How to define a user defined MessageField like DateTimeField

[tevin joseph]

Hi,

I would like to create a user defined MessageField like DateTimeField. I have created one as follows:

class ErrorMessage(Message):

    code = StringField(1, required=True)

    message = StringField(2, required=True)

    reference = StringField(3, required=True)

class ErrorField(MessageField):

    message_type = ErrorMessage

    @util.positional(3)

    def __init__(self, number, **kwargs):

        super(ErrorField, self).__init__(self.message_type, number, **kwargs)

Is it sound right? I have used this ErrorField  as one of the field in response class of Google cloud endpoints. It works well with JS client but when used with android, error object  gets in the format error="".  Thanks in advance.

         return  MyResponse(

            isSaved=False,

            error=ErrorMessage(code="200", message=simplejson.dumps(form.errors), reference="form validation error")

           )

         from protorpc.messages import Message, StringField, MessageField

         class MyResponse(Message):
            isSaved = StringField(1, required=True)
            error = ErrorField(2, required = False)

[Danny Hermes]

Why do you need this for Cloud Endpoints? Can you post this on Stack Overflow?

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Danny Hermes
Developer Programs Engineer

[tevin joseph]

Hi,

I have posted this on stack overflow. Please advice.

Thanks,

Tevin

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[alex]

(CCing google-appengine).

Here's another usecase for custom message field:

from google.appengine.datastore.datastore_query import Cursor

class CursorMessage(messages.Message):

  encoded = messages.StringField(1)

class CursorField(messages.MessageField):

  message_type = CursorMessage

  def value_from_message(self, message):

    """Converts CursorMessage to a datastore_query.Cursor."""

    return Cursor(urlsafe=message.encoded)

  def message_from_value(self, value):

    """Converts datastore_query.Cursor to a CursorMessage."""

    return CursorMessage(encoded=value.urlsafe())

What do you guys think, makes sense?

Thanks,

Alex.

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