如何从字典填充StructuredProperty？

Question

在StructuredProperty上没有populate方法（如ndb.Model上的populate方法），那么如何从dict中填充这些字段？

Answer 1

You can still populate the StructuredProperty .

If you have models like this:

class A(ndb.Model):
  value = ndb.IntegerProperty()

class B(ndb.Model):
  name = ndb.StringProperty()
  a = ndb.StructuredProperty(A)

The following will populate the properties of both:

my_dict = {"name":"my name", "a":{"value":1}}
b = B()
b.populate(**my_dict)

You can also call populate on the property:

my_dict = {"value":1}
b = B()
b.a = A()
b.a.populate(**my_dict)

Note that what is returned by the getter is not the StructuredProperty instance. It is an instance of A . So calling populate works.