Clear!
On Sun, Apr 26, 2009 at 9:16 PM, Yarko Tymciurak <[email protected]> wrote:
> There is a piece here that is dense, has caused some confusion and deserves
> a comment:
>
> On Sun, Apr 26, 2009 at 1:32 PM, DolleDries <[email protected]>
> wrote:
>>
>> Given the model for web2py-wiki:
>>
>>
>> db.define_table('tag',
>> db.Field('name'))
>>
>> db.tag.name.requires=IS_NOT_EMPTY()
>>
>> db.define_table('page',
>> db.Field('uuid',length=128,writable=False,default=str(uuid.uuid4
>> ())),
>> db.Field('title'),
>> db.Field('menu',length=128),
>> db.Field('public','boolean',default=False),
>> db.Field('active','boolean',default=True),
>> db.Field('body','text'),
>> # db.Field('tags','text'),
>
> # yarko prefers more "explicit" naming:
>
> db.Field("tag_ids, 'text'),
>
> # note: id's == multiple references;
> # it's defined as text but holds a string of foreign keys, '|12|14|22|'
> # this _could_ be done as a one-to-many table entry, eg: keys: field -
> page; field - tag
> # but this '|1|2|3|' is web2py implementation, an efficiency for when
> this won't hold too many
> # not sure what the trade off point is (Massimo could comment)
> # ... perhaps a 1000 keys would do better with a separate table???
>>
>> db.Field('created_by',db.auth_user,default=who,writ#able=False),
>> db.Field('created_on','datetime',default=now,writable=False))
>>
>> db.page.title.requires=IS_NOT_EMPTY()
>> db.page.tags.requires=IS_IN_DB(db,'tag.id','%(name)s',multiple=True)
>>
>>
>> Can somebody explain to to me what is meant by the last line???
>>
>> It seems to me this line has a diffenrent meaning: db.Field
>> ('tags','text').
>> I believe it should be somthing like: db.Field('tags', db.tag) or
>> perhaps a SET or ENUM of tags...
>>
>> Put how is that produced dynamicly? Haven't found anything in the book
>> or API yet..
>>
>>
>
>
> >
>
--
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Andre van der Vlies <[email protected]>
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Homepage: http://vandervlies.xs4all.nl/~andre
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