Massimo, this is great ! >From your second example I think, it could work for serial m:1 joins too. Example: invoice_item >- product >- product_group If I want list invoice_items with product.name + with product_group.name
Realy is this now possible?
Dne úterý 5. července 2016 20:20:06 UTC+2 Massimo Di Pierro napsal(a):
>
> db = DAL()
>
> db.define_table('person',Field('name'))
>
> db.define_table('thing',Field('name'),Field('owner','reference person'))
>
>
> for name in ('Max','Tim','Jim'):
>
> i = db.person.insert(name=name)
>
> for thing in ('Chair','Table','Bike'):
>
> db.thing.insert(owner=i, name=name+"'s "+thing)
>
>
> rows = db(db.thing).select().join(db.person.id)
>
> print(rows.as_json())
>
>
> """
>
>
>
> [{"owner": {"id": 1, "name": "Max"}, "id": 1, "name": "Max's Chair"},
>
>
>
> {"owner": {"id": 1, "name": "Max"}, "id": 2, "name": "Max's Table"},
>
>
>
> {"owner": {"id": 1, "name": "Max"}, "id": 3, "name": "Max's Bike"},
>
>
>
> {"owner": {"id": 2, "name": "Tim"}, "id": 4, "name": "Tim's Chair"},
>
>
>
> {"owner": {"id": 2, "name": "Tim"}, "id": 5, "name": "Tim's Table"},
>
>
>
> {"owner": {"id": 2, "name": "Tim"}, "id": 6, "name": "Tim's Bike"},
>
>
>
> {"owner": {"id": 3, "name": "Jim"}, "id": 7, "name": "Jim's Chair"},
>
>
>
> {"owner": {"id": 3, "name": "Jim"}, "id": 8, "name": "Jim's Table"},
>
>
>
> {"owner": {"id": 3, "name": "Jim"}, "id": 9, "name": "Jim's Bike"}]
>
>
>
> """
>
>
>
> rows = db(db.person).select().join(db.thing.owner, name="owns", fields=[
> db.thing.id, db.thing.name])
>
> print(rows.as_json())
>
>
> """
>
>
>
> [{"id": 1, "name": "Max", "owns": [
>
>
>
> {"id": 1, "name": "Max's Chair"},
>
>
>
> {"id": 2, "name": "Max's Table"},
>
>
>
> {"id": 3, "name": "Max's Bike"}]},
>
>
>
> {"id": 2, "name": "Tim", "owns": [
>
>
>
> {"id": 4, "name": "Tim's Chair"},
>
>
>
> {"id": 5, "name": "Tim's Table"},
>
>
>
> {"id": 6, "name": "Tim's Bike"}]},
>
>
>
> {"id": 3, "name": "Jim", "owns": [
>
>
>
> {"id": 7, "name": "Jim's Chair"},
>
>
>
> {"id": 8, "name": "Jim's Table"},
>
>
>
> {"id": 9, "name": "Jim's Bike"}]}
>
>
>
> ]
>
>
>
> """
>
>
> this is designed to be efficient and work on GAE too as long as rows is
> not too long.
>
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