yes. you can do that.
On Thursday, 7 July 2016 05:31:30 UTC-5, Mirek Zvolský wrote:
>
> 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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