In queries and cursors limitation

[Rajesh Gupta]

I have the following 

Public class Invoice {

  @Id Long id

   Key<Party> partyKey;

   Status status

}

enum Status {

  PAID, PARTIAL_PAID, PENDING, DRAFT

}

I want to find all invoices with Status = PAID, PARTIAL_PAID, so I do the IN query

ofy.query(Invoice.class).filter("status in", [PAID, PARTIAL_PAID]).limit(100).list()

However, then, if I want the next 100, the cursor will not work because of IN query

What are the alternate solutions or schemas'.

--

Regards,

Rajesh

www.VeersoftSolutions.com

www.GainERP.com

Accounting/Inventory/Orders/Sales/Purchase on Google Cloud Platform and Mobile

[Jason Collins]

Add a new field called, e.g, queryableStatus that is a list of strings. Then pre-compute your query logic so that you only need an equality filter.

E.g, when saving the entity (warning: pseudocode ahead):

  if status in ['PAID', 'PARTIALLY_PAID']:

    invoice.queryableStatus.append('PAID_OR_PARTIALLY_PAID')

  # you can have all sorts of logic combinations and tags appended, if you need them

  invoice.save()

Then. when you query, you can use an equality:

  ofy.query(Invoice.class).filter("status =", ['PAID_OR_PARTIALLY_PAID']).limit(100).list()

This will let the cursor work as expected.

Of course, you'll have to one-time update all your existing invoices. And you'll need to one-time update all your existing invoices whenever your QueryableStatus logic changes.

[Rajesh Gupta]

The suggestion looks good.  thanks.

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