Question

how to write the sql bellow to django model sql language ?

select id,author_id from forum_node as answer_node where node_type='answer' and 
'android' in  (select tagnames from forum_node as question_node where
id=answer_node.parent_id );

could any one give help

Answer 1

Hard to say exactly without seeing you model classes, but selecting the relevant Forum_Node objects will look something like this:

Forum_Node.objects.filter(
    node_type="answer", 
    parent__tagnames__name__in=['android']
)

Or, to get just the id and author_id:

Forum_Node.objects.filter(
    node_type="answer", 
    parent__tagnames__name__in=['android']
).values_list('id', 'author_id')