Missed file

flask_admin/contrib/mongoengine/subdoc.py

+from flask.ext.admin._compat import iteritems
+from flask.ext.admin.model.form import InlineBaseFormAdmin
+
+
+class EmbeddedForm(InlineBaseFormAdmin):
+    def __init__(self, **kwargs):
+        super(EmbeddedForm, self).__init__(**kwargs)
+
+        self._form_subdocuments = convert_subdocuments(getattr(self, 'form_subdocuments', {}))
+
+
+def convert_subdocuments(values):
+    result = {}
+
+    for name, p in iteritems(values):
+        if isinstance(p, dict):
+            result[name] = EmbeddedForm(**p)
+        elif isinstance(p, EmbeddedForm):
+            result[name] = p
+        else:
+            raise ValueError('Invalid subdocument type: expecting dict or instance of flask.ext.admin.contrib.mongoengine.EmbeddedForm, got %s' % type(p))
+
+    return result