How to map array of objects in flutter?

Question

Hello I'm trying to map array of objects and return widget with some value of given objects... Like this

 _metapodaci?.map<Widget>((e) => Text("Naziv dokumenta je ${e.label}")),

I get an error saying "The element type 'Iterable' can't be assigned to the list type 'Widget" but when I map inside text widget like this:

 Text("Meta podaci: ${_metapodaci.map((e) => e.label)}"),

then _metapodaci are mapped good. Here is Whole widget where I'm trying to map if needed:

 Padding(
           padding: const EdgeInsets.all(8.0),
            
            child:   Expanded(
              child: _metapodaci.isEmpty ? 
              Text("Odaberite vrstu dokumenta") :
              Column(
                children: [
                  Text("Meta podaci: ${_metapodaci.map((e) => e.label)}"),
                  //_metapodaci.map<Widget>((e) => Text("Naziv dokumenta je ${e.label}")),
                ],
              ),
            ),
          ),

Appreciate if someone can advise. Thank you in advance!

eamirho3ein · Accepted Answer · 2022-09-21 07:19:53Z

1

You need to convert your array to list of widget and also for null safety issue you need check for null before too , try this:

Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Expanded(
                    child: _metapodaci == null || _metapodaci!.isEmpty
                        ? Text("Odaberite vrstu dokumenta")
                        : Column(
                            children: _metapodaci!
                                .map<Widget>((e) =>
                                    Text("Naziv dokumenta je ${e.label}"))
                                .toList(),
                          ),
                  ),
                ),

edited Sep 21, 2022 at 7:19

answered Sep 21, 2022 at 7:12

eamirho3ein

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Comments

Sugan Pandurengan · Accepted Answer · 2022-09-21 07:12:09Z

1

Use toList() method

 _metapodaci?.map<Widget>((e) => Text("Naziv dokumenta je ${e.label}")).toList(),

answered Sep 21, 2022 at 7:12

Sugan Pandurengan

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1 Comment

Ranko Koturic Over a year ago

When I try it I get error: "The element type 'List<Widget>' can't be assigned to the list type 'Widget'"

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