FormEncode validate：用逗号分隔的词

Question

如何验证FormEncode用逗号分隔的单词？

事情是这样的：

"foo1, foo2, foo3" -> ["foo1", "foo2", "foo3"] 

Answer 1

您可能需要一个custom validator。这里有一个简单的例子：

import formencode 

class CommaSepList(formencode.validators.FancyValidator): 

    def _to_python(self, value, state): 
     return value.split(",") 

    def validate_python(self, value, state): 
     for elem in value: 
      if elem == "": 
       raise formencode.Invalid("an element of the list is empty", value, state) 

>>> CommaSepList.to_python("1,2,3") 
['1', '2', '3'] 
>>> CommaSepList.to_python("1,,") 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/usr/lib64/python2.5/site-packages/FormEncode-1.2.3dev-py2.5.egg/formencode/api.py", line 416, in to_python 
    vp(value, state) 
    File "myValidator.py", line 17, in validate_python 
    raise formencode.Invalid("an element of the list is empty", value, state) 

当然，你会想添加特定于你的用例的验证。

Answer 2

假设每个字由一个逗号和空格（', '）分隔：

>>> x = "foo1, bar2, foo3" 
>>> x.split(', ') 
['foo1', 'bar2', 'foo3'] 

然后再传递到FormEncode该列表，并将它做什么你需要它来做。