How do I fix this error, "Too many positional arguments: 0 expected, but 1 found."?-CodePudding

I have this function with firebase but I keep getting the error message stating "Too many positional arguments: 0 expected, but 1 found." with the items in the quotes in the lines with "snapshot.docs[0].data('Quote') as String?"

How can I fix this, any help is appreciated!

Future getNewsPostDetails(String newsPostId) async {
    QuerySnapshot snapshot = await FirebaseFirestore.instance
        .collection('newsPosts')
        .where('newsPostId', isEqualTo: newsPostId)
        .get();
    newsPostDetails newPostDetails = newsPostDetails(
      newsPostTitle: snapshot.docs[0].data('newsPostTitle') as String?,
      newsPostAuthor: snapshot.docs[0].data('newsPostAuthor') as String?,
      newsPostContent: snapshot.docs[0].data('newsPostContent') as String?,
      date: snapshot.docs[0].data('date') as String?,
    );
    return newPostDetails;
  }

Here is the newsPostDetails.dart

class newsPostDetails {
  final String? newsPostTitle;
  final String? newsPostAuthor;
  final String? newsPostContent;
  final String? date;

  newsPostDetails(
      {this.newsPostTitle,
      this.newsPostAuthor,
      this.newsPostContent,
      this.date});
}

CodePudding user response：

The 'data()' function does not expect any arguments. The 'data()' function returns the map back. You can access the information you want from the map.

Future getNewsPostDetails(String newsPostId) async {
    QuerySnapshot snapshot = await FirebaseFirestore.instance
        .collection('newsPosts')
        .where('newsPostId', isEqualTo: newsPostId)
        .get();
    final newPostData = snapshot.docs[0].data()! as Map<String, dynamic>;
    newsPostDetails newPostDetails = newsPostDetails(
      newsPostTitle: newPostData['newsPostTitle'] as String?,
      newsPostAuthor: newPostData['newsPostAuthor'] as String?,
      newsPostContent: newPostData['newsPostContent'] as String?,
      date: newPostData['date'] as String?,
    );
    return newPostDetails;
  }