Check of property type in Google App Engine model

Is it possible to detect the type of a model property?

class MODULENAME(db.Model):
    id1 = db.StringProperty()
    id2 = db.StringProperty()
    id3 = db.StringProperty()
    property1 = db.StringProperty()
    property2 = db.Strin开发者_Go百科gProperty()
    createdate = db.DateProperty(auto_now_add=True)
    changedate = db.DateProperty(auto_now_add=True)
    isactive = db.BooleanProperty()

How do I test if "id3" is an int, float or a string?

I've learned so far that a model have a method called "_all_propertie" that returns a list with all the properties I've created in the model. Now I want to check for the property type so I can make the form automatically with te correct html input types and if I change the property type, the HTML will change automatically.

Does that make sense or am I too far off track?

/Michael

Working code:

from google.appengine.ext import db

class MODULENAME(db.Model):
    id1 = db.StringProperty()
    id2 = db.StringProperty()
    id3 = db.DateProperty()
    property1 = db.StringProperty()
    createdate = db.DateProperty(auto_now_add=True)
    changedate = db.DateProperty(auto_now_add=True)
    isactive = db.BooleanProperty()

m = MODULENAME()
plist = m.properties()
for p in plist:
    print "%s: %s" % (p, str(plist[p]))

Thanks, for the clues Daniel Roseman and Nick Johnson.

You don't want to use _all_properties, since that just gives you the names of the fields as a set of strings.

Instead, you can use _properties, which gives you a dictionary of field name to field type. Each of the field types, in turn, as a property called data_type, which as the name implies is the type of the data it accepts.

So:

id3 = ModelName._properties['id3']
data_type = id3.data_type

Now data_type contains type <int>.

Try this:

for name, property in MyModel.properties().items():
    print "Name: " + name + "; Type: " + str(property.data_type)

As Nick Johnson pointed out, _properties and _all_properties should not be used as they are internal and liable to change.