Re: [web2py] Re: default usage
a, i got it, thank you so much for your detail explaination and example,
villas.
On Sun, May 15, 2011 at 5:27 PM, villas villa...@gmail.com wrote:
It is simply how that record id will be displayed when used in a
foreign key.
e.g.
table colors:
id: 1, name: red,
id: 2, name: yellow,
table cars:
id: 1, descr: sport, color_id: 1
When you create a form for 'cars', how would you like the color_id
field to appear?
a) a drop-down box showing id numbers 1,2
b) a drop-down box showing red, yellow
Most people would say b). Therefore they use record representation to
enable this to happen automatically.
db.define_table('colors', Field('name'), format='%(name)s')
On May 15, 5:39 am, pbreit pbreitenb...@gmail.com wrote:
I still don't understand Record Representation. Is there a plain english
description or, better, examples of what it actually does?
Re: [web2py] Re: default usage
i'm understand right now, thank you so much for your detail explaination. On Sun, May 15, 2011 at 5:02 AM, Anthony abasta...@gmail.com wrote: On Saturday, May 14, 2011 5:37:39 PM UTC-4, 黄祥 wrote: hi, is there anyone can explain about the usage of default? e.g. on http://web2py.com/book/default/chapter/03#Adding-CRUD db.comment.image_id.default = image.id You can read about it here: http://web2py.com/book/default/chapter/06#Record-Representation It sets the default value for a field for when an insert is done without specifying any value, and it is also used to pre-populate SQLFORM fields. You can specify it when you define your table, but you can also change it at other points in your code (e.g., you may specify a default where the table is defined in your model file, but then later change the default in a controller function). In the example above, it looks like it's being used to pre-populate the crud form with the currently selected image. Anthony
