子孙中的web2py表示形式“格式" [英] web2py representation 'format' in grandchild
问题描述
问题解答(和文档)描述了define_table函数的format=
参数的使用.我在使它在稍微复杂一些的情况下工作时遇到问题.我正在使用web2py版本(1, 99, 7, datetime.datetime(2012, 3, 4, 22, 12, 8), 'stable')
和Python 2.5.4
. (我使用的是MySQL,但我认为这无关紧要.)
The q&a here (and the doc) describe the use of the format=
argument to the define_table function. I have a problem getting that to work in a slightly more complicated case. I'm using web2py version (1, 99, 7, datetime.datetime(2012, 3, 4, 22, 12, 8), 'stable')
, and Python 2.5.4
. (I'm using MySQL, but I assume that's irrelevant.)
我有以下内容:
独立"(不是子级)表Institution
和Person
.表Team
是Institution
的子级.表Team_staff
将Person
和Team
连接在一起.这是修剪后的版本:
'Independent' (not a child) tables Institution
and Person
. Table Team
is a child of Institution
. Table Team_staff
connects Person
and Team
together. Here's a trimmed version:
db.define_table('Person',
Field('First_name', 'string', length=60, required=True),
Field('Last_name', 'string', length=60, required=True),
...
format='%(First_name)s %(Last_name)s')
db.define_table('Institution',
Field('Institution_name', 'string', length=60, required=True,
unique=True),
format='%(Institution_name)s')
db.define_table('Team',
Field('Institution', db.Institution),
Field('Sex', 'string', required=True,
requires=IS_IN_SET(['m', 'f'])),
Field('Level', 'string', required=True),
...
format='%(Institution)s %(Sex)s')
db.define_table('Team_staff',
Field('Team', db.Team),
Field('Team_staff_member', db.Person),
...
Field('Team_position', 'string', required=True))
到目前为止,太好了.我有一个创建SQLFORM(db.Team_staff)
的控制器,以及一个仅显示表单的视图.当我下拉团队"下拉列表时,我看到机构 id 与性别"值(例如1 f
,然后是其下的1 m
,然后是2 f
,等等)串联在一起向前).由于Institution
具有format='%(Institution_name)s'
,为什么我看不到机构名称而不是机构ID?
So far, so good. I have a controller that creates a SQLFORM(db.Team_staff)
, and a view that simply displays the form. When I drop down the 'Team' dropdown, I see the Institution id concatenated with the 'sex' value (such as 1 f
, then 1 m
below that, then 2 f
, and so forth). As Institution
has format='%(Institution_name)s'
, why am I not seeing the institution name instead of the institution id?
推荐答案
"format"属性不会以这种方式在表之间传播.相反,您应该能够将格式"属性定义为lambda函数,该函数将表的一行作为参数:
The "format" attribute does not propagate across tables that way. Instead, you should be able to define the "format" attribute as a lambda function, which takes a row of the table as its argument:
db.define_table('Team', ...,
format=lambda r: '%s %s' % (db.Institution[r.Institution].Institution_name,
r.Sex))
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