltersLimit` fields to existing
	/// `remote_configs` documents within the `userPreferenceConfig` sub-document.
	class AddSavedFiltersToRemoteConfig extends Migration {
	/// {@macro add_saved_filters_to_remote_config}
	AddSavedFiltersToRemoteConfig()
	: super(
	prDate: '20251013000057',
	prId: '57',
	prSummary:
	'This pull request introduces the ability for users to save and manage custom filter combinations for news headlines. It achieves this by adding a new SavedFilter data model, integrating it into the existing user content preferences, and implementing configurable limits for these saved filters based on user tiers',
	);

	@override
	Future<void> up(Db db, Logger log) async {
	final collection = db.collection('remote_configs');
	final result = await collection.updateMany(
	// Filter for documents where 'userPreferenceConfig.guestSavedFiltersLimit' does not exist.
	// This assumes if one is missing, all are likely missing.
	where.notExists('userPreferenceConfig.guestSavedFiltersLimit'),
	// Set 'guestSavedFiltersLimit', 'authenticatedSavedFiltersLimit',
	// and 'premiumSavedFiltersLimit' to a default value.
	modify
	.set('userPreferenceConfig.guestSavedFiltersLimit', 3)
	.set('userPreferenceConfig.authenticatedSavedFiltersLimit', 10)
	.set('userPreferenceConfig.premiumSavedFiltersLimit', 25),
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	);
	log.info(
	'Updated ${result.nModified} documents in remote_configs '
	'to include savedFiltersLimit fields.',
	);
	}

	@override
	Future<void> down(Db db, Logger log) async {
	final collection = db.collection('remote_configs');
	await collection.updateMany(
	where.exists('userPreferenceConfig.guestSavedFiltersLimit'),
	modify
	.unset('userPreferenceConfig.guestSavedFiltersLimit')
	.unset('userPreferenceConfig.authenticatedSavedFiltersLimit')
	.unset('userPreferenceConfig.premiumSavedFiltersLimit'),
	);
	log.info(
	'Removed "savedFiltersLimit" fields from remote_configs '
	'userPreferenceConfig sub-document.',
	);
	}
	}