getIntroductionPages method

Implementation

Future<List<IntroductionPageData>> getIntroductionPages() async {
  if (_pages.isNotEmpty) return _pages;
  var pagesDocuments =
      await _documentRef.collection('pages').orderBy('order').get();
  return _pages = pagesDocuments.docs.map((document) {
    var data = document.data();
    // convert Map<String, dynamic> to Map<String, String>
    var title = data['title'] != null
        ? (data['title'] as Map<String, dynamic>).cast<String, String>()
        : <String, String>{};
    var content = data['content'] != null
        ? (data['content'] as Map<String, dynamic>).cast<String, String>()
        : <String, String>{};
    return IntroductionPageData(
      title: title,
      content: content,
      contentImage: data['image'] as String?,
      backgroundImage: data['background_image'] as String?,
      // the color is stored as a hex string
      backgroundColor: data['background_color'] != null
          ? Color(int.parse(data['background_color'] as String, radix: 16))
          : null,
    );
  }).toList();
}