When using TextFormField, I am not able to add or update data, the data submitted to the db is always null or I get a NoSuchMethodErrorerror
I/flutter ( 6511): Another exception was thrown: NoSuchMethodError: The getter 'value' was called on null
I have build the Bloc as so:
class ProductsBloc {
String id;
// Product _product;
// ignore: close_sinks
// static final _productController = BehaviorSubject<Product>();
// Stream<Product> get productOut => _productController.stream;
// ignore: close_sinks
final _id = BehaviorSubject<int>();
// ignore: close_sinks
final _title = BehaviorSubject<String>();
// ignore: close_sinks
final _message = BehaviorSubject<String>();
// ignore: close_sinks
final _price = BehaviorSubject<String>();
Observable<int> get idOut => _id.stream;
Observable<String> get titleOut => _title.stream.transform(_validateTitle);
Observable<String> get message => _message.stream;
Observable<String> get price => _price.stream;
Function(int) get changeId => _id.sink.add;
Function(String) get changeTitle => _title.sink.add;
Function(String) get changeMessage => _message.sink.add;
Function(String) get changePrice => _price.sink.add;
final _validateTitle = StreamTransformer<String, String>.fromHandlers(handleData: (title, sink){
if(title.isNotEmpty){
sink.add(title);
} else {
sink.addError('Add some text');
}
});
Future<void> createProduct({title}) {
return db.createProduct(DateTime.now().millisecondsSinceEpoch.toString(), title.value, _message.value, _price.value);
}
the ui like so:
class _ProductEditPageState extends State<ProductEditPage> {
final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
final _titleFocusNode = FocusNode();
final _descriptionFocusNode = FocusNode();
final _priceFocusNode = FocusNode();
final id;
final title;
final message;
final price;
_ProductEditPageState(this.id, this.title, this.message, this.price);
final Map<String, dynamic> _formData = {
'title': null,
'message': null,
'price': null,
'image': 'assets/food.jpg'
};
Widget _buildTitleTextField(ProductsBloc productBloc) {
return StreamBuilder(
stream: productBloc.titleOut,
builder: (context, snapshot) {
return TextFormField(
focusNode: _titleFocusNode,
onSaved: (String value){ _formData['title'] = value;},
initialValue: title,
decoration: InputDecoration(labelText: 'Title', errorText: snapshot.error),
);
},
);
}
and the submit like this. the submitted data as this catches the error NoSuchMethodFound if I change the submit to no argument or the argument it fills the db with null.
child: Form(
key: _formKey,
child: ListView(
padding: EdgeInsets.symmetric(horizontal: targetPadding / 2),
children: <Widget>[
_buildTitleTextField(productBloc, ),
_buildDescriptionTextField(productBloc),
_buildPriceTextField(productBloc),
SizedBox(
height: 10.0,
),
RaisedButton(
child: Text('Save'),
textColor: Colors.white,
onPressed: () {
if(id != null) {
productBloc.updateData(id);
}
else{
productBloc.createProduct(
title: _formData['title'],
);
}
Navigator.of(context).pop();
},
here is also my model
class Product {
final db = Firestore.instance.collection('products');
Future<void> createProduct(String docId, String title, String message, String price) async {
await db.document(docId).setData({'id': docId, 'title': title, 'message': message, 'price': price});
}
void readData(String docId){
db.document(docId).get();
}
Future<void> deleteData(String docId) async {
await db.document(docId).delete();
}
Future<void> updateData(String docId, String title, String message, String price) async {
await db.document(docId).updateData({'title': title, 'message': message, 'price': price});
}
}
Product db = Product();
I'm also using the provider package from flutter so I think the provider is right:
return MultiProvider(
providers: [
Provider<ThemeBloc>(
value: ThemeBloc(),
),
Provider<UserBloc>(
value: UserBloc(),
),
Provider<ProductsBloc>(
value: ProductsBloc(),
),
],
child: StreamBuilder<ThemeData>(
using textFields is working fine but I need to see the form filled with some initial data before editing, so obviously I need to have TextFormFields.
Your code is pretty confusing, but as far as I can see you write to _formData['title']
in onSaved
, yet you never call FormState.save()
.
Have you tried calling _formKey.currentState.save()
in the onPressed
of the save button?
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