如何将 id 转换为 Web2py 中的引用字段? [英] How to convert id into referenced field in Web2py?

问题描述

考虑下面的 3 个表 (A, B & C)，其中表 C 有 2 个字段参考表 A 和 B.

Consider the 3 tables below (A, B & C) where table C has 2 fields referenced to table A and B.

型号:

db.define_table('A',
Field('A1', 'string', required =True),
Field('A2', 'string', required =True),
Field('A3', 'string', required =True),
format=lambda r: '%s, %s' % (r.A.A1, r.A.A2))

db.define_table('B',
Field('B1', 'string', required=True),
Field('B2', 'string', required=True),
Field('B3', 'string', required=True),
format=lambda r: '%s, %s' % (r.B.B1, r.B.B2))

db.define_table('C',
Field('C1', db.A),
Field('C2', db.B),
Field('C3', 'string', required=True),
format=lambda r: '%s, %s - %s' % (r.C.C1, r.C.C2))

控制器:

def C_view():
    if request.args(0) is None:
        rows = db(db.C).select(orderby=db.C.C1|db.C.C2)
    else:
        letter = request.args(0)
        rows = db(db.C.C1.startswith(letter)).select(orderby=db.C.C1|db.C.C2)
    return locals()

在下面的相应视图中，我显示了表 C 的 3 个字段:

In the corresponding view below I display the 3 fields of table C:

...
{{ for x in rows:}}
    <tr>
        <td>{{=x.C1}}</td>
        <td>{{=x.C2}}</td>
        <td>{{=x.C3}}</td>
    </tr>
{{pass}}
...

通过此设置，视图显示 C1 & 的外部 ID.C2.我将如何修改模型、控制器和/或视图以显示相应的参考字段而不是 ID?换句话说:对于 C1 视图应该显示 rAA1, rAA2 而对于 C2 视图应该显示 rBB1, rBB2>.

With this setup, the view displays the foreign id of C1 & C2. How would I have to modify the model, controller and/or the view to display the corresponding reference fields rather than the id's? In other words: for C1 the view should display r.A.A1, r.A.A2 and for C2 the view should display r.B.B1, r.B.B2.

谢谢.

推荐答案

你需要正确使用format: Record representation 并使用 render()code> 将 id 转换为它们各自的表示形式.

You need to use format: Record representation correctly and use render() to convert ids into their respective representation.

您的模型将如下所示:

db.define_table('A',
                Field('A1', 'string', required=True),
                Field('A2', 'string', required=True),
                Field('A3', 'string', required=True),
                format='%(A1)s, %(A2)s')

db.define_table('B',
                Field('B1', 'string', required=True),
                Field('B2', 'string', required=True),
                Field('B3', 'string', required=True),
                format='%(B1)s, %(B2)s')

db.define_table('C',
                Field('C1', db.A),
                Field('C2', db.B),
                Field('C3', 'string', required=True))

并更新控制器并使用render().render() 返回一个生成器来迭代所有行.

And update controller and use render(). render() returns a generator to iterate over all rows.

def C_view():
    if request.args(0) is None:
        rows = db(db.C).select(orderby=db.C.C1|db.C.C2).render()
    else:
        letter = request.args(0)
        rows = db(db.C.C1.startswith(letter)).select(orderby=db.C.C1|db.C.C2).render()
    return locals()

参考:

使用表示呈现行

格式: 记录表示

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