Works, unless you want to allow users to edit their entries. If a user changes the address after submitting then the new key is now different and you'll end up saving a second entity. I wouldn't use any user editable data in the key. Instead, I'd add a separate column to include your hash.
On Tue, Sep 6, 2011 at 11:32 PM, Robert Kluin <[email protected]>wrote: > Hi Thomas, > If you want to avoid duplicates, the hash solution is great. > Generate the hash, then In a transaction try to fetch the entity by > id. If you can't get it, insert it. > > > Robert > > > > > > > On Tue, Sep 6, 2011 at 21:16, Thomas Wiradikusuma > <[email protected]> wrote: > > Hi guys, > > > > I'm working on something like AirBnB but much simpler. I want to hint > > user whenever he/she tries to submit duplicate entry. > > > > Currently, my model looks like: > > > > House { > > Id > > Username > > Address > > State > > Country > > } > > > > The id is made of address+state+country MD5. Is this the "correct" way > > to do it? Or, should I go with auto-generated Id and add extra field > > named 'hash', or how? > > > > > > > > > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > [email protected]. > > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
