Changing StringProperty to TextProperty

[johnP]

Hi -

I have a bunch of records with a StringProperty field. I do not need
them indexed, and now I need to allow users to add more than 500
characters. So I need to migrate these records to TextProperty.

In the dev datastore, simply switching the property in Models does not
show any obvious errors. Is it safe to make such a switch on
production? Or are there possible land-mines I'm not considering?

Thanks for any assistance.

johnP

[Waleed Abdulla]

Bump. I was about to post the same question. Is it safe to change the type of a model property from string to text? 

Waleed

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[Nick Johnson (Google)]

Yes, it's always safe to switch from StringProperty to TextProperty. Existing records will remain indexed until you get and put them again, but they will work as expected.

-Nick Johnson

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Nick Johnson, Developer Programs Engineer, App Engine
Google Ireland Ltd. :: Registered in Dublin, Ireland, Registration Number: 368047

[timh]

You will need to truncate any TextProperty to <=500 bytes.

Some Potential Approaches 

1. Create a new StringProperty in parallel to the existing TextProperty and gradually rewrite objects truncating as you go.

2. Fetch objects using raw datastore access  (no models involved) and truncate and rewrite them then just update your class definition.

 

On Tuesday, April 30, 2013 2:44:35 PM UTC+8, Hai Bison wrote:

Hi Nick,

How about the opposite way? I mean, is switching from TextProperty to StringProperty safe? Thank you in advance.

Hai