Hi Massimo, this new functionality is great!! How will be the syntax for the Mirek use case? And what if we have something like invoice_item >- product >- product_group >- group_thing ? And more and more and more?
Greetings.
El lunes, 11 de julio de 2016, 2:01:19 (UTC-4), Massimo Di Pierro escribió:
>
> 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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