How to save a single document field in cloud firestore into a local variable in flutter?

Question

I would like to save a single document field into a local variable, but I am not able to do that. Here is my code:

void getPostsData() async{
    List<Widget> listItems = [];
    String _title;
    String _content;
    final QuerySnapshot result = await Firestore.instance.collection('Social_Posts').getDocuments();
    final List<DocumentSnapshot> documents = result.documents;
    documents.forEach((data){
      listItems.add(
          GestureDetector(
            onTap: () async{
              print(data["postTitle"]);
              print(data["postContent"]);
              setState(() {
               data["postTitle"] == _title;
               data["postContent"] == _content;
              });
              print(_title);
            },
       )
    );
      }

Whenever I try to print out "_title" or "_content", I get null. Why is that happening and how do I fix this?

As far as I can tell, your code never assigns a value to either _title or _content. It's unclear what to do to fix this. Please edit your question to describe your intent. What is the goal with this code? — Doug Stevenson
– Doug Stevenson, Commented Jul 11, 2020 at 21:50
I have attempted to save the field value to the 2 variables in the setState function. That is not working. I would like to save the value of data["postTitle"] to _title and data["postContent"] to content. @Doug Stevenson — randomUser786
– randomUser786, Commented Jul 11, 2020 at 21:54

Payam Asefi · Accepted Answer · 2020-07-11 21:57:05Z

1

You should probably change

       data["postTitle"] == _title;
       data["postContent"] == _content;

to:

       _title = data["postTitle"];
      _content= data["postContent"];

answered Jul 11, 2020 at 21:57

Payam Asefi

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2 Comments

randomUser786 Over a year ago

Thank you very much this worked. Just out of curiosity, what is the difference between "data["postTitle"] = _title;" and " _title = data["postTitle"];" Please let me know. Thanks!

Payam Asefi Over a year ago

@AneeshYalgi == is comparison, if you wanna compare x and 2, you do if (x == 2) and the output of this would be a true or false

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