Python getattr, howto address the constructor of a django model

Question

In the code below I render the person model. Instead of person() I want to use a getattr to make use of a variable model name. Something like getattr('person', ????) The code below is a simplified verdion of my app engine code.

class person(djangoforms.ModelForm):

    name = djangoforms.forms.CharField(max_length=24, min_length=2, label = 'Name', required = True)


class MainPage(webapp.RequestHandler):

    def get(self):

    path = os.path.join(os.path.dirname(__file__), 'templates', 'person.html')
    self.response.out.write(template.render(path, {'form' : person(), 'name' : 'voscausa'}))

Yes, I was looking for somtehing like that. I have already tried the '__init__'. It returns an error: ERROR 2011-03-24 14:45:26,290 __init__.py:395] 'method-wrapper' object is not iterable — voscausa, Mar 24 '11 at 14:52

score 0 · Answer 1 · edited May 23 '17 at 12:23

0

The constructor of a python class is named __init__, so use getattr(YourClass, '__init__').

However, this is probably not what you want. See Does python have an equivalent to Java Class.forName()? - this might be the solution for your question.

edited May 23 '17 at 12:23

Community

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answered Mar 24 '11 at 14:24

ThiefMaster

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I have tried to implement the second part of your answer. adding the the function you suggested : def get_class( kls ): parts = kls.split('.') module = ".".join(parts[:-1]) m = __import__( module ) for comp in parts[1:]: m = getattr(m, comp) return m But this gives : TypeError: 'ModelFormMetaclass' object is not iterable – voscausa Mar 24 '11 at 15:03

score 0 · Answer 2 · edited Dec 28 '15 at 00:55

0

I used

get_class('main.person')()

instead of

get_class('main.person')

to get

self.response.out.write(template.render(path, {'form' : get_class('main.person')(), 'name' : 'voscausa'}))

edited Dec 28 '15 at 00:55

worldofjr

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answered Mar 24 '11 at 15:11

voscausa

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score 0 · Answer 3 · answered Mar 24 '11 at 16:34

0

try:
    globals()[model_name]()
except KeyError:
    print "hey, you forgot to define %s"%model_name

answered Mar 24 '11 at 16:34

vartec

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Python getattr, howto address the constructor of a django model

3 Answers3