I'm trying to improve ch 6 in the book, DAL.
The on_define parameter to define_table is not documented.
This is my current text, but the example concerns me because it seems
redundant to me. That is, until I found the example, I thought that adding
such simple requires settings via Field definitions would still leave the
table lazily defined.
on_define
on_define is a callback triggered when a lazy_table is instantiated,
although it is called anyway if the table is not lazy. This allows dynamic
changes to the table without losing the advantages of delayed instantiation.
Example:
db = DAL(lazy_tables=True)
db.define_table('person',Field('name'),Field('age','integer'),
on_define=lambda table: [
table.name.set_attributes(requires=IS_NOT_EMPTY(),default=''),
table.age.set_attributes(requires=IS_INT_IN_RANGE(0,120),default=30),
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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