Django: filtering models on the difference of Counts of related models -

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I've got a bunch of order objects, each one or more orderreaves are associated with objects (as their reverse relation Appearance order.order_oroz.all ()) with parent order.

Each order has a collection_states attribute, which can be 'collected', 'recalls' or a bunch of other special values. Each order has a status attribute, one of the valid values ​​for 'processing'.

I'm on the loss in trying to create an order query set which lists the following objects Criteria: The status of the order is 'processing', its archive_stateus = 'calculation' calculated * < / Code> Orders are less than the total number of their orders

To keep it explicit:

Order with two rows, both 'unlocked': included in the QS- order With three rows, one 'collected', two 'Ricolte' 'Include: QS
order with two lines, both "collect": QS not included!

(You can replace 'unselected' with any other value which is not 'collected' and the criteria still is the same, it 'collected' vs. any other collection_stats).

I did as far as the order was given. Object. Filters (status_exact = 'processing'), but besides this, annotations, Q () objects etc. have failed miserably in all my efforts.

I read your question again at least 30 times. Let me see that I understand what you want.

This will not work because no order order will be made with crawling_states == 'collected' 

  order

something else Try 

  Order = Order. Objects (order- 'processing'). Exit (order_row__collection_status = 'collected')  in order for the filter (condition = 'processing') arr = []: col = order.order_rows.filter (collection_status = 'collected') if the col.count ( ) & Lt; Order.order_rows.all () Count (): arr.append (order.pk) order = orders.filter (pk__in = arr)

to just clear

its archive_Status = 'Assembled' orderers are less than the total number of your orders

After reading your question for a 31st time, it seems that the total number of OrderRows is always in any order > Can be> = 'collected' number of orderers

Should an order with 29 rows, 14 are collected and 15 others should be included? What are the orders with 29 rows, 15 collected and 14 other?


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