http://code.google.com/appengine/articles/update_schema.html
So I thought I was ready for this ... but!!
I had added a new field like this:
@Persistent
private int sortorder;
And got this error whatever I did:
This property is mapped to FIELD, which cannot accept null values.
So I changed my field definition to:
@Persistent
private Integer sortorder;
Now I could loop the records in my table and assign default values, because now null is accepted!
Puh ...
2 comments:
You got this error :
"This property is mapped to FIELD,"
It is because "int" :
@Persistent
private int sortorder;
is a primitive data type and thus cannot point to a null values,
whereas "Integer" :
@Persistent
private Integer sortorder;
is an Object and only objects (i.e String,Integer,Double etc..) can point to a null reference.
Hope that helps.
Ramon
well yes I did get that - but the problem is that in the when I go to the Dashboard in app engine and try the Datastore viewer - I will get a "Server Error -
A server error has occurred."
after an update with int's it class.
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