rendering foreign keys as a pulldown in web2py app

问题:

part of my web2py database schema looks like so:

db.define_table('asset',
    Field('name', unique=True, requires=IS_NOT_EMPTY()),
    Field('description', 'text')
)

db.define_table('wallet',
    Field('name', unique=True, requires=IS_NOT_EMPTY()),
    Field('description', type='text')
)

db.define_table('wallet_asset',
    Field('wallet_id', 'reference wallet'),
    Field('asset_id', 'reference asset')
)

When I visit appadmin to enter a new wallet_asset record, I would like for the wallet_id and asset_id fields to be pulldowns that render the names of those referenced tables.

How do I do this?

回答1:

Use format record representation at the time of defining tables.

Read format: Record representation

Your schema will look like this:

db.define_table('asset',
    Field('name', unique=True, requires=IS_NOT_EMPTY()),
    Field('description', 'text'),
    format='%(name)s'
)

db.define_table('wallet',
    Field('name', unique=True, requires=IS_NOT_EMPTY()),
    Field('description', type='text'),
    format='%(name)s'
)