CODEWITHSUNDEEP
pythondjangoformssession
Steven Meesters
Steven Meesters

Reputation: 69

Django forms Choicefield parameter session key

I am working on a project which bases operations on the session_key parameter.

I would like to fetch data from the database and add the variables into a choicefield in forms. Using the ModelChoiceField(queryset=..., empty_label="(Nothing)") could be an option, but i still cant take in the session_key as a parameter to filter the queryset.

so my question, how can i fetch the session_key from the request in views and pass it to the queryset in the forms class?

Thx!

UPDATE:

FORM:

class CreateChartForm(forms.Form): def init(self, var_list, *args, **kwargs): super(CreateChartForm, self).init(*args, **kwargs) self.fields['x'] = forms.ChoiceField(choices=tuple([(name, name) for name in var_list])) self.fields['y'] = forms.ChoiceField(choices=tuple([(name, name) for name in var_list]))

But now i cannot pass REQUEST.POST to the form...

form = CreateChartForm(var_list=df.columns.to_list())

Upvotes: 0

Views: 41

Answers (2)

Steven Meesters
Steven Meesters

Reputation: 69

Okay now i have been using the "trial and error" methods and a big selection of questions here on Stack.

IF you want to dynamically create choicefields from a django model without using the modelform you can get it via *args and *kwargs.

I modified my Form as below in FORMS.py:

class CreateChartForm(forms.Form):

def __init__(self, *args, **kwargs):
    super(CreateChartForm, self).__init__(*args, **kwargs)
    req, cols = args
    self.fields['x'] = forms.ChoiceField(choices=tuple([(name, name) for name in cols]))
    self.fields['y'] = forms.ChoiceField(choices=tuple([(name, name) for name in cols]))


CHART_CHOICES = (
    ("Linjediagram", "Linjediagram"),
    ("Stapeldiagram", "Stapeldiagram"),
    ("Korrelationsgraf", "Korrelationsgraf"),
    ("Kaka", "Kaka"),
)

chart = forms.ChoiceField(choices=CHART_CHOICES)
titel = forms.CharField(max_length=255)

Then i passed both the request.POST and the dataframe.columns.to_list() in the VIEWS.py file:

    form = CreateChartForm(request.POST, df.columns.to_list())

Now i have a form which can access dynamic variable names through a Pandas Dataframe and adding them to a drop down style choice field in a form :-)

Upvotes: 0

nigel222
nigel222

Reputation: 8192

The terms you probably want to search are "Django" and "dynamic ChoiceField".

I don't have an example to hand, but this question seems to have answers pretty much as I would have guessed.

Upvotes: 0

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