Populating a parent field dynamically in Dart

dart, dart-mirrors

Solution

You should use a `ObjectMirror` to set a field on your object. Your code tries to set a field on `ClassMirror` which tries to define a static variable.

class Resource {
  String name;
  String description;

  Resource.map(Map data)
  {
    ObjectMirror o = reflect(this);  // added
    ClassMirror c = reflectClass(runtimeType);
    ClassMirror thisType = c;
    while(c != null)
    {
      for (var k in c.declarations.keys) {
        print('${MirrorSystem.getName(k)} : ${data[MirrorSystem.getName(k)]}');
        if(data[MirrorSystem.getName(k)] != null)
        {
          // replace "thisType" with "o"
          o.setField(k, data[MirrorSystem.getName(k)]);
        }
      }
      c = c.superclass;
    }
  }
}

class Skill extends Resource
{
  Skill.map(data) : super.map(data);
}

Problem

I'm creating objects dynamically from Map data, populating fields for matching key names. The problem comes when fields are defined on the parent, where attempting to set a value on a parent field produces the error: ``` No static setter 'name' declared in class 'Skill'. NoSuchMethodError : method not found: 'name' ``` code: ``` class Resource { String name; String description; Resource.map(Map data) { ClassMirror c = reflectClass(runtimeType); ClassMirror thisType = c; while(c != null) { for (var k in c.declarations.keys) { print('${MirrorSystem.getName(k)} : ${data[MirrorSystem.getName(k)]}'); if(data[MirrorSystem.getName(k)] != null) { thisType.setField(k, data[MirrorSystem.getName(k)]); } } c = c.superclass; } } } class Skill extends Resource { Skill.map(data) : super.map(data); } ```

Original source

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